Skip to main content
ARS Home » Midwest Area » Ames, Iowa » National Laboratory for Agriculture and The Environment » Agroecosystems Management Research » People & Locations » Thomas Kaspar (Tom)
Thomas C Kaspar (Tom)
Agroecosystems Management Research
Plant Physiologist

Phone: (515) 294-8873
Fax: (515) 294-8125
Room 238

1015 N. University Blvd.
NLAE
AMES , IA 500113120
Projects
Coordinated Network of Sites for Studying the Impacts of 4R Nitrogen Management on Crop Production and Nutrient Loss
Trust Fund Cooperative Agreement (T)
  Accession Number: 431941

Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Corn stover harvest and N losses in central Iowa Reprint Icon - (Peer Reviewed Journal)
Malone, R.W., Herbstritt, S., Ma, L., Richard, T., Cibin, R., Gassman, P., Zhang, H., Karlen, D.L., Hatfield, J.L., Obrycki, J., Helmers, M., Jaynes, D.B., Kaspar, T.C., Parkin, T.B. 2019. Corn stover harvest and N losses in central Iowa. Science of the Total Environment. 663:776-792. https://doi.org/10.1016/j.scitotenv.2019.01.328.
Effects of fungicide seed treatments and a winter cereal rye cover crop in no till on the seedling disease complex in corn Reprint Icon - (Peer Reviewed Journal)
Acharya, J., Bakker, M.G., Moorman, T.B., Kaspar, T.C., Lenssen, A.W., Robertson, A.E. 2018. Effects of fungicide seed treatments and a winter cereal rye cover crop in no till on the seedling disease complex in corn. Canadian Journal of Plant Pathology. 40(4):481-497. https://doi.org/10.1080/07060661.2018.1506503.
Rye cover crop increases earthworm populations and reduces losses of broadcast, fall-applied, fertilizers in surface runoff - (Peer Reviewed Journal)
Korucu, T., Shipitalo, M.J., Kaspar, T.C. 2018. Rye cover crop increases earthworm populations and reduces losses of broadcast, fall-applied, fertilizers in surface runoff. Soil & Tillage Research. 180:99-106. https://doi.org/10.1016/j.still.2018.03.004.
Harvesting fertilized rye cover crop: simulated revenue, net energy, and drainage Nitrogen loss Reprint Icon - (Peer Reviewed Journal)
Malone, R.W., Obrycki, J., Karlen, D.L., Ma, L., Kaspar, T.C., Jaynes, D.B., Parkin, T.B., Lence, S., Feyereisen, G.W., Fang, Q., Richards, T.L., Gillette, K.L. 2018. Harvesting fertilized rye cover crop: simulated revenue, net energy, and drainage Nitrogen loss. Agricultural and Environmental Letters. 3:170041. https://doi.org/10.2134/ael2017.11.0041.
Disease risks associated with cover crops in corn and soybean production - (Proceedings)
N loss to drain flow and N2O emissions from a corn-soybean rotation with winter rye Reprint Icon - (Peer Reviewed Journal)
Gillette, K.L., Malone, R.W., Kaspar, T.C., Ma, L., Parkin, T.B., Jaynes, D.B., Fang, Q.X., Hatfield, J.L., Feyereisen, G.W., Kersebaum, K.C. 2018. N loss to drain flow and N2O emissions from a corn-soybean rotation with winter rye. Science of the Total Environment. 618:982-997. https://doi.org/10.1016/j.scitotenv.2017.09.054.
Fungicide seed treatments for evaluating the corn seedling disease complex following a winter rye cover crop - (Abstract Only)
Acharya, J., Kaspar, T.C., Robertson, A.E. 2017. Fungicide seed treatments for evaluating the corn seedling disease complex following a winter rye cover crop. In: Proceedings of American Phytopathological Society North Central Division Meeting, June 14-16, 2017, Champaign, Illinois.
Effects of cover crop presence, cover crop species selection, and fungicide seed treatment on corn seedling growth Reprint Icon - (Peer Reviewed Journal)
Schenck, L.A., Bakker, M.G., Moorman, T.B., Kaspar, T.C. 2017. Effects of cover crop presence, cover crop species selection, and fungicide seed treatment on corn seedling growth. Renewable Agriculture and Food Systems. https://doi.org/10.1017/S1742170517000345.
Long-term research and monitoring of conservation practice effects in Iowa watersheds - (Abstract Only)
Moorman, T.B., Tomer, M.D., Jaynes, D.B., Kaspar, T.C., Parkin, T.B., Malone, R.W., Isenhart, T.M. 2017. Long-term research and monitoring of conservation practice effects in Iowa watersheds. In: proceedings of UCOWR/NIWR Annual Conference, June 13-15, 2017, Fort Collins, Colorado. Available: http://ucowr.org/files/2017_Conference/proceedings/2017.pdf.
Winter rye as a cover crop reduces nitrate loss to subsurface drainage as simulated by HERMES - (Peer Reviewed Journal)
Malone, R.W., Kersebaum, K.C., Kaspar, T.C., Ma, L., Jaynes, D.B., Gillette, K.L. 2017. Winter rye as a cover crop reduces nitrate loss to subsurface drainage as simulated by HERMES. Agricultural Water Management. 184:156-169. doi: 10.1016/j.agwat.2017.01.016.
Time interval between cover crop termination and planting influences corn seedling disease, plant growth, and yield Reprint Icon - (Peer Reviewed Journal)
Acharya, J., Bakker, M.G., Moorman, T.B., Kaspar, T.C., Lenssen, A.W., Robertson, A.E. 2016. Time interval between cover crop termination and planting influences corn seedling disease, plant growth, and yield. Plant Disease. 101(4):591-600. https://doi.org/10.1094/PDIS-07-16-0975-RE.
Impact of broadcasting a cereal rye or oat cover crop before corn and soybean harvest on nitrate leaching - (Abstract Only)
Kaspar, T.C., Jaynes, D.B., Parkin, T.B., Moorman, T.B. 2016. Impact of broadcasting a cereal rye or oat cover crop before corn and soybean harvest on nitrate. In: Proceedings of ASA-CSSA-SSSA Annual Meeting, November 6-9, 2016, Phoenix, Arizona. Available: https://scisco.confex.com/scisoc/2016am/webprogram/Paper99705.html.
Isolation of cultivation-resistant oomycetes, first detected as amplicon sequences, from roots of herbicide-terminated winter rye - (Peer Reviewed Journal)
Bakker, M.G., Moorman, T.B., Kaspar, T.C., Manter, D.K. 2017. Isolation of cultivation-resistant oomycetes, first detected as amplicon sequences, from roots of herbicide-terminated winter rye. Phytobiomes Journal. 1(1):24-35. doi: 10.1094/PBIOMES-10-16-0011-R.
Rye cover crop effects on direct and indirect nitrous oxide emissions Reprint Icon - (Peer Reviewed Journal)
Parkin, T.B., Kaspar, T.C., Jaynes, D.B., Moorman, T.B. 2016. Rye cover crop effects on direct and indirect nitrous oxide emissions. Soil Science Society of America Journal. 80(6):1551-1559. doi: 10.2136/sssaj2016.04.0120.
Study of the influence of winter rye on soybean seedling and root rot diseases - (Abstract Only)
Araldi Da Silva, G., Kaspar, T.C., Helmers, M., Mueller, D., Leandro, L. 2016. Study of the influence of winter rye on soybean seedling and root rot diseases. In: Proceedings of American Pathological Society North Central Division Annual Meeting, June 7-9, 2016, Roseville, MN.
Soil water improvements with the long-term use of a winter rye cover crop Reprint Icon - (Peer Reviewed Journal)
Basche, A.D., Kaspar, T.C., Archontoulis, S., Jaynes, D.B., Sauer, T.J., Parkin, T.B., Miguez, F. 2016. Soil water improvements with the long-term use of a winter rye cover crop. Agricultural Water Management. 172:40-50. doi: 10.1016/j.agwat.2016.04.006.
The potential for cereal rye cover crops to host corn seedling pathogens - (Peer Reviewed Journal)
Bakker, M.G., Acharya, J., Moorman, T.B., Robertson, A., Kaspar, T.C. 2016. The potential for cereal rye cover crops to host corn seedling pathogens. Phytopathology. 106:591-601.
Time interval between cover crop termination and planting influences corn seedling disease, plant growth, and yield Reprint Icon - (Peer Reviewed Journal)
Acharya, J., Bakker, M.G., Moorman, T.B., Kaspar, T.C., Lenssen, A.W., Robertson, A.E. 2017. Time interval between cover crop termination and planting influences corn seedling disease, plant growth, and yield. Plant Disease. 101(4):591-600. doi: 10.1094/PDIS-07-16-0975-RE.
Simulating woodchip bioreactor performance using a dual-porosity model - (Peer Reviewed Journal)
Jaynes, D.B., Moorman, T.B., Parkin, T.B., Kaspar, T.C. 2016. Simulating woodchip bioreactor performance using a dual-porosity model. Journal of Environmental Quality. 45(3):830-838. doi: 10.2134/jeq2015.07.0342.
Effect of length of interval between cereal rye cover crop termination and corn planting on seedling root disease and corn growth - (Abstract Only)
Kaspar, T.C., Acharya, J., Robertson, A., Bakker, M.G., Lenssen, A., Moorman, T.B. 2015. Effect of length of interval between cereal rye cover crop termination and corn planting on seedling root disease and corn growth. In: Proceedings of ASA-CSSA-SSSA Annual Meeting, November 15-18, 2015, Minneapolis, Minnesota. Poster No. 502. Available: https://scisoc.confex.com/scisoc/2015am/webprogram/Paper92188.html.
Cover crop options and mixes for the upper midwest - (Abstract Only)
Appelgate, S.R., Lenssen, A.W., Wiedenhoeft, M.H., Kaspar, T.C. 2015. Cover crop options and mixes for the upper midwest. In: Proceedings of ASA-CSSA-SSSA Annual Meeting, November 2-5, 2014, Long Beach, California. Available: https://scisoc.confex.com/scisoc/2014am/webprogram/Paper92543.html.
Simulating long-term impacts of cover crops and climate change on crop production and environmental outcomes in the midwestern United States - (Peer Reviewed Journal)
Basche, A.D., Archontoulis, S., Kaspar, T.C., Jaynes, D.B., Parkin, T.B., Miguez, F. 2016. Simulating long-term impacts of cover crops and climate change on crop production and environmental outcomes in the midwestern United States. Agriculture, Ecosystems and Environment. 218:95-106. doi: 10.1016/j.agee.2015.11.011.
Seeding date affects fall growth of winter canola (Brassica napus L. ‘Baldur’) and its performance as a winter cover crop in central Iowa - (Peer Reviewed Journal)
Martinez-Feria, R., Kaspar, T.C., Wiedenhoeft, M.H. 2016. Seeding date affects fall growth of winter canola (Brassica napus L. ‘Baldur’) and its performance as a winter cover crop in central Iowa. Crop, Forage & Turfgrass Management. 2(1). doi: 10.2134/cftm2015.0181.
Cover crops in vegetable production systems ()
Nair, A., Kaspar, T.C. 2015. Cover crops in vegetable production systems. Extension Publications. HORT 3026. Iowa State University Extension and Outreach.
Winter rye cover crops as a host for corn seedling pathogens - (Abstract Only)
Bakker, M.G., Moorman, T.B., Kaspar, T.C., Manter, D.K. 2016. Winter rye cover crops as a host for corn seedling pathogens. American Phytopathological Society. 106:S1.2. doi: 10.1094/PHYTO-106-1-s1.1
Effect of date of termination of a winter cereal rye cover crop (Secale cereale) on corn seedling disease - (Abstract Only)
Acharya, J., Bakker, M.G., Kaspar, T.C., Moorman, T.B., Lenssen, A., Robertson, A. 2016. Effect of date of termination of a winter cereal rye cover crop (Secale cereale) on corn seedling disease. American Phytopathological Society Annual Meeting. 106:S1.1.
Soil water improvements with the long-term use of a winter rye cover crop - (Abstract Only)
Basche, A.D., Kaspar, T.C., Archontoulis, S., Jaynes, D.B., Parkin, T.B., Sauer, T.J., Miguez, F. 2015. Soil water improvements with the long-term use of a winter rye cover crop. In: Proceedings of American Geophysical Union 2015 Fall Meeting, December 14-18, 2016, San Francisco, CA.
Biomass production of 12 winter cereal cover crop cultivars and their effect on subsequent no-till corn yield - (Peer Reviewed Journal)
Kaspar, T.C., Bakker, M.G. 2015. Biomass production of 12 winter cereal cover crop cultivars and their effect on subsequent no-till corn yield. Journal of Soil and Water Conservation. 70(6):142A-154A. doi: 10.2489/jswc.70.6.142A.
Winter rye cover crop effect on corn seedling pathogens - (Abstract Only)
Schenck, L., Kaspar, T.C., Moorman, T.B., Bakker, M.G., Loynachan, T.E. 2014. Winter rye cover crop effect on corn seedling pathogens. In: Proceedings of ASA-CSSA-SSSA Annual Meeting, November 2-11, 2014, Long Beach, California. 388-12:500. Available: https://scisoc.confex.com/scisoc/2014am/webprogram/Paper86203.html.
Evaluation of a model framework to estimate soil and soil organic carbon redistribution by water and tillage using 137Cs in two U.S Midwest agricultural fields Reprint Icon - (Peer Reviewed Journal)
Young, C.J., Liu, S., Schumacher, J.A., Schumacher, T.E., Kaspar, T.C., McCarty, G.W., Napton, D., Jaynes, D.B. 2014. Evaluation of a model framework to estimate soil and soil organic carbon redistribution by water and tillage using 137Cs in two U.S Midwest agricultural fields. Geoderma. 232:437-448. Available at: http://www.sciencedirect.com/science/journal/00167061/232.
Rye cover crop effects on soil quality in no-till corn silage-soybean cropping systems Reprint Icon - (Peer Reviewed Journal)
Moore, E.B., Kaspar, T.C., Wiedenhoeft, M.H., Cambardella, C.A. 2014. Rye cover crop effects on soil quality in no-till corn silage-soybean cropping systems. Soil Science Society of America Journal. 78(3):968-976. DOI: 10.2136/sssaj2013.09.0401.
Cover crops in the upper midwestern United States: Potential adoption and reduction of nitrate leaching in the Mississippi River Basin - (Peer Reviewed Journal)
Kladivko, E.J., Kaspar, T.C., Jaynes, D.B., Malone, R.W., Singer, J., Morin, X.K., Searchinger, T. 2014. Cover crops in the upper midwestern United States: Potential adoption and reduction of nitrate leaching in the Mississippi River Basin. Journal of Soil and Water Conservation. 69(4):279-291. DOI: 10.2489/jswc.69.4.279.
Modeling the long-term effect of winter cover crops on nitrate transport in artificially drained fields across the Midwest U.S. - (Abstract Only)
Cover crops in the upper midwestern United States: Simulated effect on nitrate leaching with artificial drainage - (Peer Reviewed Journal)
Malone, R.W., Jaynes, D.B., Kaspar, T.C., Thorp, K.R., Kladivko, E.J., Ma, L., James, D.E., Singer, J.W., Morin, X.K., Searchinger, T.D. 2014. Cover crops in the upper midwestern United States: Simulated effect on nitrate leaching with artificial drainage. Journal of Soil and Water Conservation. 69:292-305.
Do cover crops increase or decrease nitrous oxide emissions? A meta-analysis - (Peer Reviewed Journal)
Basche, A.D., Miguez, F.E., Kaspar, T.C., Castellano, M.J. 2014. Do cover crops increase or decrease nitrous oxide emissions? A meta-analysis. Journal of Soil and Water Conservation. 69:471-482.
Nitrous oxide emissions from intensively managed agroecosystems: The role of carbon inputs - (Abstract Only)
Castellano, M.J., Basche, A., Iqball, J., Kaspar, T.C., Miguez, F., Mitchell, D.C., Parkin, T.B. 2013. Nitrous oxide emissions from intensively managed agroecosystems: The role of carbon inputs. American Geophysical Union Meeting Abstract Database. Available at: http://abstractsearch.agu.org/meetings/2013/FM/sections/B/sessions/B14C/abstracts/B14C-01.html.
Rye cover crop effects on nitrous oxide emissions from a corn-soybean system - (Abstract Only)
Parkin, T.B., Kaspar, T.C., Jaynes, D.B., Moorman, T.B. 2013. Rye cover crop effects on nitrous oxide emissions from a corn-soybean system [abstract]. ASA-CSSA-SSSA Annual Meeting Abstracts, November 3-6, 2013, Tampa, FL.
Winter cover crop effect on corn seedling pathogens - (Abstract Only)
Schenck, L., Kaspar, T.C., Moorman, T.B., Bakker, M.G. 2013. Winter cover crop effect on corn seedling pathogens. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 3-6, 2013, Tampa, FL. Available: https://scisoc.confex.com/crops/2013am/webprogram/start.html.
Rye cover crop effects on soil properties in no-till corn silage/soybean agroecosystems - (Abstract Only)
Moore, E., Kaspar, T.C., Wiedenhoeft, M., Cambardella, C.A. 2012. Rye cover crop effects on soil properties in no-till corn silage/soybean agroecosystems. American Society of Agronomy Annual Meetings [abstracts]. ASA-CSSA-SSSA Annual Meeting. Oct. 21-24, 2012, Cincinnati, OH. Available: https://www.acsmeetings.org/meetings.
Dealing with drought: Securing nitrogen with cover crops ()
Kaspar, T.C., Meisinger, J.J., Robison, D. 2012. Dealing with drought: Securing nitrogen with cover crops. World Wide Web. Available: http://www.croplife.com/webinars.
Effectiveness of oat and rye cover crops in reducing nitrate losses in drainage water - (Peer Reviewed Journal)
Kaspar, T.C., Jaynes, D.B., Parkin, T.B., Moorman, T.B., Singer, J.W. 2012. Effectiveness of oat and rye cover crops in reducing nitrate losses in drainage water. Agricultural Water Management. 110:25-33. DOI:10.1016/j.agwat.2012.03.010.
Midwest Cover Crops Field Guide ()
Fisher, B., Gerber, C., Johnson, K., Kladivko, E., Nice, G., Robison, D., Kaspar, T.C., Ackroyd, V.J., Baas, D.G., Bird, G.W., Brainard, D.C., Goldy, R.G., Harrigan, T.M., Hausbeck, M.K., Mutch, D.R., Ngouajio, M., Renner, K., Sprague, C., Taylor, E., Hoorman, J.J., Islam, R., Petrosino, J., Reeder, R., Sundermeier, A., Young, C., Brown, C., Callow, K., Celetti, M., Robinson, D., Tenuta, A., Van Eerd, L., Verhallen, A., Albrecht, K. 2012. Midwest Cover Crops Field Guide. p. 136. Available: http://www3.ag.purdue.edu/agry/dtc/Pages/CoverCropsFG.aspx.
Effectiveness of oat and rye cover crops in reducing nitrate losses in drainage water - (Abstract Only)
Kaspar, T.C., Jaynes, D.B., Parkin, T.B., Moorman, T.B., Singer, J.W. 2011. Effectiveness of oat and rye cover crops in reducing nitrate losses in drainage water. American Society of Agronomy Annual Meetings [abstracts]. ASA-CSSA-SSSA Annual Meeting. Oct. 16-19, 2011, San Antonio, TX. CD-ROM.
Rye cover crop effects on soil properties in no-till corn silage/soybean agroecosystems - (Abstract Only)
Moore, E., Kaspar, T.C., Wiedenhoeft, M. 2011. Rye cover crop effects on soil properties in no-till corn silage/soybean agroecosystems. American Society of Agronomy Annual Meetings [abstracts]. ASA-CSSA-SSSA Annual Meeting. Oct. 16-19, 2011, San Antonio, TX. CD-ROM.
Quantities and qualities of physical and chemical fractions of soil organic matter under a rye cover crop - (Abstract Only)
Olk, D.C., Cambardella, C.A., Kaspar, T.C. 2011. Quantities and qualities of physical and chemical fractions of soil organic matter under a rye cover crop. American Society of Agronomy Annual Meetings [abstracts]. ASA-CSSA-SSSA Annual Meeting. Oct. 16-19, 2011, San Antonio, TX. CD-ROM.
Soil CO2 flux in response to wheel traffic in a no-till system - (Peer Reviewed Journal)
Kaspar, T.C., Parkin, T.B. 2011. Soil CO2 flux in response to wheel traffic in a no-till system. Soil Science Society of America Journal. 75:2296-2304.
Economically optimal N rates of corn management zones delineated from soil and terrain attributes - (Peer Reviewed Journal)
Jaynes, D.B., Kaspar, T.C., Colvin, T. 2011. Economically optimal N rates of corn management zones delineated from soil and terrain attributes. Agronomy Journal. 103:1026-1035.
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.
The use of cover crops to manage soil ()
Kaspar, T.C., Singer, J.W. 2011. The use of cover crops to manage soil. In: Hatfield, J.L., Sauer, T.J., editors. Soil Management: Building a stable base for agriculture. Madison, WI: American Society of Agronomy and Soil Science Society of America. p. 321-337.
Seasonal Shifts in the Biochemical Compoments of the Light Fraction, Particulate Organic Matter, and Two Humic Acid Fractions in An Iowa Soil - (Abstract Only)
Olk, D.C., Cambardella, C.A., Kaspar, T.C. 2010. Seasonal Shifts in the Biochemical Compoments of the Light Fraction, Particulate Organic Matter, and Two Humic Acid Fractions in An Iowa Soil. American Society of Agronomy Annual Meetings [abstracts]. ASA-CSSA-SSSA Annual Meeting. Oct. 31 - Nov. 4, 2010, Long Beach, CA. CD-ROM.
Using cover crops and cropping systems for nitrogen management ()
Dabney, S.M., Meisinger, J.J., Schomberg, H.H., Liebig, M.A., Kaspar, T.C., Delgado, J.A., Mitchell, J., Reeves, D.W. 2010. Using cover crops and cropping systems for nitrogen management. p. 230-281. In Delgado, J.A. and R.F. Follett (eds) Advances in Nitrogen Management for Water Quality, Ankeny, IA.
Denitrification Activity, Wood Loss, and N2O Emissions Over 9 Years From a Wood Chip Bioreactor - (Peer Reviewed Journal)
Moorman, T.B., Parkin, T.B., Kaspar, T.C., Jaynes, D.B. 2010. Denitrification Activity, Wood Loss, and N2O Emissions Over 9 Years From a Wood Chip Bioreactor. Ecological Engineering. 36:1567-1574.
Root characteristics of two soybean cultivars grown in fumigated fields in Iowa - (Peer Reviewed Journal)
Murillo-Williams, A., Kaspar, T.C., Pedersen, P. 2010. Root characteristics of two soybean cultivars grown in fumigated fields in Iowa. Crop Science. 50:2037-2045.
Cover Crops - (Proceedings)
Kaspar, T.C. 2009. Cover Crops. In: Indiana Certified Crop Advisor Conference, December 15-16, 2009, Indianapolis, IN. 2009 CD-ROM.
Cover Crop Biomass and Corn Yield Following 13 Rye, Wheat, and Triticale Cultivars Used as Winter Cover Crops - (Abstract Only)
Kaspar, T.C. 2009. Cover Crop Biomass and Corn Yield Following 13 Rye, Wheat, and Triticale Cultivars Used as Winter Cover Crops [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 1-5, 2009, Pittsburgh, PA.
Cover Crop Effects on Nitrous Oxide Emission from a Manure-Treated Mollisol - (Peer Reviewed Journal)
Jarecki, M.K., Parkin, T.B., Chan, A.S., Kaspar, T.C., Moorman, T.B., Singer, J.W., Kerr, B.J., Hatfield, J.L., Jones, R. 2009. Cover Crop Effects on Nitrous Oxide Emission from a Manure-Treated Mollisol. Agriculture, Ecosystems and Environment. 134(1-2):29-35.
Denitrification in Wood Chip Bioreactors at Different Water Flows - (Peer Reviewed Journal)
Greenan, C., Moorman, T.B., Parkin, T.B., Kaspar, T.C., Jaynes, D.B. 2009. Denitrification in Wood Chip Bioreactors at Different Water Flows. Journal of Environmental Quality. 38:1664-1671.
A Centralized Regional Database for Winter Cover Crops in Annual Cropping Systems - (Abstract Only)
Kaspar, T.C., Kladivko, E., Wyse, D.L., Verhallen, E.A., Sundermeier, A., Mutch, D.R., Baas, D.G. 2008. A Centralized Regional Database for Winter Cover Crops in Annual Cropping Systems [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Oct. 5-9, 2008, Houston, TX.
Winter Cover Crop Effects on Nitrate Leaching in Subsurface Drainage as Simulated by RZWQM-DSSAT - (Peer Reviewed Journal)
Li, L., Malone, R.W., Ma, L., Kaspar, T.C., Jaynes, D.B., Saseendran, S.A., Thorp, K.R., Yu, Q., Ahuja, L.R. 2008. Winter Cover Crop Effects on Nitrate Leaching in Subsurface Drainage as Simulated by RZWQM-DSSAT. Transactions of the ASABE. 51:1575-1583.
Studies of spatial patterns of soil redistribution in two small agricultural fields - (Abstract Only)
Ritchie, J.C., McCarty, G.W., Kaspar, T.C., Venteris, E.R. 2009. Studies of spatial patterns of soil redistribution in two small agricultural fields [abstract]. Agronomy Society of America. 60-1.
Small Grain Winter Cover Crops for Corn and Soybean ()
Kaspar, T.C., Singer, J.W. 2008. Small Grain Winter Cover Crops for Corn and Soybean. Electronic Publication. Available: http://www.cai.iastate.edu/modules/module.aspx?modID=91.
Rye Cover Crops in a Corn Silage-Soybean Rotation - (Abstract Only)
Kaspar, T.C., Singer, J.W. 2007. Rye Cover Crops in a Corn Silage-Soybean Rotation [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 4-8, 2007, New Orleans, LA.
POTENTIAL AND LIMITATIONS OF COVER CROPS, LIVING MULCHES, AND PERENNIALS TO REDUCE NUTRIENT LOSSES TO WATER SOURCES FROM AGRICULTURAL FIELDS IN THE UPPER MISSISSIPPI BASIN - (Proceedings)
Kaspar, T.C., Kladivko, E.J., Singer, J.W., Morse, S., Mutch, D. 2008. Potential and limitations of cover crops, living mulches, and perennials to reduce nutrient losses to water sources from agricultural fields in the upper Mississippi basin. In: Final Report: Gulf Hypoxia and Local Water Quality Concerns Workshop. St. Joseph, Michigan, ASABE. p.129-148.
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.
Managing Cover Crops in Conservation Tillage Systems ()
Balkcom, K.S., Schomberg, H.H., Reeves, D.W., Clark, A., Baumhardt, R.L., Collins, H.P., Delgado, J.A., Kaspar, T.C., Mitchell, J., Duiker, S. 2007. Managing Cover Crops in Conservation Tillage Systems. In: Clark, A. Managing Cover Crops Profitability. 3rd edition. Handbook Series Book 9. Sustainable Agriculture Network. p. 44-61.
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.
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.
Soil Respiration in Response to Landscape Position - (Abstract Only)
Desutter, T.M., Parkin, T.B., Kaspar, T.C., Sauer, T.J., Hatfield, J.L. 2006. Soil Respiration in Response to Landscape Position [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 12-16, 2006, Indianapolis, IN.
Field Comparison of Methods for Measuring Soil CO2 Flux - (Abstract Only)
Parkin, T.B., De Sutter, T.M., Prueger, J.H., Kaspar, T.C., Sauer, T.J. 2006. Field Comparison of Methods for Measuring Soil CO2 Flux [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts. Nov. 12-16, 2006, Indianapolis, IN.
Field measurement results versus DAYCENT simulations in nitrous oxide emission from agricultural soil in Central Iowa - (Abstract Only)
Jarecki, M.K., Parkin, T.B., Chan, A., Kaspar, T.C., Hatfield, J.L., Jones, R.A. 2006. Field measurement results versus DAYCENT simulations in nitrous oxide emission from agricultural soil in Central Iowa [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts. Nov. 12-16, 2006, Indianapolis, IN.
Cover Crop Effects on the Fate of Swine Manure-N Applied to Soil - (Abstract Only)
Kaspar, T.C., Parkin, T.B., Singer, J.W. 2006. Cover Crop Effects on the Fate of Swine Manure-N Applied to Soil [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts. Nov. 12-16, 2006, Indianapolis, IN.
In-Field Bioreactor for Removing Nitrate from Tile Drainage - (Abstract Only)
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.
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.
NITROUS OXIDE EMISSIONS FROM CORN/SOYBEAN SYSTEMS IN THE MIDWEST - (Peer Reviewed Journal)
Parkin, T.B., Kaspar, T.C. 2006. Nitrous oxide emissions from corn/soybean systems in the Midwest. Journal of Environmental Quality. 35:1496-1506.
Geomorphic Controls of Soil and Carbon Redistribution Across an Agricultural Landscape - (Abstract Only)
Ritchie, J.C., McCarty, G.W., Venteris, E.R., Kaspar, T.C. 2006. Geomorphic controls of soil and carbon redistribution across an agricultural landscape [abstract]. American Geophysical Union Fall Meeting Abstract No. B51B-309.
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'" ()
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.
COVER CROP EFFECTS ON THE FATE OF SWINE MANURE-N APPLIED TO SOIL - (Peer Reviewed Journal)
Parkin, T.B., Kaspar, T.C., Singer, J.W. 2006. Cover crop effects on the fate of swine manure-N applied to soil. Plant and Soil Journal. 289:141-152.
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.
COVER CROP SELECTION AND MANAGEMENT FOR MIDWEST FARMING SYSTEMS ()
Singer, J.W., Kaspar, T.C. 2006. Cover crop selection and management for midwest farming systems. Iowa Learning Farm Newsletter. Available: http://www.extension.iastate.edu/ilf/.
COVER CROP SELECTION AND MANAGEMENT FOR AGRONOMIC FARMING SYSTEMS - (Proceedings)
Singer, J.W., Kaspar, T.C. 2005. Cover crop selection and management for agronomic farming systems. In: Proceedings of the Integrated Crop Management Conference, Nov. 30-Dec. 1, 2005, Ames, IA. p. 197-198.
EFFECTS OF A RYE COVER CROP AND A PERMANENT GAMAGRASS STRIP ON NITRATE LOAD IN TILE DRAINAGE - (Abstract Only)
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.
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.
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.
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.
SMALL GRAIN COVER CROPS FOR CORN AND SOYBEAN ()
Singer, J.W., Kaspar, T.C., Pedersen, P. 2005. Small grain cover crops for corn and soybean. Fact Sheet:PM 1999. Meeting Abstract. Available: http://www.extension.iastate.edu/pubs/Masterlist4.html#1800
SOIL AND SOIL ORGANIC CARBON REDISTRIBUTION IN AGRICULTURAL ECOSYSTEMS - (Peer Reviewed Journal)
Ritchie, J.C., McCarty, G.W., Venteris, E.R., Kaspar, T.C. 2007. Soil and soil organic carbon redistribution in agricultural ecosystems. Geomorphology. 89(1-2):163-171.
RELATIONSHIP OF SOIL RESPIRATION TO CROP AND LANDSCAPE IN THE WALNUT CREEK WATERSHED - (Peer Reviewed Journal)
Parkin, T.B., Kaspar, T.C., Senwo, Z., Prueger, J.H., Hatfield, J.L. 2005. Relationship of soil respiration to crop and landscape in the Walnut Creek watershed. Journal of Hydrometeorology. 6(6):812-824.
NITROUS OXIDE EMISSIONS FROM MIDWEST CORN/SOYBEAN CROPPING SYSTEMS - (Abstract Only)
Parkin, T.B., Kaspar, T.C. 2005. Nitrous oxide emissions from midwest corn/soybean cropping systems. USDA Greenhouse Gas Symposium. http://soilcarboncenter.k-state.edu/conference/Abstract_Pages.htm.
FILLING DATA GAPS IN SOIL RESPIRATION MEASUREMENTS USING AUTOCORRELATION - (Abstract Only)
Parkin, T.B., Kaspar, T.C. 2005. Filling data gaps in soil respiration measurements using autocorrelation. USDA Greenhouse Gas Symposium. http://soilcarboncenter.k-state.edu/conference/Abstract_Pages.htm
SOIL AND SOIL ORGANIC CARBON REDISTRIBUTION IN AGRICULTURAL ECOSYSTEMS - (Abstract Only)
Ritchie, J., McCarty, G., Venteris, E., Kasper, T. 2005. Soil and soil organic carbon redistribution in agricultural ecosystems [abstract]. European Geophysical Research Abstracts. 7:00571.
USING SOIL REDISTRIBUTION TO UNDERSTAND SOIL ORGANIC CARBON REDISTRIBUTION AND BUDGETS - (Peer Reviewed Journal)
Ritchie, J.C., McCarty, G.W. Venteris, E.R., Kaspar, T.C. 2005. Using sediment budgets to understand soil organic carbon redistribution and budgets. International Association of Hydrological Sciences Publication. 292:3-8.
SOIL CO2 FLUX ON A HILLSLOPE TRANSECT IN RELATION TO TERRAIN VARIABLES, SOIL TEXTURE, SOIL OM, AND RESIDUE INPUTS - (Abstract Only)
Kaspar, T.C., Parkin, T.B. 2004. Soil CO2 Flux on a Hillslope Transect in Relation to Terrain Variables, Soil Texture, Soil OM, and Residue Inputs [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.
ULTRASONIC SENSING FOR CORN PLANT CANOPY CHARACTERIZATION - (Proceedings)
Abd Aziz, S., Stewart, B.L., Birrell, S.J., Kaspar, T.C., Shrestha, D.S. 2004. Ultrasonic sensing for corn plant canopy characterization. ASAE Annual International Meeting. St. Joseph, MI. Paper No. 04-041120.
DEVELOPMENT OF NITROGEN RESPONSE CURVES USING FIELD SCALE DATA AND DATA MINING - (Abstract Only)
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.
ASSESSING SOIL ORGANIC CARBON REDISTRIBUTION WITH FALLOUT CESIUM-137 - (Proceedings)
Ritchie, J.C., McCarty, G.W., Venteris, E.R., Kaspar, T.C., Owens, L.B., Nearing, M. 2004. Assessing soil organic carbon redistribution with fallout 137Cesium. In: Proceedings of Conserving Soil and Waterfor Society: Sharing Solutions, ISCO 2004-13th International Soil Conservation Organization Conference, July 4-9, 2004, Brisbane, Australia. 613:4. 2004 CDROM.
BEYOND FERTILIZER MANAGEMENT: IN-FIELD APPROACHES FOR REDUCING NITRATE LOADS COMING FROM AGRICULTURAL DRAINAGE TILES - (Abstract Only)
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.
POTENTIAL METHODS FOR REDUCING NITRATE LOSSES IN ARTIFICIALLY DRAINED FIELDS - (Proceedings)
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.
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.
ASSESSING SOIL AND SOIL CARBON REDISTRIBUTION PATTERNS USING RADIOACTIVE FALLOUT 137 CESIUM - (Abstract Only)
Ritchie, J.C., McCarty, G.W., Venteris, E.R., Owens, L.B., Kaspar, T.C., Nearing, M.A. 2003. Assessing soil and soil carbon redistribution patterns using radioactive fallout 137 Cesium [abstract]. Abstracts of 2003 Global Climate Terrestrial Ecology Meeting in Tucson, Arizona. p. 28.
TEMPORAL VARIABILITY OF SOIL C02 FLUX: EFFECT OF SAMPLING FREQUENCY ON CUMULATIVE CARBON LOSS ESTIMATION - (Peer Reviewed Journal)
Parkin, T.B., Kaspar, T.C. 2004. Temporal variability of soil C02 flux: effect of sampling frequency on cumulative carbon loss estimation. Soil Science Society of America Journal. 68(4):1234-1241.
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.
CHANGES IN SOIL CARBON RESPONSE TO YEAR, PREVIOUS CROP, AND COVER CROP - (Abstract Only)
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.
STIMULATION OF DENITRIFICATION AND NITRATE REMOVAL FROM SUBSURFACE DRAINAGE WATER - (Abstract Only)
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.
CORN SOYBEAN YIELD ZONES FROM CLUSTER ANALYSIS OF MULTI-YEAR YIELD DATA - (Abstract Only)
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.
CARBON DIOXIDE DYNAMICS DURING A GROWING SEASON IN MIDWESTERN CROPPING SYSTEMS - (Peer Reviewed Journal)
Prueger, J.H., Hatfield, J.L., Parkin, T.B., Kustas, W.P., Kaspar, T.C. 2003. Carbon Dioxide Dynamics During a Growing Season in Midwestern Cropping Systems. Environmental Management. 33(1):330-343.
TEMPERATURE CONTROLS ON DIURNAL CO2 FLUX: IMPLICATIONS FOR ESTIMATING SOIL C LOSS - (Peer Reviewed Journal)
PARKIN, T.B., KASPAR, T.C. 2003. TEMPERATURE CONTROLS ON DIURNAL CO2 FLUX: IMPLICATIONS FOR ESTIMATING SOIL C LOSS. SOIL SCIENCE SOCIETY OF AMERICA JOURNAL. 67:1763-1772.
DENITRIFICATION-BASED REMOVAL OF NITRATE FROM SUBSURFACE DRAINAGE WATER - (Abstract Only)
IMPACT OF SAMPLING FREQUENCY ON SOIL CO2 FLUX ESTIMATION - (Abstract Only)
PARKIN, T.B., KASPAR, T.C. IMPACT OF SAMPLING FREQUENCY ON SOIL CO2 FLUX ESTIMATION. ASA-CSSA-SSSA ANNUAL MEETING ABSTRACTS. 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.
SUBSURFACE DRAINAGE MODIFICATIONS TO REDUCE NITRATE LOSSES IN DRAINAGE - (Proceedings)
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.
PLANT HEIGHT ESTIMATION USING TWO SENSING SYSTEMS - (Proceedings)
SHRESTHA, D.S., STEWARD, B.L., BIRRELL, S.J., KASPAR, T.C. PLANT HEIGHT ESTIMATION USING TWO SENSING SYSTEMS. ASAE ANNUAL INTERNATIONAL MEETING. 2002. CD-ROM. ST. JOSEPH, MI.
COMPARISON OF TECHNIQUES FOR DEFINING YIELD POTENTIAL ZONES IN AN IOWA FIELD - (Proceedings)
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.
DETERMINATION OF EARLY STAGE CORN PLANT HEIGHT USING STEREO VISION - (Proceedings)
SHRESTHA, D.S., STEWARD, B.L., KASPAR, T.C. DETERMINATION OF EARLY STAGE CORN PLANT HEIGHT USING STEREO VISION. INTERNATIONAL CONFERENCE ON PRECISION AGRICULTURE ABSTRACTS & PROCEEDINGS. 2002. CD-ROM. MADISON, WI.
OAT PLANT EFFECTS ON NET NITROGEN MINERALIZATION - (Peer Reviewed Journal)
PARKIN, T.B., KASPAR, T.C., CAMBARDELLA, C.A. OAT PLANT EFFECTS ON NET NITROGEN MINERALIZATION. PLANT AND SOIL JOURNAL. 2002. V. 243. P. 187-195.
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.
NITRATE LEACHING AS INFLUENCED BY COVER CROPS IN LARGE SOIL MONOLITHS - (Peer Reviewed Journal)
LOGSDON, S.D., KASPAR, T.C., MEEK, D.W., PRUEGER, J.H. NITRATE LEACHING AS INFLUENCED BY COVER CROPS IN LARGE SOIL MONOLITHS. AGRONOMY JOURNAL. 2002. V. 94(4). P. 807-814.
CLUSTER ANALYSIS OF SPATIOTEMPORAL CORN YIELD PATTERNS IN AN IOWA FIELD - (Peer Reviewed Journal)
JAYNES,D.B., KASPAR,T.C., COLVIN,T.S., JAMES,D.E., CLUSTER ANALYSIS OF SPATIOTEMPORAL CORN YIELD PATTERNS IN AN IOWA FIELD, AGRONOMY JOURNAL, 2003. v. 95. p. 574-586.
SMALL GRAIN COVER CROPS FOR IOWA - (Proceedings)
KASPAR, T.C., PARKIN, T.B., KOHLER, K.A. SMALL GRAIN COVER CROPS FOR IOWA. INTEGRATED CROP MANAGEMENT CONFERENCE PROCEEDINGS. 2001. P. 85-89.
TEMPORAL VARIABILITY OF SOIL RESPIRATION - (Abstract Only)
PARKIN, T.B., KASPAR, T.C. TEMPORAL VARIABILITY OF SOIL RESPIRATION. ASA-CSSA-SSSA ANNUAL MEETING ABSTRACTS. 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.
NITROGEN MANAGEMENT STRATEGIES TO REDUCE NITRATE LEACHING IN TILE-DRAINED MIDWESTERN SOILS ()
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.
CROP ROOT RESPONSE TO SOIL TEMPERATURE IN TEMPERATE REGIONS ()
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.
NITRATE LEACHING AS INFLUENCED BY COVER CROPS IN LARGE SOIL MONOLITHS - (Abstract Only)
Logsdon, S.D., Kaspar, T.C., Prueger, J.H., Meek, D.W., Simmons, G.T., Hart, T.T. 2000. Nitrate leaching as influenced by cover crops in large soil monoliths. Soil Science Society of America Annual Meeting. CD-ROM. Madison, Wisconsin.
EFFECT OF COARSE TEXTURED MATERIALS, "A" HORIZON DEPTH, CARBONATE DEPTH, PH, AND SOIL TEXTURE ON CORN YIELD VARIABILITY - (Abstract Only)
USING THE WEIGHT-LOSS-ON-IGNITION METHOD TO MEASURE SPATIAL VARIABILITY OF SOIL CARBON - (Abstract Only)
SMALL GRAIN COVER CROPS AND WHEEL TRAFFIC EFFECTS ON INFILTRATION, RUNOFF, AND EROSION - (Peer Reviewed Journal)
ESTIMATING CORN YIELD USING SIX YEARS OF YIELD DATA AND TERRAIN ATTRIBUTES - (Proceedings)
YIELD CERTAINTY WITH PLOTS OR FIELDS - (Abstract Only)
Colvin, T.S., Jaynes, D.B., Kaspar, T.C., James, D.E., Meek, D.W. 2000. Yield certainty with plots or fields [CD-ROM]. International Conference on Precision Agriculture Abstracts & Proceedings. St. Paul, Minnesota.
DECOMPOSITION OF BURIED ROOT RESIDUES IN THE FIELD - (Abstract Only)
OAT AND RYE ROOT DECOMPOSITION EFFECTS ON NITROGEN MINERALIZATION - (Peer Reviewed Journal)
APPLICATION PLACEMENT TECHNIQUES TO INCREASE NITROGEN USE EFFICIENCY AND REDUCE NITRATE LEACHING - (Abstract Only)
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.
NEW NITROGEN APPLICATION/PLACEMENT TECHNIQUES TO INCREASE USE-EFFICIENCY AND REDUCE NITRATE LEACHING - (Proceedings)
OAT AND RYE ROOT DECOMPOSITION EFFECTS ON CARBON AND NITROGEN CYCLING IN A CONTROLLED ENVIRONMENT - (Abstract Only)
COVER CROP AND WHEEL TRACK EFFECTS ON INFILTRATION, RUNOFF, AND EROSION - (Abstract Only)
PLANT EFFECTS ON NITROGEN MINERALIZATION - (Abstract Only)
ANALYSIS OF WATER STRESS EFFECTS CAUSING SPATIAL YIELD VARIABILITY IN SOYBEANS - (Peer Reviewed Journal)
MODEL-BASED TECHNIQUE TO DETERMINE VARIABLE RATE NITROGEN FOR CORN - (Abstract Only)
OAT AND RYE OVERSEEDED INTO SOYBEAN AS FALL COVER CROPS IN THE UPPER MIDWEST - (Peer Reviewed Journal)
DEPTH INCREMENTAL SOIL PROPERTIES UNDER NO-TILL OR CHISEL MANAGEMENT - (Peer Reviewed Journal)
LOCALIZED SOIL MANAGEMENT IN FERTILIZER INJECTION ZONE TO REDUCE NITRATE LEACHING - (Peer Reviewed Journal)
EVALUATION OF LOCALIZED COMPACTION AND DOMING TO REDUCE ANION LEACHING LOSSES USING LYSIMETERS - (Peer Reviewed Journal)
IMPROVING STAND ESTABLISHMENT IN NO TILL WITH RESIDUE-CLEARING PLANTER ATTACHMENTS - (Peer Reviewed Journal)
INFLUENCE OF CORN ROOTS ON WATER AND CHEMICAL MOVEMENT THROUGH UNDISTURBED SOIL COLUMNS - (Abstract Only)
CORN YIELD RESPONSE TO FERTILIZER FROM AN APPLICATOR DESIGNED TO REDUCE NITRATE LEACHING - (Abstract Only)
IMPROVED FERTILIZER APPLICATOR TO REDUCE NITRATE FERTILIZER LEACHING FROM CROP LANDS - (Proceedings)
CALIBRATION OF A CROP GROWTH MODEL TO PREDICT SPATIAL YIELD VARIABILITY - (Abstract Only)
OATS OVERSEEDED INTO SOYBEANS AS A FALL COVER CROP - (Abstract Only)
ECONOMIC EVALUATION OF CROP MANAGEMENT SYSTEMS FOR SUSTAINABLE AGRICULTURE - (Abstract Only)
ROOTEDGE: SOFTWARE FOR MEASURING ROOT LENGTH FROM DESKTOP SCANNER IMAGES - (Peer Reviewed Journal)
OATS OVERSEEDED INTO SOYBEAN AS A FALL COVER CROP - (Abstract Only)
TESTING A NITROGEN FERTILIZER APPLICATOR DESIGNED TO REDUCE LEACHING LOSSES - (Peer Reviewed Journal)
OATS OVERSEEDED INTO SOYBEAN AS A FALL COVER CROP - (Abstract Only)
CORN PLANTER ATTACHMENT EFFECTS ON SOIL AND RESIDUE - (Proceedings)
USING SMALL GRAIN COVER CROPS TO MANAGE NITROGEN IN THE MIDWEST - (Abstract Only)
TILLAGE AND WHEEL TRAFFIC EFFECTS ON CORN GROWTH AND YIELD - (Abstract Only)
IMPROVED FERTILIZER BANDING TECHNIQUE TO REDUCE NITRATE-N LEACHING: LYSIMETER EVALUATION - (Abstract Only)
OATS OVERSEEDED INTO SOYBEANS AS A FALL COVER CROP - (Abstract Only)
CONVERSION TO NO-TILL INFLUENCE ON INCREMENTAL SOIL PROPERTIES - (Abstract Only)
MAIZE NODAL ROOT RESPONSE TO TIME OF SOIL RIDGING - (Peer Reviewed Journal)
APPLICATIONS TO ROOT RESEARCH METHODOLOGIES BY MEMBERS OF THE CSREES REGIONAL COMMITTEE NCR-60 - (Abstract Only)
SMEARED SOIL SURFACE EVALUATION BY FIBER OPTIC SENSOR AND ROOT PENETRATION - (Proceedings)
SOIL PROPERTY CONTRIBUTIONS TO YIELD VARIATION PATTERNS - (Abstract Only)
SOIL PROPERTY CONTRIBUTIONS TO YIELD VARIATION PATTERNS - (Proceedings)
TILLAGE AND WHEEL TRAFFIC EFFECTS ON CORN YIELD AND ROOT GROWTH ()
SEED-ROW RESIDUE MANAGEMENT FOR CORN PRODUCTION IN THE NORTHERN U.S. CORN BELT ()
RUNOFF, EROSION, AND SOIL QUALITY CHARACTERISTICS OF A FORMER CRP SITE IN SOUTHWESTERN IOWA - (Peer Reviewed Journal)
RESIDUE AND COMPACTION MANAGEMENT IN NO-TILL ()
SOLUTE LEACHING AND CROP WATER BALANCE IN LARGE UNDISTURBED SOIL MONOLITHS - (Abstract Only)
LOCALIZED COMPACTION AND DOMING TO REDUCE NITRATE N LEACHING: EXPERIMENTALAND NUMERICAL - (Abstract Only)
INTERMEDIATE-SCALE SOLUTE LEACHING IN LARGE UNDISTURBED SOIL MONOLITHS - (Proceedings)
SOIL PHYSICAL PROPERTIES IN NO-TILL WITH AND WITHOUT SWEEP CULTIVATION FOR WEED CONTROL - (Abstract Only)
INTERACTIONS OF CROP RESIDUE WITH SOIL AND CLIMATE ()
ACCURATE PERIMETER AND LENGTH MEASUREMENT USING AN EDGE CHORD ALGORITHM - (Peer Reviewed Journal)
TRAFFIC PATTERN AND TILLAGE SYSTEM EFFECTS ON CORN ROOT AND SHOOT GROWTH - (Peer Reviewed Journal)
EFFECTS OF COULTER TREATMENTS ON SEED FURROW SMEARING AND EARLY CROP RESPONSE - (Abstract Only)
EFFECTS OF COULTER TREATMENTS ON SEED-FURROW SMEARING AND EARLY CROP RESPONSE - (Abstract Only)
LOCALIZED COMPACTION AND DOMING TO INCREASE N-USE EFFICIENCY AND REDUCE LEACHING - (Proceedings)