Projects

SOIL MANAGEMENT FOR ENHANCED AGRICULTURAL PRODUCTIVITY AND SUSTAINABLE BIOFUEL FEEDSTOCK PRODUCTION Appropriated (D)   Accession Number: 421460

IMPLEMENTATION OF SUSTAINABLE BIOENERGY PRODUCTION SYSTEMS Nonfunded Cooperative Agreement (N)   Accession Number: 420995

REGIONAL CORN STOVER REMOVAL IMPACT STUDY - AMES (II) Reimbursable (R)   Accession Number: 421875

SUSTAINABLE PRODUCTION AND DISTRIBUTION OF BIOENERGY FOR THE CENTRAL USA Reimbursable (R)   Accession Number: 422917

Publications (Clicking on the reprint icon will take you to the publication reprint.)

Fluid fertilizer's role in sustaining soils used for bio-energy feedstock production - (Proceedings) - (15-Apr-13)

A soil quality assessment of a Vertisol after 57 years of agricultural and pasture management - (Peer Reviewed Journal)

Stott, D.E., Karlen, D.L., Harmel, R.D., Cambardella, C.A. 2013. A soil quality assessment of a Vertisol after 57 years of agricultural and pasture management. Soil Science Society of America Journal. 77(3):903-913. DOI: 10.2136/sssaj2012.0355.

Thirty-year tillage effects on crop yield and soil fertility indicators - (Peer Reviewed Journal)

Karlen, D.L., Kovar, J.L., Cambardella, C.A., Colvin, T.S. 2013. Thirty-year tillage effects on crop yield and soil fertility indicators. Soil & Tillage Research. 130:24-41.

Corn stover management effects on soil organic carbon contents from several U.S. locations - (Abstract Only)

Johnson, J.M., Varvel, G.E., Stott, D.E., Osborne, S.L., Novak, J.M., Karlen, D.L., Lamb, J., Baker, J.M. 2012. Corn stover management effects on soil organic carbon contents from several U.S. locations. Meeting Abstract. [abstract] 2012 Sun Grant Conference. p. 40.

Value of fluid fertilizer in bio-energy production - (Trade Journal)

Kovar, J.L., Karlen, D.L. 2012. Value of fluid fertilizer in bio-energy production. Fluid Journal. 20:6-9.

Distribution of energy content in corn plants as influenced by corn residue management - (Proceedings) - (04-Sep-12)

Distribution of structural carbohydrates in corn plants as influenced by corn residue management - (Abstract Only) - (04-Sep-12)

Landscape management for sustainable supplies of bioenergy feedstock and enhanced soil quality - (Peer Reviewed Journal) - (07-Aug-12)

Corn stover harvest strategy effects on grain yield and soil quality indicators - (Peer Reviewed Journal) - (07-Aug-12)

Revolutionary land use change in the 21st century: Is (rangeland) science relevant? - (Peer Reviewed Journal)

Herrick, J.E., Brown, J., Bestelmeyer, B.T., Andrews, S., Baldi, G., Duniway, M., Havstad, K.M., Karl, J.W., Karlen, D.L., Peters, D.C., Quinton, J.N., Riginos, C., Shaver, P.L., Twomlow, S. 2012. Revolutionary land use change in the 21st century: Is (rangeland) science relevant?. Rangeland Ecology and Management. 65:590-598.

Influence of corn stover harvest on soil quality assessments at multiple locations across the U.S. - (Proceedings) - (12-Jun-12)

Fluid fertilizer's role in sustaining soils used for bio-energy feedstock production - (Proceedings)

Kovar, J.L., Karlen, D.L. 2012. Fluid fertilizer's role in sustaining soils used for bio-energy feedstock production. In: Leikam, D.F., editor. Proceedings of the Fluid Fertilizer Foundation Symposium, February 19-21, 2012, Scottsdale, AZ. 29:1-9. Available: http://www.fluidfertilizer.com/fertilizer_forum_proceedings2012.html.

Soil quality assessment: John Doran's challenge and the scientific community response - (Abstract Only)

Karlen, D.L. 2011. Soil quality assessment: John Doran's challenge and the scientific community response. American Society of Agronomy Annual Meetings [abstracts]. ASA-CSSA-SSSA Annual Meeting. Oct. 16-19, 2011, San Antonio, TX. Available: http://www.agronomy.org.

Energy issues affecting corn/soybean systems: Challenges for sustainable production - (Review Article)

Karlen, D.L., Archer, D.W., Liska, A.J., Meyer, S. 2012. Energy issues affecting corn/soybean systems: Challenges for sustainable production. Council for Agricultural Science and Technology Issue Paper. Paper No. 48. Available: http://www.cast-science.org/publications/?energy_issues_affecting_cornsoybean_systems_challenges_for_sustainable_production&show=product&productID=52665.

Crop stubble needs and opportunities - (Popular Publication)

Karlen, D.L. 2011. Crop stubble needs and opportunities. Western Australia No-Till Farmers Association Newsletter (WANTFA). New Frontiers in Agriculture. 19(3):112-115.

Potential soil quality impact of harvesting crop residues for biofuels - (Peer Reviewed Journal)

Karlen, D.L. 2011. Potential soil quality impact of harvesting crop residues for biofuels. Agrociencia Magazine. 15(2):120-127.

The importance of pre-conversion technologies for coupling sustainable bioenergy land use to biomass trade - (Abstract Only)

Muth, Jr., D.J., Hess, J., Karlen, D.L. 2011. The importance of pre-conversion technologies for coupling sustainable bioenergy land use to biomass trade. International Energy Agency Workshop. Available: http://www.bioenergytrade.org/downloads/campinas-workshop-final-program-30.8.pdf.

A five-year assessment of corn stover harvest in central Iowa, USA - (Peer Reviewed Journal)

Karlen, D.L., Birrell, S.J., Hess, J. 2011. A five-year assessment of corn stover harvest in central Iowa, USA. Soil & Tillage Research. 115-116:47-55.

The Birkás influence on international soil management research and education - (Book / Chapter)

Karlen, D.L. 2012. The Birkás influence on international soil management research and education. In: Birkás, M., editor. Soil School: What to learn from and what to teach about soils. Gödöllo, Hungary: Szent Istvan University Press. pp. 145-151.

A soil quality assessment within the Iowa River South Fork Watershed - (Peer Reviewed Journal)

Stott, D.E., Cambardella, C.A., Wolf, R., Tomer, M.D., Karlen, D.L. 2011. A soil quality assessment within the Iowa River South Fork Watershed. Soil Science Society of America Journal. 75:2271-2282.

Stover harvest – Safe and sustainable with good resource management practices - (Trade Journal)

Karlen, D.L., Birrell, S.J. 2011. Stover harvest – Safe and sustainable with good resource management practices. Available: http://www.poet.com/discovery/releases/showRelease.asp?id=274&year=2011&categoryid=0.

Impact of 57 years of management on the soil quality of a Vertisol in Central Texas - (Abstract Only) - (30-Apr-11)

Quality assurance of weather data for agricultural system model input - (Book / Chapter)

Malone, R.W., Meek, D.W., Ma, L., Jaynes, D.B., Nolan, B.T., Karlen, D.L. 2011. Quality assurance of weather data for agricultural system model input. In: Ahuja, L.R., Ma, L., editors. Methods of Introducing System Models into Agricultural Research. Madison, WI: American Society of Agronomy, Crop Science of America and Soil Science Society of America. p. 283-296.

Impact of conservationpractices on soil quality indicators: case study in the Fort Cobb Reservoir watershed, Oklahoma - (Abstract Only)

Steiner, J.L., Starks, P.J., Moriasi, D.N., Stott, D.E., Zobeck, T.M., Karlen, D.L. 2011. Impact of conservation practices on soil quality indicators: case study in the Fort Cobb Reservoir watershed, Oklahoma [abstract]. ASA-CSSA-SSSA Annual Meeting, Fundamental for Life: Soil, Crop, & Environmental Sciences, Oct. 16-19, 2011, San Antonio, Texas. Available: http://a-c-s.confex.com/crops/2011am/webprogram/Paper64797.html.

Fluid fertilizer's role in sustaining soils used for bio-energy feedstock production - (Proceedings)

Kovar, J.L., Karlen, D.L. 2011. Fluid fertilizer's role in sustaining soils used for bio-energy feedstock production. In: Leikam, D.F. (ed). Fluid Fertilizer Foundation Symposium Proceedings. Fluid Fertilizer Forum, Feb. 20-22, 2011, Scottsdale, AZ. Volume 28. Available: http://www.fluidfertilizer.com/fertilizer_forum_proceedings2011.html.

Feedstock and conversion interactions – identifying industry needs - (Book / Chapter)

Karlen, D.L. 2011. Feedstock and conversion interactions – identifying industry needs. In: Braun, R.B., Karlen, D.L., and Johnson, D., editors. Proc. of Sustainable Feedstocks for Advanced Biofuels: A workshop to create regionally specific roadmaps for feedstock supply chains. Atlanta, GA. Soil and Water Conservation Society Proceedings. p. 31-35.

Where to from here? - (Book / Chapter)

Karlen, D.L. 2011. Where to from here? In: Braun, R.B., Karlen, D.L., and Johnson, D., editors. Proc. of Sustainable Feedstocks for Advanced Biofuels: A workshop to create regionally specific roadmaps for feedstock supply chains. Atlanta, GA. Soil and Water Conservation Society Proceedings. p. 376-378.

Unraveling water quality and quantity effects of biofuels production - (Experiment Station)

Karlen, D.L. 2011. Unraveling water quality and quantity effects of biofuels production. In: Rudebusch, L., editor. Getting Into Soil & Water. Soil & Water 2011. Soil and Water Conservation Club. Iowa Water Center at Iowa State University. Ames, IA: Experiment Station Bulletins. p. 36-39.

Estimating soil organic carbon using aerial imagery and soil surveys - (Peer Reviewed Journal)

Gelder, B.K., Anex, R.P., Kaspar, T.C., Sauer, T.J., Karlen, D.L. 2011. Estimating soil organic carbon using aerial imagery and soil surveys. Soil Science Society of America Journal. 75:1821-1828.

Soil health: The concept, its role, and strategies for monitoring - (Book / Chapter) - (05-Jan-11)

Groundwater: Contamination from Nitrogen Fertilizers - (Book / Chapter) - (13-Oct-10)

A landscape vision for integrating industrial crops into biofuel systems - (Abstract Only)

Karlen, D.L. 2010. A landscape vision for integrating industrial crops into biofuel systems. Association for the Advancement of Industrial Crops Conference. Available: http://www.aaic.org/10program.htm#GreenMetricsDivision.

Balancing limiting factors and economic drivers for sustainable midwestern U.S. agricultural residue feedstock supplies - (Peer Reviewed Journal)

Wilhelm, W.W., Hess, J.R., Karlen, D.L., Johnson, J.M., Muth, D.J., Baker, J.M., Gollany, H.T., Novak, J.M., Stott, D.E., Varvel, G.E. 2010. Balancing limiting factors and economic drivers for sustainable midwestern U.S. agricultural residue feedstock supplies. Industrial Biotechnology. 6(5):271-287.

Monitoring soil quality to assess the sustainability of harvesting corn stover - (Peer Reviewed Journal)

Karlen, D.L., Varvel, G.E., Johnson, J.M., Baker, J.M., Osborne, S.L., Novak, J.M., Adler, P.R., Roth, G., Birrell, S. 2010. Monitoring soil quality to assess the sustainability of harvesting corn stover. Agronomy Journal. 103:288–295.

Corn Stover Feedstock Trials to Support Predictive Modeling - (Peer Reviewed Journal)

Karlen, D.L. 2010. Corn Stover Feedstock Trials to Support Predictive Modeling. Global Change Biology-Bioenergy. 2:235-247.

Conservation Considerations for Sustainable Bioenergy Feedstock Production: If, What, Where, and How Much? - (Other)

Johnson, J.M., Karlen, D.L., Andrews, S.S. 2010. Conservation Considerations for Sustainable Bioenergy Feedstock Production: If, What, Where, and How Much? Journal of Soil and Water Conservation Society. 65(4):88A-91A.

Vertical distribution of corn stover dry mass grown at several U.S. locations - (Peer Reviewed Journal)

Wilhelm, W.W., Johnson, J.M., Lightle, D., Karlen, D.L., Novak, J.M., Barbour, N.W., Laird, D.A., Baker, J.M., Ochsner, T.E., Halvorson, A.D., Archer, D.W., Arriaga, F.J. 2011. Vertical distribution of corn stover dry mass grown at several U.S. locations. BioEnergy Research. 4(1):11-21.

Soil Tilth: What every farmer understands but no researcher can define - (Book / Chapter)

Karlen, D.L. 2011. Soil Tilth: What every farmer understands but no researcher can define. In: Glinski, J., Horabik, J., Lipiec, J., editors. Encyclopedia of Agrophysics. Heidelberg, London; New York: Springer Dordrecht. p. 794-798.

Biochar Impact on Nutrient Leaching from a Midwestern Agricultural Soil - (Peer Reviewed Journal)

Laird, D.A., Fleming, P.D., Karlen, D.L., Wang, B., Horton, R. 2010b. Biochar Impact on Nutrient Leaching from a Midwestern Agricultural Soil. Geoderma. 158:436-442.

Impact of Biochar Amendments on the Quality of a Typical Midwestern Agricultural Soil - (Peer Reviewed Journal)

Laird, D.A., Fleming, P.D., Davis, D.D., Horton, R., Wang, B., Karlen, D.L. 2010a. Impact of Biochar Amendments on the Quality of a Typical Midwestern Agricultural Soil. Soil Science Society of America Journal. 158:443-449.

Future testing opportunities to ensure sustainability of the biofuels industry - (Peer Reviewed Journal)

Karlen, D.L., Kerr, B.J. 2012. Future testing opportunities to ensure sustainability of the biofuels industry. Communications in Soil Science and Plant Analysis. 43:(1-2)36-46. DOI:10.1080/00103624.2012.631410.

Soil-test N recommendations augmented with PEST optimized RZWQM simulations - (Peer Reviewed Journal)

Malone, R.W., Jaynes, D.B., Ma, L., Nolan, B., Meek, D.W., Karlen, D.L. 2010. Soil-test N recommendations augmented with PEST optimized RZWQM simulations. Journal of Environmental Quality. 39:1711-1723.

Agriculture and land use issues - (Book / Chapter)

Hess, J.R., Jacobson, J.J., Karlen, D.L., Muth, D.J., Nelson, R.G., Ovard, L.P., Searcy, E.M., Ulrich, T.H. 2010. Agriculture and land use issues. In: Rosillo-Calle, Frank and Johnson, Francis X, editors. Food versus Fuel: An Informed Introduction to Biofuels. London, UK: Zed Books Ltd. p. 86-115.

Optimizing Nutrient Management for Sustainable Bio-energy Feedstock Production - (Trade Journal)

Kovar, J.L., Karlen, D.L. 2010. Optimizing Nutrient Management for Sustainable Bio-energy Feedstock Production. Fluid Journal. 18(3). Available: http://fluidjournal.org/1gsdgfs-S10/S10-A2.pdf

Nutrient removal as a function of corn stover cutting height and cob harvest - (Peer Reviewed Journal)

Johnson, J.M., Wilhelm, W.W., Karlen, D.L., Archer, D.W., Wienhold, B.J., Lightle, D.T., Laird, D.A., Baker, J.M., Ochsner, T.E., Novak, J.M., Halvorson, A.D., Arriaga, F.J., Barbour, N.W. 2010. Nutrient removal as a function of corn stover cutting height and cob harvest. BioEnergy Research. 3:342-352.

High Yields for Enhanced Sustainable Feedstock Production - (Abstract Only)

Karlen, D.L. 2010. High Yields for Enhanced Sustainable Feedstock Production. In: Exploring Pathways Toward a Sustainable, Domestic Bioindustry, Biomass, March 30-31, 2010, Arlington, VA. p. 54.

Is Sulfur Limiting Maize Grown on Eroded Midwestern U.S. Soils? - (Proceedings)

Kovar, J.L., Karlen, D.L. 2010. Is Sulfur Limiting Maize Grown on Eroded Midwestern U.S. Soils? In: Gilkes, R.J. and Prakongkep, N. (ed). Proceedings of the 19th World Congress Soil Science, August 1-6, 2010, Brisbane, Australia. ISBN 978-0-646-53783-2. DVD.

Fluid Fertilizer's Role in Sustaining Soils Used for Bio-fuels Production - (Proceedings)

Kovar, J.L., Karlen, D.L. 2010. Fluid Fertilizer's Role in Sustaining Soils Used for Bio-fuels Production. In: Fluid Fertilizer Foundation Symposium Proceedings. Fluid Fertilizer Forum, Feb. 14-16, 2010, Scottsdale, AZ. 2010 CD-ROM, Volume 27.

Tillage and Residue Management Effects on Semi-Arid Mediterranean Soil Quality - (Peer Reviewed Journal)

Imaz, M.J., Virto, I., Bescansa, P., Enrique, A., Fernandez-Ugalde, O., Karlen, D.L. 2010. Tillage and Residue Management Effects on Semi-Arid Mediterranean Soil Quality. Soil & Tillage Research. 107:17–25.

Watershed-Scale Soil Quality Assessment: Assessing Reasons for Poor Canopy Development in Corn - (Proceedings)

Stott, D.E., Cambardella, C.A., Tomer, M.D., Karlen, D.L. 2010. Watershed-Scale Soil Quality Assessment: Assessing Reasons for Poor Canopy Development in Corn [abstract]. In: Proceedings of the World Congress of Soil Science, August 1-6, 2010, Brisbane, Australia. CD ROM.

Microbial community structure and diversity as indicators for evaluating soil quality - (Review Article)

Sharma, S.K., Aketi, R., Sharma, M.P., Joshi, O., Govaerts, B., Steenwerth, K.L., Karlen, D.L. 2010. Microbial community structure and diversity as indicators for evaluating soil quality. Sustainable Agriculture. 5:317-358.

Indices for soil management decisions - (Book / Chapter)

Karlen, D.L., Wienhold, B.J., Kang, S., Zobeck, T.M., Andrews, S.S. 2011. Indices for soil management decisions. In: Sauer, T.S., Hatfield, J.L., editors. Soil Management: Building a Stable Base for Agriculture. Madison, WI. American Society of Agronomy and Soil Science Society of America, Inc. p. 39-50.

Soil Conditioning Index - (Book / Chapter)

Zobeck, T.M., Norfleet, M.L., Karlen, D.L. 2009. Soil Conditioning Index. In: Lal, R. Encyclopedia of Soil Science. Second Edition. New York, NY: Taylor & Francis Group. Available: http://www.informaworld.com/10.1081/E-ESS-120044014.

Advancing Biofuels: Balancing for Sustainability - (Abstract Only)

Johnson, J.M., Karlen, D.L. 2009. Advancing Biofuels: Balancing for Sustainability [abstract]. American Chemical Society. 77:122.

Midwest soil and water conservation: Past, present and future - (Book / Chapter)

Karlen, D.L., Dinnes, D.L., Singer, J.W. 2010. Midwest soil and water conservation: Past, present and future. In: Zobeck, T.M., Schillinger, W.F., editors. Soil and Water Conservation Advances in the U.S.: Past Efforts and Future Outlook. Madison, WI: Soil Science Society of America, Inc. p. 131-162.

Quality Assessment of Corn Fields with Areas of Poor Canopy Development - (Abstract Only)

Stott, D.E., Cambardella, C.A., Tomer, M.D., Karlen, D.L. 2009. Quality Assessment of Corn Fields with Areas of Poor Canopy Development. ASA-CSSA-SSSA Annual Meeting Abstracts. CD ROM.

Corn Stover Feedstock Trial Update and Future Integrative Visioning - (Abstract Only)

Karlen, D.L. 2009. Corn Stover Feedstock Trial Update and Future Integrative Visioning [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 1-5, 2009, Pittsburgh, PA.

Soil Quality as an Indicator of Sustainable Biofuel Feedstock Production - (Abstract Only)

Karlen, D.L. 2009. Soil Quality as an Indicator of Sustainable Biofuel Feedstock Production [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 1-5, 2009, Pittsburgh, PA.

Impact of Biochar Amendments on the Quality of a Typical Midwestern Agricultural Soil - (Abstract Only)

Laird, D.A., Fleming, P.D., Davis, D., Baiqun, W., Horton, R., Karlen, D.L. 2009. Impact of Biochar Amendments on the Quality of a Typical Midwestern Agricultural Soil[CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 1-5, 2009, Pittsburgh, PA.

No-tillage Improvement of Soil Physical Quality in Calcareous, Degradation-prone, Semiarid Soils - (Peer Reviewed Journal)

Fernandez-Ugalde, O., Virto, I., Bescansa, P., Imaz, M.J., Enrique, A., Karlen, D.L. 2009. No-tillage Improvement of Soil Physical Quality in Calcareous, Degradation-prone, Semiarid Soils. Soil & Tillage Research. 106(1):29-35.

Evaluation of ß-Glucosidase Activity as a Soil Quality Indicator for the Soil Management Assessment Framework (SMAF) - (Peer Reviewed Journal)

Stott, D.E., Andrews, S.S., Liebig, M.A., Wienhold, B.J., Karlen, D.L. 2009. Evaluation of ß-Glucosidase Activity as a Soil Quality Indicator for the Soil Management Assessment Framework (SMAF). Soil Science Society of America Journal. 74(1):107-119.

Distribution of Phosphorus and Potassium Following Surface Banding of Fertilizer in Conservation Tillage Systems - (Proceedings)

Kovar, J.L., Bortolon, L., Karlen, D.L. 2009. Distribution of Phosphorus and Potassium Following Surface Banding of Fertilizer in Conservation Tillage Systems. Plant Nutrition Colloquium Proceedings. Available: http://escholarship.org/uc/item/8j0224dq

Bean leaf beetle (Coleoptera: Chrysomelidae) response to soybean variety and organic-compliant treatments in Iowa - (Peer Reviewed Journal)

Delate, K., Dewitt, J., Mckern, A., Rosmann, D., Karlen, D.L., Turnbull, R. 2009. Bean Leaf Beetle (Coleoptera: Chrysomelidae) Response to Soybean Variety and Organic-compliant Treatments in Iowa. Journal of Agricultural and Urban Entomology. 25:145-163.

Protocol for indicator scoring in the soil management assessment framework (SMAF) - (Peer Reviewed Journal)

Wienhold, B.J., Karlen, D.L., Andrews, S.S., Stott, D.E. 2009. Protocol for indicator scoring in the soil management assessment framework (SMAF). Renewable Agriculture and Food System. 24(4):260-266.

Use of the Soil Management Assessment Framework in Spatially Variable Fields - (Abstract Only)

Wienhold, B.J., Karlen, D.L., Andrews, S.S. 2009. Use of the Soil Management Assessment Framework in Spatially Variable Fields [abstract]. ASA-CSSA-SSSA Annual Meeting, November 1-5, 2009, Pittsburgh, Pennsylvania. 2009 CDROM. Abstract No. 51-5.

Distribution of energy in corn plants - (Abstract Only)

Cantrell, K.B., Novak, J.M., Frederick, J.R., Karlen, D.L., Watts, D.W. 2009. Distribution of energy in corn plants [abstract]. Proceedings of the American Society of Agronomy-Crop Science Society of America-Soil Science Society of America International Annual Meetings, November 1-5, 2009, Pittsburg, Pennsylvania.

Impact of Biochar Amendments on Soil Quality for a Typical Midwestern Agricultural Soil - (Abstract Only)

Laird, D.A., Fleming, P.D., Wang, B., Karlen, D.L. 2009. Impact of Biochar Amendments on Soil Quality for a Typical Midwestern Agricultural Soil. North Amer. Biochar Conf. 2009, Aug. 9-12, 2009, Boulder, CO. 28:50-38:11.

Crop Residues: The Rest of the Story - (Peer Reviewed Journal)

Karlen, D.L., Lal, R., Follett, R.F., Kimble, J.M., Hatfield, J.L., Miranowski, J.M., Cambardella, C.A., Manale, A., Anex, R.P., Rice, C.W. 2009. Crop Residues: The Rest of the Story. Environmental Science and Technology. 43(21):8011-8015.

Strategies for Sustainable Corn Stover Feedstock Production - (Proceedings)

Karlen, D.L., Birrell, S.J., Wendt, L.M., Hess, J.R. 2009. Strategies for Sustainable Corn Stover Feedstock Production. In: Proceedings of the International Soil Tillage Research Organization (ISTRO), June 15-19, 2009, Izmir, Turkey. p. 1-10.

Future Testing Opportunities to Ensure Sustainability of the Biofuels Industry - (Abstract Only)

Karlen, D.L., Kerr, B.J. 2009. Future Testing Opportunities to Ensure Sustainability of the Biofuels Industry [abstract]. International Symposium on Soil and Plant Analysis. p. 18.

Is No-Tillage Enough? A Field-Scale Watershed Assessment of Conservation Effects - (Peer Reviewed Journal)

Karlen, D.L., Dinnes, D.L., Tomer, M.D., Meek, D.W., Cambardella, C.A., Moorman, T.B. 2009. Is No-Tillage Enough? A Field-Scale Watershed Assessment of Conservation Effects. Journal of Integrative Biosciences. 7(2):1-24.

Developing Field Studies to Measure Corn Residue Removal Effects on Soil Organic Matter - A Multi-Location Approach - (Abstract Only)

Varvel, G.E., Karlen, D.L., Baker, J.M., Johnson, J.M., Osborne, S.L., Novak, J.M. 2009. Developing Field Studies to Measure Corn Residue Removal Effects on Soil Organic Matter - A Multi-Location Approach [abstract]. ASA-CSSA-SSSA Annual Meeting, November 1-5, 2009, Pittsburgh, Pennsylvania. 2009 CDROM. Abstract No. 163-7.

Fluid Fertilizer’s Role in Sustaining Soils Used for Bio-fuel Feedstock Production - (Proceedings)

Kovar, J.L., Karlen, D.L. 2009. Fluid Fertilizer’s Role in Sustaining Soils Used for Bio-fuel Feedstock Production. In: Fluid Fertilizer Foundation Symposium Proceedings. Fluid Fertilizer Forum, Feb. 15-17, 2009, Scottsdale, AZ 2009 CDROM.

Cover Crop and Liquid Manure Effects on Soil Quality Indicators in a Corn Silage System. - (Peer Reviewed Journal)

Jokela, W.E., Grabber, J.H., Karlen, D.L., Balser, T.C., Palmquist, D.E. 2009. Cover Crop and Liquid Manure Effects on Soil Quality Indicators in a Corn Silage System. Agronomy Journal. 101:727-737.

Soil management implications of producing biofuel feedstock - (Book / Chapter)

Johnson, J.M., Archer, D.W., Karlen, D.L., Weyers, S.L., Wilhelm, W.W. 2011. Soil management implications of producing biofuel feedstock. In: Hatfield, J. and Sauer, T., editors. Soil Management: Building a Stable Base for Agriculture. Madison, WI: American Society of Agronomy Special Publication. American Society of Agronomy and Soil Science Society of America. p. 371-390.

Development of Sustainable Corn Stover Feedstock Supply Strategies - (Abstract Only)

Karlen, D.L., Birrell, S.J., Johnson, J.M., Wilhelm, W.W., Baker, J.M. 2008. Development of Sustainable Corn Stover Feedstock Supply Strategies [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Oct. 5-9, 2008, Houston, TX.

Vertical distribution of corn stover dry mass - (Abstract Only)

Johnson, J.M., Wilhelm, W.W., Lightle, D., Karlen, D.L., Baker, J.M., Ochsner, T.E., Novak, J.M., Halvorson, A.D., Archer, D.W., Laird, D.A. 2008. Vertical distribution of corn stover dry mass [abstract][CD-ROM]. ASA-CSSA-SSSA Annual Meeting Abstracts. ASA-CSSA-SSSA Annual Meeting. Oct. 5-9, 2008, Houston, TX.

Three Analysis Examples for Time Series Data - (Abstract Only)

Meek, D.W., Laird, D.A., Dinnes, D.L., Jaynes, D.B., Cambardella, C.A., Colvin, T.S., Hatfield, J.L., Karlen, D.L. 2008. Three Analysis Examples for Time Series Data [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Oct. 5-9, 2008, Houston, TX.

Will Sulfur Limit Bioenergy Feedstock Production? - (Abstract Only)

Kovar, J.L., Karlen, D.L. 2008. Will Sulfur Limit Bioenergy Feedstock Production? [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Oct. 5-9, 2008, Houston, TX.

Challenges associated with sampling dynamic soil properties - (Abstract Only)

Zobeck, T.M., Wienhold, B.J., Karlen, D.L. 2008. Challenges associated with sampling dynamic soil properties. ASA-CSSA-SSSA Joint Annual Meeting. October 5-9, 2008. Houston, Texas. Paper No. 679-7.

Impact of Soil Biochar Applications on Nutrient Leaching - (Abstract Only)

Laird, D.A., Fleming, P.D., Wang, B., Horton, R., Karlen, D.L. 2008. Impact of Soil Biochar Applications on Nutrient Leaching [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Oct. 5-9, 2008, Houston, TX.

Recent advances in soil quality assessment in the United States - (Peer Reviewed Journal)

Wienhold, B.J., Andrews, S.S., Kuykendall, H., Karlen, D.L. 2008. Recent advances in soil quality assessment in the United States. Journal of Indian Society of Soil Science. 56(3):237-246. Available: indianjournals.com/ijor.aspx?target=ijor:jisss&type=home

Recognizing and reducing environmental risks to improve the benefits of bioenergy - (Abstract Only) - (09-Sep-08)

Soil Biochar Applications Enhance Sustainability of Bioenergy Feedstock Production - (Abstract Only) - (09-Sep-08)

CEAP – A New Paradigm for Natural Resources Research - (Other)

Karlen, D.L. 2008. CEAP – A New Paradigm for Natural Resources Research. Journal of Soil and Water Conservation. 63:220A.

A Landscape Vision for Sustainable Bioenergy Feedstock Production - (Abstract Only)

Karlen, D.L., Birrell, S.J., Laird, D.A., Cruse, R.M. 2008. A Landscape Vision for Sustainable Bioenergy Feedstock Production [abstract]. In: C.J. Hapeman (ed.) Chemistry for and from Agriculture Program v. 75 and Abstracts of the American Chemical Society, 236th National Meeting and Exposition, August 178-21, 2008, Philadelphia, PA.

Sustainable corn-based bioenergy farming systems - (Abstract Only)

Singer, J.W., Laird, D.A., Cambardella, C.A., Karlen, D.L., Moore, K.J., Lamkey, K.R., Hatfield, J.L. 2008. Sustainable corn-based bioenergy farming systems. AGRO Division [abstract]. American Chemical Society National Meeting. No. 162.

Soil Quality Assessment: Past, Present, and Future - (Peer Reviewed Journal)

Karlen, D.L., Andrews, S.S., Zobeck, T.M., Wienhold, B.J. 2008. Soil Quality Assessment: Past, Present, and Future. Electronic Journal of Integrative Biosciences. 6(1):3-14. Available: www.clt.astate.edu/electronicjournal.

Grass-Based Farming Systems: Soil Conservation and Environmental Quality - (Book / Chapter)

Singer, J.W., Franzluebbers, A.J., Karlen, D.L. 2009. Grass-Based Farming Systems: Soil Conservation and Environmental Quality. In: Wedin, W.F., Fales, S., editors. Grasslands: Quietness and Strength for a New American Agriculture. Madison, WI: ASA. p. 121-136.

Balancing Feedstock Production and Soil Resource Protection - (Proceedings)

Karlen, D.L., Baker, J.M., Wilhelm, W.W., Johnson, J.E. 2008. Balancing Feedstock Production and Soil Resource Protection. In: Proceedings of the Midwest Area Bioenergy Research Forum, July 18, 2008, Peoria, IL. 2008 CDROM.

Sustainable Corn Stover Harvest Strategies - (Proceedings)

Karlen, D.L., Birrell, S.J., Hess, J.R., Wilhelm, W.W. 2008. Sustainable Corn Stover Harvest Strategies. In: Proceedings of the Midwest Area Bioenergy Research Forum, July 18, 2008, Peoria IL. 2008 CDROM.

Rainfed farming systems in the USA - (Book / Chapter)

Franzluebbers, A.J., Steiner, J.L., Karlen, D.L., Griffin, T.S., Singer, J.W., Tanaka, D.L. 2011. Rainfed farming systems in the USA. In: Tow, P., Cooper, I., Partridge, I., Birch, C. editors. Rainfed Farming Systems. Heidelberg, Germany: Springer Publishing. p. 511-560.

Simulated Corn Stover Removal Effects on Soil Organic Carbon and Nitrogen Dynamics - (Abstract Only)

Ma, L., Malone, R.W., Ahuja, L.R., Karlen, D.L., Saseendran, S.A. 2009. Simulated Corn Stover Removal Effects on Soil Organic Carbon and Nitrogen Dynamics. American Society of Agronomy Meetings, Houston, TX, October 5, 2009.

Sustainability Indicators: A Scientific Assessment - (Other)

Karlen, D.L. 2008. Book Review of Sustainability Indicators: A Scientific Assessment. Journal of Environmental Quality. 37:1663.

Comparison of two soil quality indexes to evaluate cropping systems in northern Colorado - (Peer Reviewed Journal)

Zobeck, T.M., Halvorson, A.D., Wienhold, B.J., Acosta Martinez, V., Karlen, D.L. 2008. Comparison of two soil quality indexes to evaluate cropping systems in northern Colorado. Journal of Soil and Water Conservation. 63(5):329-338.

A Preliminary Watershed Scale Soil Quality Assessment in North Central Iowa USA - (Peer Reviewed Journal)

Karlen, D.L., Tomer, M.D., Neppel, J., Cambardella, C.A. 2008. A Preliminary Watershed Scale Soil Quality Assessment in North Central Iowa USA. Soil & Tillage Research. 99:291-299.

Fluid Fertilizer's Role in Sustainng Soils Used for Bio-Fuels Production - (Proceedings)

Kovar, J.L., Karlen, D.L. 2008. Fluid Fertilizer's Role in Sustainng Soils Used for Bio-Fuels Production. In: Fluid Fertilizer Foundation Symposium Proceedings. Fluid Fertilizer Forum, February 17-19, 2008, Scottsdale, AZ. 2008 CDROM.

Agriculture in the U.S. Corn Belt: Past, Present, and Future - (Abstract Only)

Karlen, D.L., Singer, J.W., Gibson, L.R. 2007. Agriculture in the U.S. Corn Belt: Past, Present, and Future [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 4-8, 2007, New Orleans, LA.

Will Sulfur Limit Bio-fuel Corn Production? - (Abstract Only)

Kovar, J.L., Karlen, D.L. 2007. Will Sulfur Limit Bio-fuel Corn Production? [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 4-8, 2007, New Orleans, LA.

Evaluation of Organic Pest Management Treatments for Bean Leaf Beetle in Soybean in Iowa - (Abstract Only)

Mckern, A., Rosmann, M., Delate, K., Karlen, D.L. 2007. Evaluation of Organic Pest Management Treatments for Bean Leaf Beetle in Soybean in Iowa [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 4-8, 2007, New Orleans, LA.

Lignocellulosic Biomass Quality Changes in Relation to Available Feedstock Tonnage - (Abstract Only)

Radtke, C., Karlen, D.L., Birrell, S., Petzke, L., Pryfogle, P.A., Hess, J.R. 2007. Lignocellulosic Biomass Quality Changes in Relation to Available Feedstock Tonnage [abstract]. In: Abstracts of the American Institute of Chemical Engineers Annual Meeting, Nov. 4-9, 2007, Salt Lake City, UT CDROM.

Balancing Bioenergy Opportunities on Your Natural Resources Base - (Proceedings)

Karlen, D.L. 2007. Balancing Bioenergy Opportunities on Your Natural Resources Base [CD-ROM]. Indiana Crop Advisors Conference Meeting Proceedings. Dec. 18-19, 2007. Indianapolis, IN.

Soil Fertility Management Strategies -- Philosophies, Crop Response and Costs - (Other)

Exner, R., Delate, K., Karlen, D.L. 2007. Soil Fertility Management Strategies -- Philosophies, Crop Response and Costs. Iowa State University - University Extension. p. 2-10.

Soil Management Assessment Framework: Developing indicator scoring curves for soil enzymes - (Abstract Only)

Stott, D.E., Wienhold, B.J., Karlen, D.L., Andrews, S.S. 2007. Soil Management Assessment Framework: Developing indicator scoring curves for soil enzymes. Soil Science Society of America Annual Meeting, November 4-8, 2007, New Orleans, Louisiana. 2007 CDROM.

Cover Crop and Manure Effects on Soil Properties in a Corn Silage System - (Abstract Only)

Jokela, W.E., Grabber, J.H., Karlen, D.L., Balser, T.C. 2007. Cover Crop and Manure Effects on Soil Properties in a Corn Silage System. In: American Society of Agronomy Abstracts. American Society of Agronomy Annual Meeting, November 4-8, 2007, New Orleans, Louisiana. 2007 CDROM.

Balancing crop biomass for bioenergy and conservation - (Abstract Only)

Karlen, D.L., Johnson, J.M., Wilhelm, W.W., Follett, R.F. 2007. Balancing crop biomass for bioenergy and conservation [abstract]. Soil and Water Conservation Society, p. 64.

Corn Stover to Sustain Organic Carbon Further Constrains Biomass Supply - (Peer Reviewed Journal)

Wilhelm, W.W., Johnson, J.M., Karlen, D.L., Lightle, D. 2007. Corn Stover to Sustain Organic Carbon Further Constrains Biomass Supply. Agronomy Journal. 99:1665-1667.

EMPIRICAL ANALYSIS AND PREDICTION OF NITRATE LOADING AND CROP YIELD FOR A CORN-SOYBEAN ROTATIONS - (Peer Reviewed Journal)

Malone, R.W., Ma, L., Karlen, D.L., Meade, T.G., Meek, D.W., Heilman, P., Kanwar, R.S., Hatfield, J.L. 2007. Empirical analysis and prediction of nitrate loading and crop yield for a corn-soybean rotations. Geoderma. 140:223-234.

Simulated N Management Effects on Corn Yield and Tile-Drainage Nitrate Loss - (Peer Reviewed Journal)

Malone, R.W., Ma, L., Heilman, P., Karlen, D.L., Kanwar, R.S., Hatfield, J.L. 2007. Simulated N Management Effects on Corn Yield and Tile-Drainage Nitrate Loss. Geoderma. 140:272-283.

Evaluating and predicting agricultural management effects under tile-drainage using modified APSIM - (Peer Reviewed Journal)

Malone, R.W., Huth, N., Carberry, P.S., Ma, L., Kaspar, T.C., Karlen, D.L., Meade, T.G., Kanwar, R.S., Heilman, P. 2007. Evaluating and predicting agricultural management effects under tile-drainage using modified APSIM. Geoderma. 140:310-322.

Soil Profile Nitrate Response to Nitrogen Fertilization of Winter Triticale - (Peer Reviewed Journal)

Nance, C.D., Gibson, L.R., Karlen, D.L. 2007. Soil Profile Nitrate Response to Nitrogen Fertilization of Winter Triticale. Soil Science Society of America Journal. 71:1343-1351.

Soil Quality Assessment -- A Value Added Opportunity for Soil Testing Laboratories - (Proceedings)

Karlen, D.L., Zobeck, T.M., Wienhold, B.J. 2007. Soil Quality Assessment -- A Value Added Opportunity for Soil Testing Laboratories. In: Proceedings of the Eighteenth Soil/Plant Analysts Workshop, February 27-28, 2007, Bettendorf, Iowa. North Central Extension and Research Activity (NCERA-13), Michigan State University, East Lansing, Michigan 48824-1325. p.63-69.

Producer-Researcher Interactions on On-Farm Research: A Case Study on Developing a Certified Organic Research Site - (Peer Reviewed Journal)

Karlen, D.L., Cambardella, C.A., Bull, C.T., Chase, C.A., Gibson, L.R., Delate, K. 2007. Producer-Researcher Interactions on On-Farm Research: A Case Study on Developing a Certified Organic Research Site. Agronomy Journal. 99:779-790.

Crop Residue Removal Effects on Production Costs and Soil Quality - (Abstract Only)

Karlen, D.L., Birrell, S.J., Radtke, C.J., Wilhelm, W.W. 2006. Crop Residue Removal Effects on Production Costs and Soil Quality. In: ASA-CSSA-SSSA Annual Meeting Abstracts. ASA-CSSA-SSSA Annual Meeting, Indianapolis, Indiana, November 12-16, 2006. 2006 CD-ROM.

RZWQM Simulation Of Long-Term Crop Production, Water And Nitrogen Balances In Northeast Iowa - (Peer Reviewed Journal)

Ma, L., Malone, R.W., Heilman, P., Karlen, D.L., Kanwar, R., Cambardella, C.A., Ahuja, L.R. 2007. RZWQM simulation of long-term crop production, water and nitrogen balances in northeast Iowa. Geoderma 140(3):247-259. doi: 10.1016/j.geoderma.2007.04.009.

SIMULATING MANAGEMENT EFFECTS ON CROP PRODUCTION, TILE DRAINAGE, AND WATER QUALITY USING RZWQM-DSSAT - (Peer Reviewed Journal)

Anapalli, S., Ma, L., Malone, R.W., Heilman, P., Ahuja, L.R., Kanwar, R., Karlen, D.L., Hoogenboom, G. 2007. Simulating management effects on crop production, tile drainage, and water quality using RZWQM-DSSAT. Geoderma 140:3 (2007)297-309. Published on-line 5/23/2007. doi:10.1016/j.geoderma.2007.04.013.

Response to "Comments on 'Need for a Soil-based Approach in managing Nitrogen Fertilizers for Profitable Corn Production' and 'Soil Organic Nitrogen Enrichment Following Soybean in an Iowa Corn-Soybean Rotation'" - (Other)

Jaynes, D.B., Olk, D.C., Colvin, T., Kaspar, T.C., Karlen, D.L. 2007. Response to "Comments on 'Need for a Soil-based Approach in managing Nitrogen Fertilizers for Profitable Corn Production' and 'Soil Organic Nitrogen Enrichment Following Soybean in an Iowa Corn-Soybean Rotation'". Soil Science Society of America Journal. 71(1):255.

Sustainable Production of Crop Residue as a Cellulosic Ethanol Feedstock: REAP – Renewable Energy Assessment Project - (Abstract Only)

Jaradat, A.A., Johnson, J.M., Karlen, D.L., Wilhelm, W.W. 2006. Sustainable Production of Crop Residue as a Cellulosic Ethanol Feedstock: REAP – Renewable Energy Assessment Project sponsored by USDA & DOE. Oct 10-12 2006, St Louis, MO. Meeting Abstract.

Winter triticale response to nitrogen fertilization when grown after corn or soybean - (Peer Reviewed Journal)

Gibson, L.R., Nance, C.D., Karlen, D.L. 2007. Winter triticale response to nitrogen fertilization when grown after corn or soybean. Agronomy Journal. 99:49-58.

ASSESSING SOIL QUALITY AT A WATERSHED SCALE IN NORTH CENTRAL IOWA, USA - (Proceedings)

Karlen, D.L., Tomer, M.D., Neppel, J., Cambardella, C.A. 2006. Assessing soil quality at a watershed scale in North Central Iowa, USA. 17th International Soil Tillage Research Organization (ISTRO) Proceedings. p.1255-1267.

Crop Residue as Feedstock for the New Bioeconomy: Opportunities and Roadblocks - (Abstract Only)

Wilhelm, W.W., Varvel, G.E., Karlen, D.L., Johnson, J.M., Baker, J. 2006. Crop Residue as Feedstock for the New Bioeconomy: Opportunities and Roadblocks. In Annual meeting abstract [CD-ROM]. ASA, CSSA, SSSA. Madison, WI.

ENGINEERING, NUTRIENT REMOVAL, AND FEEDSTOCK CONVERSION EVALUATIONS OF FOUR CORN STOVER HARVEST SCENARIOS - (Peer Reviewed Journal)

Hoskinson, R., Karlen, D.L., Birrell, S.J., Radtke, C.W., Wilhelm, W.W. 2006. Engineering, nutrient removal, and feedstock conversion evaluations of four corn stover harvest scenarios. Biomass and Bioenergy. 31(2-3): 126-136. Available: http://www.sciencedirect.com/science?

EMPIRICAL MODELING OF NITRATE LOADING AND CROP YIELD FOR CORN-SOYBEAN ROTATIONS IN IOWA - (Abstract Only) - (11-May-06)

APPLICATION OF THE ANNAGNPS MODEL TO THE WALNUT CREEK, IA CEAP BENCHMARK WATERSHED - (Abstract Only)

Dinnes, D.L., Jaynes, D.B., Karlen, D.L., Bingner, R.L., Yuan, Y. 2006. Application of the ANNAGNPS model to the Walnut Creek, IA CEAP benchmark watershed. 2006 USDA-ARS CEAP Watershed Assessment Study Annual Meeting. Available: www.nrcs.usda.gov/TECHNICAL/nri/ceap/watersheds/2006meeting.html.

IS POTASSIUM LIMITING NO-TILL CORN YIELDS? - (Proceedings)

Karlen, D.L., Kovar, J.L. 2006. Is potassium limiting no-till corn yields? Proceedings of Great Plains Soil Fertility Conference. 11:206-211.

NO-TILL CORN RESPONSE TO BANDED K ON DES MOINES LOBE SOILS - (Proceedings)

Karlen, D.L., Kovar, J.L. 2006. No-till corn response to banded K on Des Moines lobe soils. In: Fluid Fertilizer Foundation Symposium Proceedings. Fluid Feritlizer Forum 2006, February 12-14, 2006, Scottsdale, AZ. 2006 CD-ROM

SOIL QUALITY: INDICES AND APPRAISAL. PP. 67-72. PROC. INTERNATIONAL CONFERENCE ON SOIL, WATER, AND ENVIRONMENTAL QUALITY – ISSUES AND STRATEGIES. NEW DELHI, INDIA. - (Proceedings)

Wienhold, B.J., Andrews, S.S., Karlen, D.L. 2006. Soil quality: indices and appraisal. pp. 67-72. Proc. International Conference on Soil, Water, and Environmental Quality – issues and strategies. New Delhi, India.. International Symposium on Ecological Indicators and Indices.

PLANTING DATE EFFECTS ON WINTER TRITICALE GRAIN YIELD AND YIELD COMMPONENTS - (Peer Reviewed Journal)

Schwarte, A.J., Gibson, L.R., Karlen, D.L., Liebman, M., Jannink, J. 2006. Planting date effects on winter triticale grain yield and yield commponents. Crop Science. 46:1218-1224.

CROP ROTATION EFFECTS ON SOIL QUALITY AT THREE NORTHERN CORN/SOYBEAN BELT LOCATIONS - (Peer Reviewed Journal)

Karlen, D.L., Hurley, E.G., Andrews, S.S., Cambardella, C.A., Meek, D.W., Duffy, M.D., Mallarino, A.P. 2006. Crop rotation effects on soil quality at three northern corn/soybean belt locations. Agronomy Journal. 98:484-495.

THE SOIL RESOURCE MANAGEMENT NATIONAL PROGRAM -- CHALLENGES AND OPPORTUNITIES - (Abstract Only)

Karlen, D.L., Franzluebbers, A.J., Busscher, W.J., Baumhardt, R.L., Wright, R.J., Jawson, M.D. 2005. The soil resource management national program -- challenges and opportunities [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 6-10, 2005, Salt Lake City, UT.

SUSTAINING SOIL RESOURCES WHILE MANAGING NUTRIENTS - (Proceedings)

Jaynes, D.B., Karlen, D.L. 2005. Sustaining soil resources while managing nutrients. In: Final Report: Gulf Hypoxia and Local Water Quality Concerns Workshop, September 26-28, 2005, Ames, Iowa. p. 149-158.

IDENTIFYING SPATIAL PATTERNS OF EROSION FOR USE IN PRECISION CONSERVATION - (Peer Reviewed Journal)

Schumacher, J.A., Venteris, E.R., Mccarty, G.W., Ritchie, J.C., Kaspar, T.C., Colvin, T.S., Jaynes, D.B., Karlen, D.L., Fenton, T.E., Schumacher, T.E., Lindstrom, M.J. 2005. Identifying spatial patterns of erosion for use in precision conservation. Journal of Soil and Water Conservation. 60(6):355-362.

IS K THE CINDERELLA NUTRIENT FOR REDUCED-TILL SYSTEMS? - (Trade Journal)

Karlen, D.L., Kovar, J.L. 2005. Is K the Cinderella nutrient for reduced-till systems? Fluid Journal. 13(4):8-11.

ASSESSING SOIL FERTILITY IN THE SOUTH FORK WATERSHED OF THE IOWA RIVER - (Proceedings)

Nepple, J., Tomer, M.D., Karlen, D.L. 2005. Assessing soil fertility in the south fork watershed of the Iowa river. Soil Conservation and Water Quality Symposium Proceedings. Available: http://www.swcs.org/en/swcs_international_conferences/2005_annual_conference/index.cfm?nodeID=7456&audienceID=1

SOIL AMINO ACID ENRICHMENT FOLLOWING SOYBEAN IN AN IOWA CORN-SOYBEAN ROTATION 1753 - (Peer Reviewed Journal)

Martens, D.A., Jaynes, D.B., Colvin, T.S., Kaspar, T.C., Karlen, D.L. 2006. Soil amino acid enrichment following soybean in an Iowa corn-soybean rotation. Soil Science Society of America Journal. 70:382-392.

PROFIT AND YIELD OF TILLAGE IN COTTON PRODUCTION SYSTEMS - (Peer Reviewed Journal)

Buman, R.A., Alessi, B.A., Bradley, J.F., Hatfield, J.L., Karlen, D.L. 2005. Profit and yield of tillage in cotton production systems. Journal of Soil and Water Conservation Society. 60(5):235-242.

PLANTING DATE EFFECTS ON WINTER TRITICALE DRY MATTER AND NITROGEN ACCUMULATION - (Peer Reviewed Journal)

Schwarte, A.J., Gibson, L.R., Karlen, D.L., Liebman, M., Jannink, J. 2005. Planting date effects on winter triticale dry matter and nitrogen accumulation. Agronomy Journal. 97:1333-1341.

IS K THE CINDERELLA NUTRIENT FOR REDUCED TILLAGE SYSTEMS? - (Proceedings)

Karlen, D.L., Kovar, J.L. 2005. Is K the Cinderella nutrient for reduced tillage systems? [CD-ROM] In: Fluid Fertilizer Foundation Symposium Proceedings, Feb. 13-15, 2005, Scottsdale, Arizona.

CORN RESPONSE TO LATE-SPRING NITROGEN MANAGEMENT IN THE WALNUT CREEK WATERSHED - (Peer Reviewed Journal)

Karlen, D.L., Dinnes, D.L., Jaynes, D.B., Hurburgh, C.R., Cambardella, C.A., Colvin, T.S., Rippke, G.R. 2005. Corn response to late-spring nitrogen management in the Walnut Creek watershed. Agronomy Journal. 97:1054-1061.

EFFECTS OF LIQUID SWINE MANURE APPLICATIONS ON NO3-N LEACHING LOSSES TO SUBSURFACE DRAINAGE WATER FROM LOAMY SOILS IN IOWA - (Peer Reviewed Journal)

Bakhsh, A., Kanwar, R.S., Karlen, D.L. 2005. Effects of liquid swine manure applications on NO3-N leaching losses to subsurface drainage water from loamy soils in Iowa. Agriculture Ecosystems and the Environment. 105:118-128.

EFFECTS OF GRAZING CORN STALKS ON SOIL PHYSICAL PROPERTIES - (Proceedings)

Karlen, D.L., Clark, J., Russell, J., Busby, D., Peterson, B., Singleton, P. 2005. Effects of grazing corn stalks on soil physical properties. In: Proceedings of the Heart of American Grazing Conference, January 19-20, 2005, Wilmington, OH.

SOIL, WHEAT, AND SORGHUM RESPONSE TO TILLAGE UNDER RHIZOTRON CONDITIONS - (Abstract Only)

Karlen, D.L., Jaynes, D.B., Pellack, L.S., Heikens, K.E. 2004. Soil, Wheat, and Sorghum Response to Tillage Under Rhizotron Conditions [CD-ROM]. ASA-CSSA-SSSA Annual Meeting Abstracts. Madison, Wisconsin.

IDENTIFYING SPATIAL PATTERNS OF EROSION FOR USE IN PRECISION CONSERVATION - (Abstract Only)

Schumacher, J.A., Venteris, E.R., Mccarty, G.W., Ritchie, J.C., Kaspar, T.C., Colvin, T.S., Jaynes, D.B., Karlen, D.L., Fenton, T.E., Schumacher, T.E., Lindstrom, M.J. 2004. Identifying Spatial Patterns of Erosion for Use in Precision Conservation [CD-ROM]. ASA-CSSA-SSSA Annual Meeting Abstracts. Madison, Wisconsin. p. 4780.

PROFIT, YIELD, AND SOIL QUALITY EFFECTS OF TILLAGE IN CORN / SOYBEAN ROTATIONS - (Peer Reviewed Journal)

Buman, R.A., Alessi, B.A., Hatfield, J.L., Karlen, D.L. 2004. Profit, yield, and soil quality effects of tillage in corn / soybean rotations. Journal of Soil and Water Conservation. 59:260-270.

IMPLEMENTING THE SMAF FOR ENVIRONMENTAL QUALITY POLICY: WATER QUALITY IMPLICATIONS IN IOWA - (Abstract Only)

Hatfield, J.L., Karlen, D.L. 2004. Implementing the SMAF for environmental quality policy: water quality implications in Iowa [abstract]. Soil and Water Conservation Society. Available: http://www.swcs.org/t_what2004confabstractsCONTACTS.htm.

WATERSHED-SCALE ASSESSMENT OF SOIL QUALITY IN THE LOESS HILLS OF SOUTHWEST IOWA - (Peer Reviewed Journal)

Cambardella, C.A., Moorman, T.B., Andrews, S.S., Karlen, D.L. 2004. Watershed-scale assessment of soil quality in the loess hills of southwest Iowa. Soil & Tillage Research. 78(2):237-247.

QUANTIFICATION OF TILLAGE AND LANDSCAPE EFFECTS ON SOIL CARBON IN SMALL IOWA WATERSHEDS - (Peer Reviewed Journal)

Moorman, T.B., Cambardella, C.A., James, D.E., Karlen, D.L., Kramer, L.A. 2004. Quantification of tillage and landscape effects on soil carbon in small Iowa watersheds. Soil & Tillage Research. 78(2):225-236.

FORAGES FOR CONSERVATION AND IMPROVED SOIL QUALITY - (Book / Chapter)

Karlen, D.L., Lemunyon, J.L., Singer, J.W. 2006. Forages for Conservation and Improved Soil Quality. In: Barnes, R.F., Nelson, C.J., Moore, K.J., Collins, M., editors. Sixth Edition of Forages, Volume II The Science of Grassland Agriculture. Ames, IA: Blackwell Publishing, Inc. p-149-166.

LIQUID SWINE MANURE MANAGEMENT CHALLENGES ON TILE-DRAINED SOILS - (Peer Reviewed Journal)

Karlen, D.L. 2004. Liquid swine manure management challenges on tile-drained soils. Applied Engineering in Agriculture. 20(5):693-699.

THE SOIL MANAGEMENT ASSESSMENT FRAMEWORK: A QUANTITATIVE SOIL QUALITY EVALUATION METHOD WITH CASE STUDIES - (Peer Reviewed Journal)

Andrews, S.S., Karlen, D.L., Cambardella, C.A. 2004. The soil management assessment framework: a quantitative soil quality evaluation method with case studies. Soil Science Society of America Journal. 68:1945-1962.

SOIL DEGRADATION IN THE UNITED STATES: EXTENT, SEVERITY, AND TRENDS (A BOOK REVIEW) - (Other)

Karlen, D.L. 2004. Soil Degradation in the United States: Extent, Severity, and Trends (A Book Review). Soil Science. 169(8):609-611.

CORN-SOYBEAN AND ALTERNATIVE CROPPING SYSTEMS EFFECTS ON NO3-N LEACHING LOSSES IN SUBSURFACE DRAINAGE WATER - (Peer Reviewed Journal)

Kanwar, R.S., Cruse, R., Ghaffarzadeh, M., Bakhsh, A., Karlen, D.L., Bailey, T. 2005. Corn-soybean and alternative cropping systems effects on NO3-N leaching losses in subsurface drainage water. Applied Engineering in Agriculture. 21(2):181-188.

SOIL SURFACE PROPERTY AND SOYBEAN YIELD RESPONSE TO CORN STOVER GRAZING - (Peer Reviewed Journal)

Clark, J.T., Russell, J.R., Karlen, D.L., Singleton, P.L., Busby, W.D., Peterson, B.C. 2004. Corn Stover Grazing Effects on Soil Physical Properties and Subsequent Soybean Yield. Agronomy Journal. 96(5):1364-1371.

ORGANIC SOYBEAN PRODUCTION: CHALLENGES AND PERSPECTIVES OF AN INCREASING TREND - (Proceedings)

Karlen, D.L., Delate, K., Turnbull, R., Boes, J. 2004. Organic soybean production: challenges and perspectives of an increasing trend. Soybean Research World Conference Proceedings. p. 319-327.

THE CONSERVATION AND IMPROVEMEMT OF SLOPING LAND, VOL. 1: PRACTICAL UNDERSTANDING (A BOOK REVIEW) - (Other)

Karlen, D.L. 2004. The Conservation and Improvememt of Sloping Land, Vol. 1: Practical Understanding (a book review). Journal of Environmental Quality. 33:1577-1578.

RELATIONSHIP OF CORN AND SOYBEAN YIELD TO SOIL AND TERRAIN PROPERTIES - (Peer Reviewed Journal)

Kaspar, T.C., Pulido, D.J., Fenton, T.E., Colvin, T.S., Karlen, D.L., Jaynes, D.B., Meek, D.W. 2004. Relationship of corn and soybean yield to soil and terrain properties. Agronomy Journal. 96(3):700-709.

SOIL QUALITY AS AN INDICATOR OF SUSTAINABLE TILLAGE PRACTICES - (Peer Reviewed Journal)

Karlen, D.L. 2004. Soil quality as an indicator of sustainable tillage practices. Soil & Tillage Research. 78:129-130.

IMPLEMENT AND SOIL CONDITION EFFECTS ON TILLAGE-INDUCED EROSION - (Peer Reviewed Journal)

Marques Da Silva, J.R., Soares, J.M., Karlen, D.L. 2004. Implement and soil condition effects on tillage-induced erosion. Soil & Tillage Research. 78:207-216.

APPLICATIONS AND IMPLICATIONS OF THE SOIL MANAGEMENT ASSESSMENT FRAMEWORK - (Abstract Only)

ANDREWS, S.S., KARLEN, D.L., NORFLEET, L., CAMBARDELLA, C.A. APPLICATIONS AND IMPLICATIONS OF THE SOIL MANAGEMENT ASSESSMENT FRAMEWORK. ASA-CSSA-SSSA PROCEEDINGS. 2003. CD-ROM. MADISON, WI.

SOIL QUALITY INDICATOR RESPONSE TO CORN STALK GRAZING - (Abstract Only)

CLARK, J.T., KARLEN, D.L., RUSSELL, J.R. SOIL QUALITY INDICATOR RESPONSE TO CORN STALK GRAZING. ASA-CSSA-SSSA ANNUAL MEETING ABSTRACTS. 2003. CD-ROM. MADISON, WI.

SOIL FERTILITY PARADIGMS -- CATION RATIO AND SUFFICIENCY -- COMPARED ON-FARM AND ON-STATION - (Abstract Only)

EXNER, D.N., DELATE, K., KARLEN, D.L. SOIL FERTILITY PARADIGMS -- CATION RATIO AND SUFFICIENCY -- COMPARED ON-FARM AND ON-STATION. ASA-CSSA-SSSA ANNUAL MEETING ABSTRACTS. 2003. CD-ROM. MADISON, WI.

SIMULATING LATE SPRING NITROGEN TEST EFFECTS ON N LEACHING AND CROP PRODUCTION - (Abstract Only)

MALONE, R.W., MEADE, T.G., MA, L., ANAPALLI, S.A., KANWAR, R.S., KARLEN, D.L., HATFIELD, J.L., AHUJA, L.R. SIMULATING LATE SPRING NITROGEN TEST EFFECTS ON N LEACHING AND CROP PRODUCTION. CD-ROM. MADISON, WI. AMERICAN SOCIETY OF AGRONOMY MEETINGS. 2003.

SIMULATING SWINE MANURE EFFECTS ON N LEACHING AND CROP PRODUCTION - (Abstract Only)

MA, L., MALONE, R.W., ANAPALLI, S.A., MEADE, T.G., KANWAR, R.S., KARLEN, D.L., HATFIELD, J.L., AHUJA, L.R. SIMULATING SWINE MANURE EFFECTS ON N LEACHING AND CROP PRODUCTION. CD-ROM. MADISON, WI. AMERICAN SOCIETY OF AGRONOMY MEETINGS. 2003.

USING THE LATE SPRING NITRATE TEST TO REDUCE NITRATE LOSS WITHIN A WATERSHED - (Peer Reviewed Journal)

JAYNES, D.B., DINNES, D.L., MEEK, D.W., KARLEN, D.L., CAMBARDELLA, C.A., COLVIN, T.S. USING THE LATE SPRING NITRATE TEST TO REDUCE NITRATE LOSS WITHIN A WATERSHED. JOURNAL OF ENVIRONMENTAL QUALITY. 2004. V. 33(2). P. 656-668.

A LOOK BACK AT A LONG TERM TILLAGE EXPERIMENT AND A LOOK FORWARD AT THE POTENTIAL FOR SITE SPECIFIC TILLAGE - (Abstract Only)

COLVIN, T.S., TAPELA, M., MEEK, D.W., COOK, J.D., BAKER, J., CRUSE, R., KARLEN, D.L. A LOOK BACK AT A LONG TERM TILLAGE EXPERIMENT AND A LOOK FORWARD AT THE POTENTIAL FOR SITE SPECIFIC TILLAGE. TILLAGE CONFERENCE PROCEEDINGS. 2003. CD-ROM. WOOSTER, OH.

TILTH - (Other)

Karlen, D.L. 2004. Tilth. In: Hillel, D., editor. Encyclopedia of Soils in the Environment. Vol. 3. p. 330-336.

PRODUCTIVITY OF SOILS - (Other)

Karlen, D.L. 2004. Productivity of soils. In: Hillel, D., editor. Encyclopedia of Soils in the Environment. Vol. 4. p. 168-174.

SOIL QUALITY -- HUMANKIND'S FOUNDATION FOR SURVIVAL - (Peer Reviewed Journal)

KARLEN, D.L., DORAN, J.W., ANDREWS, S.S., WIENHOLD, B.J. SOIL QUALITY -- HUMANKIND'S FOUNDATION FOR SURVIVAL. JOURNAL OF SOIL AND WATER CONSERVATION. 2003. V. 58(4). P. 171-179.

SOIL QUALITY: WHY AND HOW? - (Peer Reviewed Journal)

KARLEN,D.L., DITZLER,C.A., ANDREWS,S.S., SOIL QUALITY: WHY AND HOW?, GEODERMA, 2003. Vol. 114, Issues 3-4, p. 145-156.

GROWERS' PERCEPTIONS AND ACCEPTANCE OF SOIL QUALITY INDICES - (Peer Reviewed Journal)

ANDREWS,S.S., FLORA,C.B., MITCHELL,J.P., KARLEN,D.L., GROWERS' PERCEPTIONS AND ACCEPTANCE OF SOIL QUALITY INDICES, GEODERMA, 2003. V.114. P. 187-213.

PROFITABILITY OF VARIOUS CORN, SOYBEAN, WHEAT, AND ALFALFA CROPPING SYSTEMS - (Peer Reviewed Journal)

SINGER, J.W., CHASE, C.A., KARLEN, D.L. PROFITABILITY OF VARIOUS CORN, SOYBEAN, WHEAT, AND ALFALFA CROPPING SYSTEMS. CROP MANAGEMENT at www.cropmanagement.org. 2003. Available from: www.cropmanagement.org/doi:10.1094/CM-2003-0130-01-RS.

SOIL QUALITY, FERTILITY, AND HEALTH - HISTORICAL CONTEXT, STATUS, AND PERSPECTIVES - (Book / Chapter)

KARLEN, D.L., WIENHOLD, B.J., ANDREWS, S.S. SOIL QUALITY, FERTILITY, AND HEALTH - HISTORICAL CONTEXT, STATUS, AND PERSPECTIVES. SCHJONNING, S., ELMHOLT, S., CHRISTENSEN, B.T., EDITORS. CAB INTERNATIONAL, CAMBRIDGE, MA. MANAGING SOIL QUALITY: CHALLENGES IN MODERN AGRICULTURE; CHAPTER 2. 2004. P. 17-33.

TRANSITION CHANGES ASSOCIATED WITH IMPLEMENTING ORGANIC AGRICULTURE RESEARCH - (Abstract Only)

KARLEN, D.L., DELATE, K., GIBSON, L.R., BRUMMER, E.C. TRANSITION CHANGES ASSOCIATED WITH IMPLEMENTING ORGANIC AGRICULTURE RESEARCH. AMERICAN SOCIETY OF AGRONOMY MEETINGS. 2002. CD-ROM. MADISON, WI.

DOES SOIL QUALITY SHOW AN ECONOMIC BENEFIT FOR LONG-TERM CROP ROTATION? - (Abstract Only)

KARLEN, D.L., HURLEY, E.G., ANDREWS, S.S., DUFFY, M.D., MALLARINO, A.P., CAMBARDELLA, C.A. DOES SOIL QUALITY SHOW AN ECONOMIC BENEFIT FOR LONG-TERM CROP ROTATION?. AMERICAN SOCIETY OF AGRONOMY MEETINGS. 2002. CD-ROM. MADISON, WI.

THE NEED FOR AND ATTEMPTS AT RELATING SOIL QUALITY ASSESSMENT TO ECONOMIC RETURN - (Abstract Only)

ANDREWS, S.S., KARLEN, D.L., FLORA, C.B., NISSEN, T.M., MITCHELL, J.P. THE NEED FOR AND ATTEMPTS AT RELATING SOIL QUALITY ASSESSMENT TO ECONOMIC RETURN. AMERICAN SOCIETY OF AGRONOMY MEETINGS. 2002. CD-ROM. MADISON, WI.

LINKING SOIL QUALITY TO ECONOMICS USING MANAGEMENT PRACTICE INDICATORS - (Abstract Only)

CAMBARDELLA, C.A., KARLEN, D.L., ANDREWS, S.S., DUFFY, M.D. LINKING SOIL QUALITY TO ECONOMICS USING MANAGEMENT PRACTICE INDICATORS. ASA-CSSA-SSSA PROCEEDINGS. 2002. CD-ROM. MADISON, WI.

CORN RESPONSE TO NITROGEN ACROSS LANDSCAPE POSITIONS - (Abstract Only)

KASPAR, T.C., COLVIN, T.S., JAYNES, D.B., KARLEN, D.L. CORN RESPONSE TO NITROGEN ACROSS LANDSCAPE POSITIONS. ASA-CSSA-SSSA ANNUAL MEETING ABSTRACTS. 2002. CD-ROM. MADISON, WI.

RAIN-FED MAIZE-SOYBEAN ROTATIONS OF NORTH AMERICA - (Other)

Karlen, D.L. 2004. Rain-fed maize-soybean rotations of North America. Dekker Encyclopedia of Plant and Crop Science. p. 358-362.

TRANSITION STRATEGIES FOR POST-CRP CERTIFIED ORGANIC GRAIN PRODUCTION - (Peer Reviewed Journal)

DELATE, K., CAMBARDELLA, C.A., KARLEN, D.L. TRANSITION STRATEGIES FOR POST-CRP CERTIFIED ORGANIC GRAIN PRODUCTION. CROP MANAGEMENT at www.cropmanagement.org. 2002. Available from: www.cropmanagement.org.

BULK DENSITY AS A SOIL QUALITY INDICATOR DURING CONVERSION TO NO-TILLAGE - (Peer Reviewed Journal)

Logsdon, S.D., Karlen, D.L. 2004. Bulk density as a soil quality indicator during conversion to no-tillage. Soil & Tillage Research. 78:143-149.

CROPPING SYSTEM EFFECTS ON NO3-N LOSS WITH SUBSURFACE DRAINAGE WATER - (Peer Reviewed Journal)

BAKHSH, A., KANWAR, R.S., BAILEY, T.B., CAMBARDELLA, C.A., KARLEN, D.L., COLVIN, T.S. CROPPING SYSTEM EFFECTS ON NO3-N LOSS WITH SUBSURFACE DRAINAGE WATER. TRANSACTIONS OF THE AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS. 2002. V. 45(6). P. 1789-1797.

SURFACE WATER QUALITY RESPONSE TO A NITROGEN FERTILIZER BMP AT THE WATERSHED SCALE - (Abstract Only)

DINNES, D.L., JAYNES, D.B., KARLEN, D.L., MEEK, D.W., CAMBARDELLA, C.A., COLVIN, T.S., HATFIELD, J.L. SURFACE WATER QUALITY RESPONSE TO A NITROGEN FERTILIZER BMP AT THE WATERSHED SCALE. SOIL AND WATER CONSERVATION SOCIETY. 2002. V. 57(5). P. 308.

SPATIAL AND TEMPORAL VARIABILITY IN CORN YIELD GROWN UNDER DIFFERENT TILLAGE SYSTEMS - (Proceedings)

TAPELA, M., COLVIN, T.S., KARLEN, D.L. SPATIAL AND TEMPORAL VARIABILITY IN CORN YIELD GROWN UNDER DIFFERENT TILLAGE SYSTEMS. INTERNATIONAL CONFERENCE ON PRECISION AGRICULTURE ABSTRACTS & PROCEEDINGS. 2002. CD-ROM. MADISON, WI.

SPATIAL AND TEMPORAL VARIABILITY IN CORN YIELD GROWN UNDER DIFFERENT TILLAGE SYSTEMS - (Peer Reviewed Journal)

TAPELA, M., COLVIN, T.S., KARLEN, D.L. SPATIAL AND TEMPORAL VARIABILITY IN CORN YIELD GROWN UNDER DIFFERENT TILLAGE SYSTEMS. PRECISION AGRICULTURE. 2002. CD-ROM. Madison, WI.

SEWAGE SLUDGE AND SOIL SUSTAINABILITY - (Proceedings)

JAWSON, M.D., KARLEN, D.L. SEWAGE SLUDGE AND SOIL SUSTAINABILITY. MEETING ABSTRACT. 2002. P. 7-15.

RELATIONSHIP BETWEEN SIX YEARS OF CORN YIELDS AND TERRAIN ATTRIBUTES - (Peer Reviewed Journal)

KASPAR, T.C., COLVIN, T.S., JAYNES, D.B., KARLEN, D.L., JAMES, D.E., MEEK, D.W., PULIDO, D., BUTLER, H. RELATIONSHIP BETWEEN SIX YEARS OF CORN YIELDS AND TERRAIN ATTRIBUTES. PRECISION AGRICULTURE. 2003. V. 4. P. 87-101.

SOIL QUALITY IN ORGANIC AGRICULTURAL SYSTEMS - (Experiment Station)

DELATE, K., CAMBARDELLA, C.A., KARLEN, D.L. SOIL QUALITY IN ORGANIC AGRICULTURAL SYSTEMS. IOWA COOPERATIVE EXTENSION PUBLICATION. 2002. PM #1882. ISU COOP EXTENSION SERVICE, AMES, IA.

CONSERVATION TILLAGE AND CROPPING INNOVATION: CONSTRUCTING THE NEW CULTURE OF AGRICULTURE (A BOOK REVIEW) - (Other)

KARLEN, D.L., CLEARFIELD, F., NOWAK, P. CONSERVATION TILLAGE AND CROPPING INNOVATION: CONSTRUCTING THE NEW CULTURE OF AGRICULTURE (A BOOK REVIEW). JOURNAL OF SOIL AND WATER CONSERVATION SOCIETY. 2001. V. 56. P. 272-273.

SOIL QUALITY: A BASIS FOR SUSTAINABLE WEED AND INSECT MANAGEMENT - (Peer Reviewed Journal) - (26-Nov-01)

SOIL QUALITY ANALYSES: CAN THEY FIT INTO A SOIL TEST LAB OPERATION? - (Proceedings) - (14-Nov-01)

SWINE MANURE MANAGEMENT CHALLENGES ON TILE-DRAINED SOILS - (Abstract Only)

KARLEN, D.L., CAMBARDELLA, C.A. SWINE MANURE MANAGEMENT CHALLENGES ON TILE-DRAINED SOILS. AMERICAN SOCIETY OF AGRONOMY MEETINGS. 2001. CD-ROM. MADISON, WI.

SPATIAL AND TEMPORAL VARIABILITY OF SOIL CARBON - (Abstract Only)

KASPAR, T.C., PARKIN, T.B., CAMBARDELLA, C.A., KARLEN, D.L., TOMER, M.D. SPATIAL AND TEMPORAL VARIABILITY OF SOIL CARBON. ASA-CSSA-SSSA ANNUAL MEETING ABSTRACTS. 2001. CD-ROM. MADISON, WI.

SOIL QUALITY RESEARCH IN THE U.S.A. - (Proceedings)

KARLEN, D.L., ANDREWS, S.S. SOIL QUALITY RESEARCH IN THE U.S.A. KOREAN SOCIETY OF SOIL SCIENCE AND FERTILIZER CONFERENCE. 2001. P. 39-46.

FINE-TUNING YOUR WRITING - A BOOK REVIEW - (Other)

KARLEN, D.L. FINE-TUNING YOUR WRITING - A BOOK REVIEW. CROP SCIENCE. 2002. V. 42. P. 655-656.

N-MANAGEMENT AND CROP ROTATION EFFECTS ON YIELD AND RESIDUAL SOIL NITRATE LEVELS - (Peer Reviewed Journal)

BAKHSH, A., KANWAR, R.S., KARLEN, D.L., CAMBARDELLA, C.A., BAILEY, T.B., COLVIN, T.S. N-MANAGEMENT AND CROP ROTATION EFFECTS ON YIELD AND RESIDUAL SOIL NITRATE LEVELS. SOIL SCIENCE. 2001. V. 166(8). P. 530-538.

SOIL STRUCTURE AND PLANT ESTABLISHMENT - (Other)

KARLEN, D.L. SOIL STRUCTURE AND PLANT ESTABLISHMENT. ENCYCLOPEDIA OF SOIL SCIENCE. 2002. P. 1269-1272.

ON-FARM ASSESSMENT OF SOIL QUALITY IN CALIFORNIA'S CENTRAL VALLEY - (Peer Reviewed Journal) - (10-Aug-01)

USING FOCUS GROUPS TO DESIGN AN EDUCATIONAL WEBSITE FOR AGRICULTURAL PROFESSIONALS - (Abstract Only)

ANDREWS, S.S., NISSEN, T.M., WANDER, M.M., WALTER, G., CAVANAUGH-GRANT, D., KARLEN, D.L. USING FOCUS GROUPS TO DESIGN AN EDUCATIONAL WEBSITE FOR AGRICULTURAL PROFESSIONALS. AVAILABLE FROM: www.esa.org/meetings. ECOLOGICAL SOCIETY OF AMERICA ABSTRACTS. 2001.

NITROGEN MANAGEMENT STRATEGIES TO REDUCE NITRATE LEACHING IN TILE-DRAINED MIDWESTERN SOILS - (Review Article)

DINNES, D.L., KARLEN, D.L., JAYNES, D.B., KASPAR, T.C., HATFIELD, J.L., COLVIN, T.S., CAMBARDELLA, C.A. NITROGEN MANAGEMENT STRATEGIES TO REDUCE NITRATE LEACHING IN TILE-DRAINED MIDWESTERN SOILS. AGRONOMY JOURNAL. 2002. V. 94. P. 153-171.

SOIL-TEST DYNAMICS THROUGHOUT A FIVE-YEAR "THOMPSON FARM" ROTATION - (Peer Reviewed Journal)

KARLEN, D.L. SOIL-TEST DYNAMICS THROUGHOUT A FIVE-YEAR "THOMPSON FARM" ROTATION. AMERICAN JOURNAL OF ALTERNATIVE AGRICULTURE. 2002. V. 17(1). P. 9-17.

NITRATE LOSS IN SUBSURFACE DRAINAGE AS AFFECTED BY N-FERTILIZER RATE - (Peer Reviewed Journal)

Jaynes, D.B., Colvin, T.S., Karlen, D.L., Cambardella, C.A., Meek, D.W. 2001. Nitrate loss in subsurface drainage as affected by N-fertilizer rate. Journal of Environmental Quality. 30:1305-1314.

PLANT-SOIL-MICROBE N RELATIONSHIPS IN HIGH RESIDUE MANAGEMENT SYSTEMS - (Proceedings)

DINNES, D.L., JAYNES, D.B., KASPAR, T.C., COLVIN, T.S., CAMBARDELLA, C.A., KARLEN, D.L. PLANT-SOIL-MICROBE N RELATIONSHIPS IN HIGH RESIDUE MANAGEMENT SYSTEMS. SOUTH DAKOTA NO TILL ASSOCIATION ANNUAL CONFERENCE. 2001. P. 45-50.

N MANAGEMENT AND HYPOXIA: A RESEARCH FOCUS OF THE USDA-ARS NATIONAL SOIL TILTH LABORATORY - (Abstract Only)

Dinnes, D.L., Jaynes, D.B., Hatfield, J.L., Burkart, M.R., Parkin, T.B., Cambardella, C.A., Karlen, D.L., Colvin, T.S., Kaspar, T.C., James, D.E. 2001. N management and hypoxia: A research focus of the USDA-ARS National Soil Tilth Laboratory. Farm Bureau Members National Convention. American Farm Bureau Federation, Washington, D.C.

SOIL QUALITY: CURRENT CONCEPTS AND APPLICATIONS - (Review Article) - (04-Jan-01)

ESTIMATING SURFACE SOIL ORGANIC CARBON CONTENT AT A REGIONAL SCALE USING THE NATIONAL RESOURCE INVENTORY - (Peer Reviewed Journal) - (21-Dec-00)

VISUAL SOIL ASSESSMENT (A BOOK REVEW) - (Other) - (07-Dec-00)

PRE-CROP HYDROLOGY AND INITIAL RESPONSE OF SOIL QUALITY INDICATORS IN A CONTROLLED RHIZOTRON ENVIRONMENT - (Abstract Only)

Karlen, D.L., Pellack, L.S., Heikens, K.E., Jaynes, D.B. 1999. Pre-crop hydrology and initial response of soil quality indicators in a controlled rhizotron environment [CD-ROM]. ASA-CSSA-SSSA Annual Meeting Abstracts. Madison, Wisconsin.

HISTORICAL OVERVIEW OF SOIL QUALITY - (Abstract Only) - (09-Nov-00)

USING THE WEIGHT-LOSS-ON-IGNITION METHOD TO MEASURE SPATIAL VARIABILITY OF SOIL CARBON - (Abstract Only) - (09-Nov-00)

A COMPARISON OF SOIL QUALITY ASSESSMENT METHODS FOR ORGANIC AMENDMENT PRACTICES IN CALIFORNIA - (Abstract Only) - (09-Nov-00)

COMPARING SOIL QUALITY ASSESSMENT METHODS FOR ORGANIC AMENDMENT PRACTICES IN CALIFORNIA - (Abstract Only) - (09-Nov-00)

REDUCING N CONTAMINATION OF SURFACE WATERS FROM TILE-DRAINED SOILS AT THE WATERSHED SCALE - (Abstract Only)

Dinnes, D.L., Jaynes, D.B., Meek, D.W., Cambardella, C.A., Colvin, T.S., Hatfield, J.L., Karlen, D.L. 2000. Reducing n contamination of surface waters from tile-drained soils at the watershed scale [CD-ROM]. ASA-CSSA-SSSA Annual Meeting Abstracts. Madison, Wisconsin.

A COMPARISON OF SOIL QUALITY INDEXING METHODS FOR VEGETABLE PRODUCTION SYSTEMS IN NORTHERN CALIFORNIA - (Peer Reviewed Journal) - (20-Oct-00)

COMPARING MICROARTHROPOD DIVERSITY AND SOIL QUALITY INDICES IN THREE AGRICULTURAL WATERSHEDS - (Abstract Only)

Andrews, S.S., Hansen, R., Karlen, D.L., Cambardella, C.A., Moorman, T.B. 2000. Comparing microarthropod diversity and soil quality indices in three agricultural watersheds [abstract]. Ecological Society of America Proceedings. Available:www.esa.org/publications.

ESTIMATING CORN YIELD USING SIX YEARS OF YIELD DATA AND TERRAIN ATTRIBUTES - (Proceedings) - (19-Jul-00)

WATERSHED SCALE INTENSIVE NITROGEN FERTILIZER MANAGEMENT REDUCES NITROGEN CONTAMINATION OF SURFACE WATERS - (Abstract Only) - (13-Jul-00)

TILLAGE AND N-MANAGEMENT EFFECTS ON CROP YIELD AND RESIDUAL SOIL NITRATE - (Peer Reviewed Journal)

Bakhsh, A., Kanwar, R.S., Karlen, D.L., Cambardella, C.A., Colvin, T.S., Moorman, T.B., Bailey, T. 2000. Tillage and n-management effects on crop yield and residual soil nitrate. Transactions of the ASAE. 43(6):1589-1595.

AN AUTOREGRESSION MODEL FOR A PAIRED WATERSHED COMPARISON - (Proceedings)

MEEK, D.W., DINNES, D.L., JAYNES, D.B., CAMBARDELLA, C.A., COLVIN, T.S., HATFIELD, J.L., KARLEN, D.L. AN AUTOREGRESSION MODEL FOR A PAIRED WATERSHED COMPARISON. APPLIED STATISTICS IN AGRICULTURE CONFERENCE PROCEEDINGS. 2000. P. 223-231.

IDENTIFICATION OF REGIONAL SOIL QUALITY FACTORS AND INDICATORS: II. NORTHERN MISSISSIPPI LOESS HILLS AND PALOUSE PRAIRIE - (Peer Reviewed Journal) - (12-Jun-00)

AN AUTOREGRESSION MODEL FOR A PAIRED WATERSHED COMPARISON - (Proceedings)

Meek, D.W., Dinnes, D.L., Jaynes, D.B., Cambardella, C.A., Colvin, T.S., Hatfield, J.L., Karlen, D.L. 2000. An autoregression model for a paired watershed comparison. Proceedings of the 12th Applied Statistics In Agriculture Conference. p. 223-231.

VISIONARY LEADERSHIP - (Other) - (24-Apr-00)

THE SOIL QUALITY CONCEPT: A TOOL FOR EVALUATING SUSTAINABILITY - (Proceedings) - (12-Apr-00)

SOIL FERTILITY - PHENOMENON AND CONCEPT - (Peer Reviewed Journal) - (01-Apr-00)

INTENSIVE N FERTILIZER MANAGEMENT EFFECTS ON WATER QUALITY AT THE WATERSHED SCALE - (Abstract Only)

Dinnes, D.L., Jaynes, D.B., Cambardella, C.A., Colvin, T.S., Hatfield, J.L., Karlen, D.L. 2000. Intensive N fertilizer management effects on water quality at the watershed scale. Proceedings of the Watershed Approach to Improving Water Quality: Fact or Fantasy? Soil and Water Conservation Society. p. 95-99.

INTENSIVE N FERTILIZER MANAGEMENT EFFECTS ON WATER QUALITY AT THE WATERSHED SCALE - (Proceedings) - (30-Mar-00)

INTENSIVE NITROGEN FERTILIZER MANAGEMENT EFFECTS ON WATER QUALITY AT THE WATERSHED SCALE - (Abstract Only)

Dinnes, D.L., Jaynes, D.B., Meek, D.W., Cambardella, C.A., Colvin, T.S., Hatfield, J.L., Karlen, D.L. 2000. Intensive nitrogen fertilizer management effects on water quality at the watershed scale. Proceedings of Agriculture and the Environment: A Wake-Up Call for Iowans. Iowa State University Extension, Ames, Iowa.

A SOIL QUALITY INDEX FOR VEGETABLE PRODUCTION IN THE CENTRAL VALLEY - (Abstract Only) - (20-Jan-00)

IDENTIFICATION OF REGIONAL SOIL QUALITY FACTORS AND INDICATORS: I. CENTRAL AND SOUTHERN HIGH PLAINS - (Peer Reviewed Journal) - (29-Nov-99)

RHIZOTRON ASSESSMENT OF SOIL QUALITY INDICATORS - (Abstract Only) - (04-Nov-99)

SOIL QUALITY, YIELD STABILITY, AND ECONOMIC ATTRIBUTES OF ALTERNATIVE CROP ROTATIONS - (Abstract Only) - (04-Nov-99)

A SOIL QUALITY INDEX FOR VEGETABLE PRODUCTION IN CALIFORNIA - (Abstract Only) - (04-Nov-99)

SOIL QUALITY ASSESSMENT AND IMPROVEMENT IN CALIFORNIA'S CENTRAL VALLEY - (Abstract Only) - (04-Nov-99)

INTENSIVE N FERTILIZER MANAGEMENT EFFECTS ON WATER QUALITY AT THE WATERSHED SCALE - (Abstract Only)

Dinnes, D.L., Jaynes, D.B., Cambardella, C.A., Colvin, T.S., Hatfield, J.L., Karlen, D.L. 1999. Intensive n fertilizer management effects on water quality at the watershed scale [CD-ROM]. ASA-CSSA-SSSA Annual Meeting Abstracts. Madison, Wisconsin.

DISTRIBUTION AND VARIABILITY OF SOIL PROPERTIES AT THE REGIONAL SCALE - (Peer Reviewed Journal) - (01-Nov-99)

DISTRIBUTION AND VARIABILITY OF SURFACE SOIL PROPERTIES AT A REGIONAL SCALE - (Peer Reviewed Journal) - (01-Sep-99)

SPLIT APPLICATION NITROGEN FERTILIZER MANAGEMENT EFFECTS ON CORN YIELD AND WATER QUALITY - (Popular Publication)

Dinnes, D.L., Jaynes, D.B., Cambardella, C.A., Colvin, T.S., Hatfield, J.L., Karlen, D.L. 1999. Split application nitrogen fertilizer management effects on corn yield and water quality. Farm Bureau Spokesman Press. 1999 Autumn Harvest Issue. Iowa Farm Bureau, West Des Moines, Iowa.

INDEXING SOIL QUALITY IN CALIFORNIA'S CENTRAL VALLEY - (Abstract Only) - (20-Aug-99)

SOIL QUALITY IN THE DRIFTLESS REGION - (Other) - (03-Aug-99)

SOIL QUALITY ISSUES AND INITIATIVES IN CALIFORNIA'S CENTRAL VALLEY - (Proceedings) - (21-Jun-99)

FIELD-SCALE WATERSHED EVALUATIONS ON DEEP LOESS SOILS: I. TOPOGRAPHY AND AGRONOMIC PRACTICES - (Peer Reviewed Journal)

Karlen, D.L., Kramer, L.A., James, D.E., Buhler, D.D., Moorman, T.B., Burkart, M.R. 1999. Field-scale watershed evaluations on deep loess soils: I. topography and agronomic practices. Journal of Soil and Water Conservation. 54(4):693-703.

VIEWPOINT: OPPORTUNITIES AND CHALLENGES ASSOCIATED WITH WATERSHED-SCALE ASSESSMENTS OF SOIL AND WATER QUALITY - (Other) - (15-Jun-99)

FIELD-SCALE WATERSHED EVALUATIONS ON DEEP LOESS SOILS: III. RAINFALL AND FERTILIZER N USE EFFICIENCIES - (Peer Reviewed Journal)

Logsdon, S.D., Karlen, D.L., Prueger, J.H., Kramer, L.A. 1999. Field-scale watershed evaluations on deep loess soils: III. Rainfall and fertilizer N use efficiencies. Journal of Soil and Water Conservation. 54:711-716.

MODEL-BASED TECHNIQUE TO DETERMINE VARIABLE RATE NITROGEN FOR CORN - (Peer Reviewed Journal)

Paz, J.O., Batchelor, W.D., Babcock, B.A., Colvin, T.S., Logsdon, S.D., Kaspar, T.C., Karlen, D.L. 1999. Model-based technique to determine variable rate nitrogen for corn. Agricultural Systems. 61:69-75.

TILLAGE EFFECTS ON PREVIOUSLY FLOODED SOILS - (Peer Reviewed Journal) - (28-Apr-99)

HERBICIDE TRANSPORT IN SUBSURFACE DRAINAGE WATER LEAVING CORN-SOYBEAN PRODUCTION SYSTEMS - (Book / Chapter) - (27-Apr-99)

CHARACTERIZING THE DISTRIBUTION OF ORGANIC CARBON AND EXTRACTABLE PHOSPHORUS AT A REGIONAL SCALE - (Proceedings) - (27-Apr-99)

ADAPTATION OF SOIL QUALITY INDICES AND APPLICATION TO THREE TILLAGE SYSTEMS IN SOUTHERN ILLINOIS - (Peer Reviewed Journal) - (31-Jan-99)

A SCORESHEET FOR INTERPRETING SOIL QUALITY TEST KIT EVALUATIONS - (Abstract Only) - (21-Jan-99)

EFFECTS OF AN OPTIMUM FERTILIZER PROGRAM ON CORN YIELD AND WATERSHED WATER QUALITY - (Abstract Only) - (12-Jan-99)

ASSESSING SOIL QUALITY ON A REGIONAL SCALE USING THE NATIONAL RESOURCE INVENTORY - (Abstract Only) - (22-Oct-98)

EFFECTS OF LAND USE ON SOIL QUALITY IN THE CENTRAL HIGH PLAINS - (Abstract Only) - (22-Oct-98)

SPATIAL ANALYSIS OF SOIL FERTILITY PARAMETERS - (Peer Reviewed Journal) - (22-Sep-98)

ANALYSIS OF WATER STRESS EFFECTS CAUSING SPATIAL YIELD VARIABILITY IN SOYBEANS - (Peer Reviewed Journal) - (20-Aug-98)

CHLOROPHYLL METER ASSESSMENTS OF CORN RESPONSE TO NITROGEN MANAGEMENT PRACTICES - (Peer Reviewed Journal) - (11-Aug-98)

WATER QUALITY IN WALNUT CREEK WATERSHED: NITRATE-NITROGEN IN SOILS, SUBSURFACE DRAINAGE WATER AND SHALLOW GROUNDWATER - (Peer Reviewed Journal) - (29-Jul-98)

SPATIAL AND TEMPORAL VARIABILITY IN CORN GROWTH, DEVELOPMENT, INSECT PRESSURE, AND YIELD - (Proceedings) - (22-Jul-98)

IMPACT OF SWINE MANURE APPLICATION ON GROUNDWATER QUALITY UNDER CONTINUOUS-CORN AND CORN-SOYBEAN PRODUCTION SYSTEMS - (Proceedings) - (22-Jul-98)

MODEL-BASED TECHNIQUE TO DETERMINE VARIABLE RATE NITROGEN FOR CORN - (Abstract Only) - (22-Jul-98)

ALTERNATIVE N FERTILIZER MANAGEMENT STRATEGIES EFFECTS ON SUBSURFACE DRAIN EFFLUENT AND N UPTAKE - (Peer Reviewed Journal) - (27-May-98)

EFFECTS OF AN OPTIMUM N FERTILIZER PROGRAM ON CORN YIELD AND WATERSHED WATER QUALITY - (Abstract Only) - (06-May-98)

FIELD-SCALE NITROGEN BALANCES ASSOCIATED WITH LONG-TERM CONTINUOUS CORN PRODUCTION - (Peer Reviewed Journal) - (28-Apr-98)

TILLAGE SYSTEM EFFECTS ON 15-YR CARBON-BASED AND SIMULATED N BUDGETS IN A TILE-DRAINED IOWA FIELD - (Peer Reviewed Journal) - (07-Apr-98)

ALTERNATIVE CROPPING SYSTEMS TO IMPROVE THE QUALITY OF SHALLOW GROUNDWATER - (Abstract Only) - (10-Mar-98)

ROTATIONS AND REDUCED TILLAGE: PRACTICES FOR IMPROVING SOIL QUALITY - (Proceedings) - (04-Feb-98)

SOIL QUALITY MONITORING AND ASSESSMENT - (Proceedings) - (31-Jan-98)

CONSERVATION RESERVE PROGRAM EFFECTS ON SOIL QUALITY INDICATORS - (Peer Reviewed Journal) - (25-Nov-97)

REDUCING AGRICULTURE'S CONTRIBUTION TO NITRATE CONTAMINATION OF SURFACE WATERS - (Proceedings) - (18-Nov-97)

WATERSHED SCALE ASSESSMENTS OF SOIL QUALITY AT TWO IOWA LOCATIONS - (Abstract Only) - (31-Oct-97)

EFFECT OF TILLAGE PRACTICES ON SOIL BIOMASS IN POST-CRP LANDS - (Abstract Only) - (31-Oct-97)

INFLUENCE OF NH4-K INTERACTIONS ON NO3 LEACHING - (Abstract Only) - (31-Oct-97)

SPATIAL SCALE REQUIREMENTS FOR PRECISION FARMING INFERRED FROM OBSERVATIONS IN THE SE USA - (Peer Reviewed Journal) - (28-Oct-97)

SPATIAL AND SEASONAL FACTORS AFFECTING CROP YIELD AND N REMOVAL FROM GLACIAL TILL SOILS - (Proceedings) - (10-Sep-97)

SUBSURFACE DRAIN WATER QUALITY AS AFFECTED BY MANURE APPLICATION - (Abstract Only) - (14-Aug-97)

SUBSURFACE DRAIN WATER QUALITY AS AFFECTED BY MANURE APPLICATION - (Other) - (14-Aug-97)

CALIBRATION OF A CROP GROWTH MODEL TO PREDICT SPATIAL YIELD VARIABILITY - (Abstract Only) - (14-Aug-97)

CROPPING SYSTEM EFFECTS ON N REMOVAL, SOIL N, AGGREGATE STABILITY, AND SUBSEQUENT CORN GRAIN YIELD - (Peer Reviewed Journal) - (13-Aug-97)

EFFECT OF INJECT METHOD OF LIQUID MANURE APPLICATION ON CROP YIELD AND NITROGEN CONTAMINATION OF SHALLOW GROUNDWATER - (Proceedings) - (10-Aug-97)

A SOIL QUALITY FRAMEWORK FOR EVALUATING THE IMPACT OF CRP - (Peer Reviewed Journal) - (01-Aug-97)

YIELD VARIABILITY WITHIN A CENTRAL IOWA FIELD - (Peer Reviewed Journal) - (28-Jan-97)

IMPACT OF MANURE AND N-MANAGEMENT SYSTEMS ON WATER QUALITY - (Proceedings) - (20-Nov-96)

SPATIAL VARIABILITY ANALYSIS: A FIRST STEP IN SITE-SPECIFIC MANAGEMENT - (Proceedings) - (20-Nov-96)

WATERSHED-SCALE ASSESSMENT OF SOIL BIOCHEMICAL PROPERTIES: A PRELUDE TO SOIL QUALITY - (Abstract Only) - (08-Nov-96)

A CONCEPTUAL FRAMEWORK FOR ASSESSMENT AND MANAGEMENT OF SOIL QUALITY AND HEALTH - (Book / Chapter) - (15-Aug-96)

QUANTIFICATION OF SOIL QUALITY - (Proceedings) - (26-Jul-96)

ENHANCING CARBON SEQUESTRATION IN CRP-MANAGED LAND - (Proceedings) - (26-Jul-96)

THE EVOLVING SCIENCE OF SOIL QUALITY - (Proceedings) - (25-Jul-96)

SOIL-TEST VARIABILITY IN ADJACENT IOWA FIELDS - (Proceedings) - (26-Jun-96)

ECONOMIC OPPORTUNITY IN YIELD VARIABILITY WITHIN A CENTRAL IOWA FIELD - (Abstract Only) - (26-Jun-96)

SIX YEAR YIELD VARIABILITY WITHIN A CENTRAL IOWA FIELD - (Abstract Only) - (26-Jun-96)

SOIL PROPERTY CONTRIBUTIONS TO YIELD VARIATION PATTERNS - (Abstract Only) - (26-Jun-96)

SOIL PROPERTY CONTRIBUTIONS TO YIELD VARIATION PATTERNS - (Proceedings) - (26-Jun-96)

SOIL QUALITY: A CONCEPT, DEFINITION, AND FRAMEWORK FOR EVALUATION - (Peer Reviewed Journal) - (10-Jun-96)

IMPACT OF CRP ON SOIL QUALITY - (Book / Chapter) - (01-Jun-96)

RUNOFF, EROSION, AND SOIL QUALITY CHARACTERISTICS OF A FORMER CRP SITE IN SOUTHWESTERN IOWA - (Peer Reviewed Journal) - (15-Mar-96)

SOIL QUALITY AND SOIL HEALTH: PERSPECTIVES FOR CONSULTANTS - (Proceedings) - (14-Feb-96)

FERTILIZER 15N RECOVERY WITHIN A TWO-YEAR CORN, WHEAT, AND COTTON ROTATION - (Peer Reviewed Journal) - (05-Dec-95)

IMPACT OF CRP ON SOIL QUALITY INDICATORS - (Abstract Only) - (03-Nov-95)

THE SANREM APPROACH FOR SELECTING INDICATORS OF SUSTAINABILITY - (Proceedings) - (29-Sep-95)

CHANGES IN SOIL CHARACTERISTICS AS INFLUENCED BY DIFFERING LONG-TERM TILLAGE PRACTICES - (Abstract Only) - (15-Aug-95)

CRP EFFECTS ON SOIL QUALITY INDICATORS AT SELECTED IOWA LOCATIONS - (Proceedings) - (08-Jun-95)

NITROGEN MANAGEMENT SYSTEMS FOR SUSTAINABLE CROP PRODUCTION AND WATER QUALITY ENHANCEMENT - (Proceedings) - (15-Jan-95)

SWINE MANURE AND N-MANAGEMENT SYSTEMS: IMPACT ON GROUNDWATER QUALITY - (Proceedings) - (05-Jan-95)

TILLAGE AND CROP ROTATION EFFECTS ON DRAINAGE WATER QUALITY - (Proceedings) - (05-Jan-95)

A SYSTEMS APPROACH: THE KEY TO SUSTAINABILITY - (Abstract Only) - (07-Dec-94)

SOIL QUALITY RESEARCH AT THE NATIONAL SOIL TILTH LABORATORY - (Abstract Only) - (05-Aug-94)