Projects

ENHANCED MIDWESTERN CROPPING SYSTEMS FOR SUSTAINABILITY AND ENVIRONMENTAL QUALITY Appropriated (D)   Accession Number: 414264

REDUCING NITRATE LOSSES FROM AGRICULTURAL FIELDS WITH SUBSURFACE DRAINAGE Appropriated (D)   Accession Number: 411511

WATER QUALITY IMPROVEMENT FROM MANAGEMENT PRACTICES IN AGRICULTURAL WATERSHEDS Appropriated (D)   Accession Number: 411795

EVALUATION OF CROP YIELD VARIABILITY ACROSS CROP PRODUCTION FIELDS IN CENTRAL IOWA Specific Cooperative Agreement (S)   Accession Number: 414249

Publications

Winter Cover Crop Effects on Nitrate Leaching in Subsurface Drainage as Simulated by RZWQM-DSSAT - (Peer Reviewed Journal) - (10-Sep-08)

Agricultural Drainage Water Management in the Upper Mississippi River Basin: Potential Impact and Implementation Strategies - (Abstract)

Fausey, N.R., Pitts, D., Jaynes, D.B. 2008. Agricultural Drainage Water Management in the Upper Mississippi River Basin: Potential Impact and Implementation Strategies. Nonpoint Source Water Quality Monitoring Results Workshop. Meeting Abstract.

Simulated Effects of Nitrogen Management and Soil Microbes on Soil Nitrogen Balance and Crop Production - (Peer Reviewed Journal)

Ma, L., Malone, R.W., Jaynes, D.B., Thorp, K.R., Ahuja, L.R. 2008. Simulated Effects of Nitrogen Management and Soil Microbes on Soil Nitrogen Balance and Crop Production. Soil Science Society of America Journal. 72:1594-1603.

Simulating Long-Term Performance of Drainage Water Management Across the Midwestern United States - (Peer Reviewed Journal)

Thorp, K.R., Jaynes, D.B., Malone, R.W. 2008. Simulating long-term performance of drainage water management across the midwestern United States. Transactions of the ASABE. 51(3):961-976.

Mapping Pesticide Partition Coefficients By Electromagnetic Induction - (Book/Chapter)

Jaynes, D.B. 2008. Mapping Pesticide Partition Coefficients By Electromagnetic Induction. In: Allred, B.J., Daniels, J.J., Ehsani, M.R., editors. Handbook of Agricultural Geophysics. Boca Raton, FL: CRC Press. p. 233-240.

The Extent of Cropland Drainage in the United States - (Abstract)

Jaynes, D.B., James, D.E. 2007. The Extent of Cropland Drainage in the United States [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 4-8, 2007, New Orleans, LA.

Using RZWQM-DSSAT to Stimulate Drainage Water Management Across the United States Corn Belt - (Abstract)

Thorp, K.R., Jaynes, D.B. 2007. Using RZWQM-DSSAT to Stimulate Drainage Water Management Across the United States Corn Belt [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 4-8, 2007, New Orleans, LA.

Simulated long-term nitrogen losses for a midwestern agricultural watershed in the United States - (Peer Reviewed Journal)

Gowda, P., Mulla, D.J., Jaynes, D.B. 2008. Simulated long-term nitrogen losses for a midwestern agricultural watershed in the United States. Agricultural Water Management. 95:616-624.

Potential Methods for Reducing Nitrate Losses in Artificially Drained Fields - (Peer Reviewed Journal)

Jaynes, D.B., Kaspar, T.C., Moorman, T.B., Parkin, T.B. 2008. Potential Methods for Reducing Nitrate Losses in Artificially Drained Fields. Journal of Environmental Quality. 37:429-436.

Economic and Environmental Impacts of Selected Bmp's for Nitrate-Nitrogen Reduction in Walnut Creek Watershed, Iowa, Using Fem (Farm Economic Model) and Enhanced Swat (Soil and Water Assessment Tool) Models - (Peer Reviewed Journal)

Saleh, A., Osei, E., Jaynes, D.B., Du, B., Arnold, J.G. 2007. Economic and environmental impacts of selected BMP's for nitrate-nitrogen reduction in Walnut Creek Watershed, Iowa, using FEM (farm economic model) and enhanced SWAT (soil and water assessment tool) models. Transactions of the ASABE. 50(4):1251-1259.

Simulating long-term effects of nitrogen fertilizer application rates on corn yield and nitrogen dynamics - (Peer Reviewed Journal)

Thorp, K.R., Malone, R.W., Jaynes, D.B. 2007. Simulating long-term effects of nitrogen fertilizer application rates on corn yield and nitrogen dynamics. Transactions of the ASABE. 50(4):1287-1303.

Rye Cover Crop and Gamagrass Strip Effects on NO3 Concentration and Load in Tile Drainage - (Peer Reviewed Journal)

Kaspar, T.C., Jaynes, D.B., Parkin, T.B., Moorman, T.B. 2007. Rye Cover Crop and Gamagrass Strip Effects on NO3 Concentration and Load in Tile Drainage. Journal of Environmental Quality. 36(5):1503-1511.

Modeling Biochemical Impacts of Alternative Management Practices for a Row-Crop Field in Iowa - (Peer Reviewed Journal)

Farahbakhshazad, N., Dinnes, D.L., Li, C., Jaynes, D.B., Salas, W. 2008. Modeling Biochemical Impacts of Alternative Management Practices for a Row-Crop Field in Iowa. Agriculture, Ecosystems and Environment. 123(1-3):30-48.

Surface and Subsurface Solute Transport Properties at Row and Inter-Row Positions - (Peer Reviewed Journal)

Gaur, A., Jaynes, D.B., Horton, R., Ochsner, T.E. 2007. Surface and Subsurface Solute Transport Properties at Row and Inter-Row Positions. Soil Science. 172(6):419-431.

Understanding Nutrient Fate and Transport, Including the Importance of Hydrology in Determining Field Losses, and Potential Implications on Management Systems to Reduce Those Losses - (Proceedings/Symposium)

Baker, J.L., David, M.B., Lemke, D.W., Jaynes, D.B. 2008. Understanding Nutrient Fate and Transport, Including the Importance of Hydrology in Determining Field Losses, and Potential Implications on Management Systems to Reduce Those Losses. In: Final Report: Gulf Hypoxia and Local Water Quality Concerns Workshop. p. 1-17.

In-Field Bioreactor for Removing Nitrate from Tile Drainage - (Abstract)

Jaynes, D.B., Kaspar, T.C., Moorman, T.B., Parkin, T.B. 2006. In-Field Bioreactor for Removing Nitrate from Tile Drainage [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 12-16, 2006, Indianapolis, IN.

Using RZWQM and Drainmod NII to Simulate Drainage Water Management in Iowa - (Abstract)

Thorp, K.R., Jaynes, D.B., Malone, R.W. 2006. Using RZWQM and Drainmod NII to Simulate Drainage Water Management in Iowa [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 12-16, 2006, Indianapolis, IN.

Field Measurement of Soil Surface Chemical Transport Properties for Comparison of Management Zones - (Peer Reviewed Journal)

Heitman, J.L., Gaur, A., Horton, R., Jaynes, D.B., Kaspar, T.C. 2007. Field Measurement of Soil Surface Chemical Transport Properties for Comparison of Management Zones. Soil Science Society of America Journal. 71(2):529-536.

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.

Drainage Water Management for the Midwest - (Experiment Station)

Frankenberger, J., Kladivko, E., Sands, G., Jaynes, D.B., Fausey, N.R., Helmers, M., Cooke, R., Strock, J., Nelson, K., Brown, L. Drainage Water Management for the Midwest. Purdue Extension, Knowledge to Go. WQ-44. p. 1-8.

Rzwqm Simulated Effects of Crop Rotation, Tillage, and Controlled Drainage on Crop Yield and Nitrate-N Loss in Drain Flow. - (Peer Reviewed Journal)

Ma, L., Malone, R.W., Heilman, P., Jaynes, D.B., Ahuja, L.R., Saseendran, S.A., Kanwar, R.S., Ascough II, J.C. 2007. RZWQM simulated effects of crop rotation, tillage, and controlled drainage on crop yield and nitrate-n loss in drain flow. Geoderma 140(3):260-271. doi:10/1016/j/geoderma.2007.04.010.

Corn Yield and Nitrate Loss in Subsurface Drainage from Mid-Season N Fertilizer Application - (Peer Reviewed Journal)

Jaynes, D.B., Colvin, T.S. 2006. Corn yield and nitrate loss in subsurface drainage from mid-season N fertilizer application. Agronomy Journal. 98:1479-1487.

Evaluation of Swat in Simulating Nitrate Nitrogen and Atrazine Fates in a Watershed with Tiles and Potholes - (Peer Reviewed Journal)

Du, B., Saleh, A., Jaynes, D.B., Arnold, J.G. 2006. Evaluation of SWAT in Simulating Nitrate Nitrogen and Atrazine Fates in a Watershed with Tiles and Potholes. Transactions of the ASABE. 49(4):949-959.

Application of the Annagnps Model to the Walnut Creek, Ia Ceap Benchmark Watershed - (Abstract)

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.

Quantifying Pore Size Spectrum of Macropore-Type Preferential Pathways under Transient Flow - (Peer Reviewed Journal)

Kung, K., Kladivko, E., Helling, C.S., Gish, T.J., Steenhuis, T.S., Jaynes, D.B. 2006. Quantifying pore size spectrum of macropore-type preferential pathways under transient flow. Vadose Zone Journal. 5:978-989.

Measured and Predicted Solute Transport in a Tile Drained Field - (Peer Reviewed Journal)

Gaur, A., Horton, R., Jaynes, D.B., Baker, J.L. 2006. Measured and predicted solute transport in a tile drained field. Soil Science Society of America Journal. 70:872-881.

Examining Changes in Soil Organic Carbon with Oat and Rye Cover Crops Using Terrain Covariates - (Peer Reviewed Journal)

Kaspar, T.C., Parkin, T.B., Jaynes, D.B., Cambardella, C.A., Meek, D.W., Jung, Y.S. 2006. Examining changes in soil organic carbon with oat and rye cover crops using terrain covariates. Soil Science Society of America Journal. 70:1168-1177.

Nitrate Loss in Subsurface Drainage from Mid-Season N Fertilizer Application - (Abstract)

Jaynes, D.B., Colvin, T.S. 2005. Nitrate Loss in Subsurface Drainage from Mid-Season N Fertilizer Application [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 6-10, 2005, Salt Lake City, UT.

Translating Agricultural Water Quality Research Results into a Format for Policymakers to Use - (Abstract)

Dinnes, D.L., Jaynes, D.B., Hatfield, J.L. 2005. Translating agricultural water quality research results into a format for policymakers to use [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 6-10, 2005, Salt Lake City, UT.

Effects of a Rye Cover Crop and a Permanent Gamagrass Strip on Nitrate Load in Tile Drainage - (Abstract)

Kaspar, T.C., Jaynes, D.B., Parkin, T.B., Moorman, T.B. 2005. Effects of a rye cover crop and a permanent gamagrass strip on nitrate load in tile drainage [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts. Nov. 6-10, 2005, Salt Lake City, UT.

Modeling Precision Agriculture for Better Crop Productivity and Environmental Quality - (Peer Reviewed Journal)

Bakhsh, A., Kanwar, R., Jaynes, D.B., Colvin, T.S., Ahuja, L.R. 2005. Modeling precision agriculture for better crop productivity and environmental quality. Asian Association for Agricultural Engineering. 14(4):235-243.

Comparing Carbon Substrates for Denitrification of Subsurface Drainage Water - (Peer Reviewed Journal)

Greenan, C.M., Moorman, T.B., Kaspar, T.C., Parkin, T.B., Jaynes, D.B. 2006. Comparing carbon substrates for denitrification of subsurface drainage water. Journal of Environmental Quality. 35:824-829.

Sustaining Soil Resources While Managing Nutrients - (Proceedings/Symposium)

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.

Nitrate Losses in Tile Drainage from Mid-Season N-Fertilizer - (Abstract)

Jaynes, D.B., Colvin, T.S. 2005. Nitrate Losses in Tile Drainage from Mid-Season N-Fertilizer [abstract]. American Society of Agricultural Engineers. Paper No. 052028.

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.

Modeling Nitrate Leaching with a Biogeochemical Model Modified Based on Observations in a Row-Crop Field in Iowa - (Peer Reviewed Journal)

Li, C., Farahbakhshazad, N., Jaynes, D.B., Dinnes, D.L., Salas, W., Mclaughlin, D. 2006. Modeling nitrate leaching with a biogeochemical model modified based on observations in a row-crop field in Iowa. Ecological Modeling. 196:116-130.

Evaluation of Swat in Simulating Atrazine Losses in Stream Discharge for Walnut Creek Watershed (Iowa) - (Abstract)

Du, B., Saleh, A., Jaynes, D.B., Arnold, J.G. 2005. Evaluation of SWAT in simulating atrazine losses in stream discharge for Walnut Creek watershed (Iowa) [CD-ROM]. Watershed Management Conference Proceedings. Atlanta, Georgia.

Effect of the Accuracy of Spatial Rainfall Information on the Modeling of Water, Sediment, and No3-N Loads at the Watershed Level - (Peer Reviewed Journal)

Chaplot, V., Saleh, A., Jaynes, D.B. 2005. No-till corn response to banded K on Des Moines lobe soils. Journal of Hydrology. 312(1-4):223-234.

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.

Quantifying Pore Size Spectrum of Macropore-Type Preferential Pathways - (Peer Reviewed Journal)

Kung, K.S., Hanke, M., Helling, C.S., Kladivko, E.J., Gish, T.J., Steenhuis, T.S., Jaynes, D.B. 2005. Quantifying pore size spectrum of macropore-type preferential pathways. Soil Science Society of America Journal, 69:1196-1208.

A Dripper-Tdr Method for Insitu Determination of Hydraulic Conductivity and Chemical Transport Properties of Surface Soils - (Peer Reviewed Journal)

Al-Jabri, S.A., Lee, J., Gaur, A., Horton, R., Jaynes, D.B. 2006. A dripper-TDR method for insitu determination of hydraulic conductivity and chemical transport properties of surface soils. Advances in Water Resources. 29(2):239-249.

The Effects of N-Fertilizer Practices on the Water Quality of Walnut Creek, Iowa - (Abstract)

Jaynes, D.B., Dinnes, D.L., Hatfield, J.L., Saleh, A., Arnold, J.G. 2004. The Effects of N-Fertilizer Practices on the Water Quality of Walnut Creek, Iowa [CD-ROM]. ASA-CSSA-SSSA Annual Meeting Abstracts. Madison, Wisconsin.

Soil, Wheat, and Sorghum Response to Tillage under Rhizotron Conditions - (Abstract)

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.

Soil Surface Hydraulic and Chemical Transport Properties - (Abstract)

Gaur, A., Heitman, J., Horton, R., Jaynes, D.B. 2004. Soil Surface Hydraulic and Chemical Transport Properties [CD-ROM]. ASA-CSSA-SSSA Annual Meeting Abstracts. Madison, Wisconsin.

Identifying Spatial Patterns of Erosion for Use in Precision Conservation - (Abstract)

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.

Development of Nitrogen Response Curves Using Field Scale Data and Data Mining - (Abstract)

Chaudhary, A., Colvin, T.S., Jaynes, D.B., Kaspar, T.C. 2004. Development of nitrogen response curves using field scale data and data mining. International Conference on Precision Agriculture Abstracts & Proceedings. [CD-ROM]. Madison, WI.

Nitrate Leaching to Subsurface Drains As Affected by Drain Spacing and Changes in Crop Production System - (Peer Reviewed Journal)

Kladivko, E.J., Frankenberger, J.R., Jaynes, D.B., Meek, D.W., Jenkinson, B.J., Fausey, N.R. 2004. Nitrate Leaching to Subsurface Drains as Affected by Drain Spacing and Changes in Crop Production System. Journal of Environmental Quality. 33(5):1803-1813.

Potential Methods for Reducing Nitrate Losses in Artificially Drained Fields - (Proceedings/Symposium)

Jaynes, D.B., Kaspar, T.C., Moorman, T.B., Parkin, T.B. 2004. Potential methods for reducing nitrate losses in artificially drained fields. International Drainage Symposium. VIII:p. 59-69.

Beyond Fertilizer Management: in-Field Approaches for Reducing Nitrate Loads Coming from Agricultural Drainage Tiles - (Abstract)

Kaspar, T.C., Jaynes, D.B., Parkin, T.B., Moorman, T.B. 2004. Beyond fertilizer management: in-field approaches for reducing nitrate loads coming from agricultural drainage tiles [abstract]. Final Program Book of Abstracts, The Ninth Biennial Conference Minnesota Water 2004: Policy and Planning to Ensure Minnesota's Water Supplies. Minneapolis, MN. p. 70.

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.

Predicting Water, Sediment and No3-N Loads under Scenarios of Land-Use and Management Practices in a Flat Watershed - (Peer Reviewed Journal)

Chaplot, V., Saleh, A., Jaynes, D.B., Arnold, J.G. 2004. Predicting water, sediment and NO3-N loads under scenarios of land-use and management practices in a flat watershed. Journal of Water Air and Soil Pollution. 154(1-4):271-293.

Identifying Potential Soybean Management Zones from Multi-Year Yield Data - (Peer Reviewed Journal)

Jaynes, D.B., Kaspar, T.C., Colvin, T.S., 2005. Identifying potential soybean management zones from multi-year yield data. Computers in Agriculture. 46(1-3):309-327.

Evaluation of Swat on Modeling Nitrate-Nitrogen in Soil Profile and Stream Discharge for Walnut Creek Watershed with Tile and Pothole - (Proceedings/Symposium)

BING, D., SALEH, A., ARNOLD, J.G., JAYNES, D.B. EVALUATION OF SWAT ON MODELING NITRATE-NITROGEN IN SOIL PROFILE AND STREAM DISCHARGE FOR WALNUT CREEK WATERSHED WITH TILE AND POTHOLE. WATER MANAGEMENT TO MEET EMERGING TMDL ENVIRONMENTAL REGULATIONS CONFERENCE. 2003. CD-ROM. ST. JOSEPH, MI. AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS.

Application of Soil and Water Assessment Tool (Swat) to Landscapes with Tiles and Potholes. Part Ii. Validation of New Procedures. Case of Walnut Creek Watershed (Iowa) - (Proceedings/Symposium)

BING, D., SALEH, A., ARNOLD, J.G., JAYNES, D.B. 2003. APPLICATION OF SOIL AND WATER ASSESSMENT TOOL (SWAT) TO LANDSCAPES WITH TILES AND POTHOLES. PART II. VALIDATION OF NEW PROCEDURES. CASE OF WALNUT CREEK WATERSHED (IOWA). ASAE ANNUAL INTERNATIONAL MEETING. AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS. PAPER NO. 032164.

State-Space Analysis of Thermal Diffusivity During Water Percolation in a Field Soil - (Abstract)

JAYNES, D.B., WENDROTH, O., NIELSEN, D.R. STATE-SPACE ANALYSIS OF THERMAL DIFFUSIVITY DURING WATER PERCOLATION IN A FIELD SOIL. ASA-CSSA-SSSA ANNUAL MEETING ABSTRACTS. 2003. CD-ROM. MADISON, WI.

Corn Soybean Yield Zones from Cluster Analysis of Multi-Year Yield Data - (Abstract)

JAYNES, D.B., KASPAR, T.C., COLVIN, T.S. CORN SOYBEAN YIELD ZONES FROM CLUSTER ANALYSIS OF MULTI-YEAR YIELD DATA. ASA-CSSA-SSSA ANNUAL MEETING ABSTRACTS. 2003. CD-ROM. MADISON, WI.

Surface Solute Transport Properties and Subsurface Chemical Leaching in a Tile Drained Field - (Abstract)

GAUR, A., HORTON, R., JAYNES, D.B. SURFACE SOLUTE TRANSPORT PROPERTIES AND SUBSURFACE CHEMICAL LEACHING IN A TILE DRAINED FIELD. ASA-CSSA-SSSA ANNUAL MEETING ABSTRACTS. 2003. CD-ROM. MADISON, WI.

Stimulation of Denitrification and Nitrate Removal from Subsurface Drainage Water - (Abstract)

MOORMAN, T.B., PARKIN, T.B., JAYNES, D.B., KASPAR, T.C. STIMULATION OF DENITRIFICATION AND NITRATE REMOVAL FROM SUBSURFACE DRAINAGE WATER. ASA-CSSA-SSSA ANNUAL MEETING ABSTRACTS. 2003. CD-ROM. MADISON, WI.

Changes in Soil Carbon Response to Year, Previous Crop, and Cover Crop - (Abstract)

KASPAR, T.C., PARKIN, T.B., JAYNES, D.B. CHANGES IN SOIL CARBON RESPONSE TO YEAR, PREVIOUS CROP, AND COVER CROP. ASA-CSSA-SSSA ANNUAL MEETING ABSTRACTS. 2003. CD-ROM. MADISON, WI.

Nutrient and Herbicide Movement in Streamflow from Two Midwestern Watersheds - (Proceedings/Symposium)

ALBERTS, E.E., JAYNES, D.B., LERCH, R.N. NUTRIENT AND HERBICIDE MOVEMENT IN STREAMFLOW FROM TWO MIDWESTERN WATERSHEDS. PROCEEDINGS OF FIRST INTERAGENCY CONFERENCE ON RESEARCH IN THE WATERSHEDS. 2003. UNITED STATES DEPARTMENT OF AGRICULTURE. AGRICULTURAL RESEARCH SERVICE. WASHINGTON, D.C. P. 385-390 CDROM.

Evaluation of the Accuracy of a Central Iowa Soil Survey and Implications for Precision Soil Management - (Peer Reviewed Journal)

BREVIK, E.C., FENTON, T.E., JAYNES, D.B. EVALUATION OF THE ACCURACY OF A CENTRAL IOWA SOIL SURVEY AND IMPLICATIONS FOR PRECISION SOIL MANAGEMENT. PRECISION AGRICULTURE. 2003. V. 4(3). P. 331-342.

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.

Denitrification-Based Removal of Nitrate from Subsurface Drainage Water - (Abstract) - (14-May-03)

Using Surface Time Domain Reflectometry Measurements to Estimate Subsurface Chemical Movement - (Peer Reviewed Journal)

GAUR, A., HORTON, R., JAYNES, D.B., JACOBSON, L., AL-JABRI, S.A. USING SURFACE TIME DOMAIN REFLECTOMETRY MEASUREMENTS TO ESTIMATE SUBSURFACE CHEMICAL MOVEMENT. VADOSE ZONE JOURNAL. 2003. V. 2. P. 539-543.

Evaluation of Nitrate-N Fluxes from a Tile-Drained Watershed - (Proceedings/Symposium)

TOMER, M.D., MEEK, D.W., JAYNES, D.B., HATFIELD, J.L. EVALUATION OF NITRATE-N FLUXES FROM A TILE-DRAINED WATERSHED. PROCEEDINGS OF THE TMDL SCIENCE ISSUES CONFERENCE. 2002. CD-ROM. Alexandria, VA.

Use of Near-Surface Tdr Measurements to Predict Subsurface Solute Transport - (Abstract)

GAUR, A., HORTON, R., JAYNES, D.B. USE OF NEAR-SURFACE TDR MEASUREMENTS TO PREDICT SUBSURFACE SOLUTE TRANSPORT. SOIL SCIENCE SOCIETY OF AMERICA ANNUAL MEETING. 2002. CD-ROM. MADISON, WI.

Corn Response to Nitrogen Across Landscape Positions - (Abstract)

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.

Evaluation of Nitrate-N Fluxes from a Tile-Drained Watershed in Central Iowa - (Other)

Tomer, M.D., Meek, D.W., Jaynes, D.B., Hatfield, J.L. 2003. Evaluation of nitrate-n fluxes from a tile-drained watershed in central Iowa. Journal of Environmental Quality. Poster No. 19.

Evaluation of Nitrate-N Fluxes from a Tile-Drained Watershed in Central Iowa - (Peer Reviewed Journal)

TOMER, M.D., MEEK, D.W., JAYNES, D.B., HATFIELD, J.L. EVALUATION OF NITRATE-N FLUXES FROM A TILE-DRAINED WATERSHED IN CENTRAL IOWA. JOURNAL OF ENVIRONMENTAL QUALITY. 2003. V. 32. P. 642-653.

Nitrogen Fertilizer Effects on Soil Organic Carbon Dynamics in Corn-Soybean Agroecosystems - (Abstract)

RUSSELL, A.E., CAMBARDELLA, C.A., LAIRD, D.A., JAYNES, D.B., COLVIN, T.S., MEEK, D.W. NITROGEN FERTILIZER EFFECTS ON SOIL ORGANIC CARBON DYNAMICS IN CORN-SOYBEAN AGROECOSYSTEMS. ECOLOGICAL SOCIETY OF AMERICA PROCEEDINGS. 2002. AVAILABLE FROM: www:esa.org/publications.

Subsurface Drainage Modifications to Reduce Nitrate Losses in Drainage - (Proceedings/Symposium)

JAYNES, D.B., KASPAR, T.C., MOORMAN, T.B., PARKIN, T.B. SUBSURFACE DRAINAGE MODIFICATIONS TO REDUCE NITRATE LOSSES IN DRAINAGE. ASAE ANNUAL INTERNATIONAL MEETING. 2002. PAPER NO. 02-2015.

Modeling Long-Term Nitrogen Losses in Walnut Creek Watershed, Iowa - (Proceedings/Symposium)

GOWDA, P.H., MULLA, D.J., JAYNES, D.B. MODELING LONG-TERM NITROGEN LOSSES IN WALNUT CREEK WATERSHED, IOWA. ASAE ANNUAL INTERNATIONAL MEETING. 2002. PAPER NO. 02-2134.

Comparison of Techniques for Defining Yield Potential Zones in An Iowa Field - (Proceedings/Symposium)

JAYNES, D.B., KASPAR, T.C., COLVIN, T.S. COMPARISON OF TECHNIQUES FOR DEFINING YIELD POTENTIAL ZONES IN AN IOWA FIELD. INTERNATIONAL CONFERENCE ON PRECISION AGRICULTURE ABSTRACTS & PROCEEDINGS. 2002. CD-ROM. MADISON, WI: ASA-CSSA-SSA.

Surface Water Quality Response to a Nitrogen Fertilizer Bmp at the Watershed Scale - (Abstract)

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.

Characterization of Water and Nitrate Fluxes from a Tile-Drained Watershed - (Abstract)

TOMER, M.D., JAYNES, D.B., HATFIELD, J.L., COLE, K.J., DINNES, D.L., JAQUIS, R.J. CHARACTERIZATION OF WATER AND NITRATE FLUXES FROM A TILE-DRAINED WATERSHED. SOIL AND WATER CONSERVATION SOCIETY. 2002. V. 57(5). P. 325.

A Site-Specific Evaluation of a Crop-Denitrification/decomposition Model Based Upon a Us Midwestern Row-Crop Field - (Proceedings/Symposium)

FARAHBAKHSHAZAD, N., MCLAUGHLIN, D., DINNES, D.L., JAYNES, D.B., LI, C. A SITE-SPECIFIC EVALUATION OF A CROP-DENITRIFICATION/DECOMPOSITION MODEL BASED UPON A US MIDWESTERN ROW-CROP FIELD. INTERNATIONAL CONFERENCE ON PRECISION AGRICULTURE ABSTRACTS & PROCEEDINGS. 2002. CD-ROM. Madison, WI: ASA-CSSA-SSSA.

Field Determination of Soil Hydraulic and Chemical Transport Properties - (Peer Reviewed Journal)

AL-JABRI, S.A., HORTON, R., JAYNES, D.B., GAUR, A. FIELD DETERMINATION OF SOIL HYDRAULIC AND CHEMICAL TRANSPORT PROPERTIES. SOIL SCIENCE. 2002. V. 167(2). P. 353-367.

6.5 Solute Transport: Data Analysis and Parameter Estimation - (Book/Chapter)

Skaggs, T.H., Jaynes, D.B., Kachanoski, R.G., Shouse, P.J., Ward, A.L. 2002. 6.5 solute transport: data analysis and parameter estimation. In. J.H. Dane and G.C. Topp. (eds). Methods of Soil Analysis. Part 4 Physical Methods. Soil Science of America, Madison, WI. Chapter 6.5. p. 1403-1434.

Soil Water Hysteresis - (Book/Chapter)

JAYNES, D.B. SOIL WATER HYSTERESIS. ENCYCLOPEDIA OF WATER SCIENCE. 2003. P.882-884.

An Autoregression Model for a Paired Watershed Comparison - (Proceedings/Symposium)

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.