|Technical Articles| |Technical Abstracts|
Sawyer, J., and A.P. Mallarino. 2008. What is meant by crop availability of manure nutrients? In Iowa Manure Manager Series, Vol. 6, Iowa State Univ. Extension, Ames, IA.
Sawyer, J. 2007. Is manure the same as fertilizer as a crop nutrient resource? In Iowa Manure Manager Series, Vol. 5, Iowa State Univ., Ames, IA.
Sawyer, J. 2007. Nitrogen fertilization for continuous and rotated corn. p. 24. In 2007 Proceedings Crop Advantage Series. AEP 0200f. Iowa State Univ., Ames, IA.
Wortman, C., M. Al-Kaisi, M. Helmers, J. Sawyer, D. Devlin, C. Barden, P. Scharf, R. Ferguson, W. Kranz, C. Shapiro, R. Spalding, D. Tarkalson, J. Holz, D. Francis, and J. Schepers. 2006. Agricultural nitrogen management for water quality protection in the Midwest. RP189. Univ. of Nebraska-Lincoln Ext., Lincoln, NE.
Sawyer, J., J. Lundvall, J. Hawkins, and D. Barker. 2006. Sensing nitrogen stress in corn. PM 2026. Iowa State Univ. Ext., Ames, IA.
Sawyer, J., E. Nafziger, G. Randall, L. Bundy, G. Rehm, and B. Joern. 2006. Concepts and Rationale for Regional Nitrogen Rate Guidelines for Corn. PM 2015. Iowa State Univ. Ext., Ames, IA.
Sawyer, J., and A. Mallarino. 2006. Applying fertilizer and lime to CRP land. CRP-5. Iowa State Univ. Ext., Ames, IA.
Mallarino, A.P., B.M. Stewart, J.L. Baker, J.A. Downing, and J.E. Sawyer. 2005. Background and basic concepts of the Iowa phosphorus index. A support document to the USDA-NRCS field office technical note 25. Revised April 2005. USDA-NRCS, Des Moines, IA.
Sawyer, J.E. 2004. Nutrient deficiencies and application injuries in field crops. IPM-42. Revised July 2004. Iowa State University Extension, Ames, IA.
Sawyer, J., A. Mallarino, and R. Killorn. 2003. Take a good sample to help make good decisions. PM 287 Revised September 2003. Iowa State University Extension, Ames, IA.
Mallarino, A., J. Sawyer, and J. Creswell. Revised 2003. Soil testing. NMEP-1 Revised September 2003. Iowa State University Extension, Ames, IA.
Sawyer, J.E., A.P. Mallarino, and R. Killorn. 2003. Interpretation of Soil Test Results. PM 1310. Iowa State University Extension, Ames, IA.
Sawyer, J.E., A.P. Mallarino, R. Killorn, and S.K. Barnhart. 2002. General Guide for Crop Nutrient Recommendations in Iowa. Pm-1688. Iowa State University Extension, Ames, IA.
Mallarino, A. J. Sawyer, and J. Creswell. 2002. Phosphorus application. NMEP-2. Iowa State University Extension, Ames, IA.
Lorimor, J., A. Mallarino, J. Sawyer, and J. Creswell. 2002. Manure resources. NMEP-3. Iowa State University Extension, Ames, IA.
DeWitt, J. M. Duffy, G. Miller, J. Sawyer, and J. Creswell. 2002. Crop rotation. NMEP-5. Iowa State University Extension, Ames, IA.
Sawyer, J. and J. Creswell. 2002. Nitrogen application. NMEP-7. Iowa State University Extension, Ames, IA.
Mallarino, A., J. Sawyer, B. Stewart, and J. Creswell. 2002. Nutrient management plan. NMEP-8. Iowa State University Extension, Ames, IA.
Sawyer, J.E., J. Creswell, R. Pope, and J. Miller. 2001. Nitrogen options, get the most from each pound of nitrogen! IPM 67. Iowa State University Extension.
Mallarino, A.P. and J.E. Sawyer. 2000. Interpreting Mehlich 3 soil test results. SP 126. 3 pp. Iowa State Univ.
Sawyer, J.E., J. Creswell, R. Pope, and J. Miller. 2000. IPM 66A. Don't go until it's 50 or below! Information Poster. Iowa State University Extension.
Laboski, C.A.M., J.E. Sawyer, D.T. Walters, L.G. Bundy, R.G. Hoeft, G.W. Randall, and T.W. Andraski. 2008. Evaluation of the Illinois soil nitrogen test in the north central region of the United States. Agron. J. 100:1070-1076.
Al-Kaisi, M.M., M.L. Kruse, and J.E. Sawyer. 2008. Effect of nitrogen fertilizer application on growing season soil CO2 emission in a corn-soybean rotation. J. Environ. Qual. 37:325-332.
Loria, E.R., J.E. Sawyer, D.W. Barker, J.P. Lundvall, and J.C. Lorimor. 2007. Use of anaerobically digested swine manure as a nitrogen source in corn production. Agron. J. 99:1119-1129.
Hawkins, J.A., J.E. Sawyer, D.W. Barker, and J.P. Lundvall. 2007. Using relative chlorophyll meter values to determine nitrogen application rates for corn. Agron. J. 99:1034-1040.
Barker, D.W., J.E. Sawyer, and M.M. Al-Kaisi. 2006. Assessment of the amino sugar-nitrogen test on Iowa soils: I. Evaluation of soil sampling and corn management practices. Agron. J. 98:1345-1351.
Barker, D.W., J.E. Sawyer, M.M. Al-Kaisi, and J.P. Lundvall. 2006. Assessment of the amino sugar-nitrogen test on Iowa soils: II. Field correlation and calibration. Agron. J. 98:1352-1358.
Loria, E.R., and J.E. Sawyer. 2005. Extractable soil phosphorus and inorganic nitrogen following application of raw and anaerobically digested swine manure. Agron. J. 97:879-885.
Barker, D.W., and J.E. Sawyer. Nitrogen application to soybean at early reproductive development. Agron. J. 97:615-619.
Mallarino, A.P., B.M.Stewart, J.L. Baker, J.D. Downing, and J.E. Sawyer. 2002. Phosphorus indexing for cropland: Overview and basic concepts of the Iowa phosphorus index. J. Soil Water Cons. 57(6):440-447.
Sawyer, J.E., and S.A. Ebelhar. 1995. Sulfur nutrition of winter wheat varieties with till and no-till planting on highly weathered alfisol soils. Comm. Soil Sci. Plant Anal. 26(7&8):1257-1271.
Sawyer, J.E. 1994. Concept of variable rate technology with considerations for fertilizer application. J. Prod. Agric. 7:195-201.
Sawyer, J.E., and J.L. Carter. 1993. Urea-ammonium nitrate solution management techniques for winter wheat production. J. Prod. Agric. 6:62-67.
Schmitt, M.A., J.E. Sawyer, and R.G. Hoeft. 1992. Incubation of injected liquid beef manure: Effect of time and manure rate. Agron. J. 84:224-228.
Bullock, D.G., and J.E. Sawyer. 1991. Nitrogen, potassium, sulfur, and boron fertilization of canola. J. Prod. Agric. 4:550-555.
Sawyer, J.E., M.A. Schmitt, R.G. Hoeft, J.C. Siemens, and D.H. Vanderholm. 1991. Corn production associated with liquid beef manure application methods. J. Prod. Agric. 4:335-344.
Sawyer, J.E., and R.G. Hoeft. 1990. Effect of injected liquid beef manure on soil chemical properties and corn root distribution. J. Prod. Agric. 3:50-55.
Sawyer, J.E., and R.G. Hoeft. 1990. Greenhouse evaluation of simulated injected liquid beef manure. Agron. J. 82:613-618.
Sawyer, J.E., M.A. Schmitt, and R.G. Hoeft. 1990. Inorganic nitrogen distribution and soil chemical transformations associated with injected liquid beef manure. Agron. J. 82:963-969.
Vanden Heuvel, R.M., J.E. Sawyer, M.A. Schmitt, R.G. Hoeft, and G.S. Brinkman. 1989. Corn response to zinc on Illinois soils. J. Fert. Issues. 6(3):68-76.
Hoeft, R.G., J.E. Sawyer, R.M. Vanden Heuvel, M.A. Schmitt, and G.S. Brinkman. 1985. Crop response to sulfur on Illinois soils. J. Fert. Issues 2(3):95-104.
Sawyer, J.E., and G.W. Randall. 2008. Nitrogen rates, p. 59-71. In G. Laing (ed.) Final Report: Gulf Hypoxia and Local Water Quality Concerns Workshop. Upper Mississippi Sub-basin Hypoxia Nutrient Committee, Ames, IA. 26-28 Sep. 2005. ASABE, St. Joseph, MI.
Randall, G.W., and J.E. Sawyer. 2008. Nitrogen application timing, forms and additives. p. 73-85. In G. Laing (ed.) Final Report: Gulf Hypoxia and Local Water Quality Concerns Workshop. Upper Mississippi Sub-basin Hypoxia Nutrient Committee, Ames, IA. 26-28 Sep. 2005. ASABE, St. Joseph, MI.
Sawyer, J.E., J.P. Lundvall, and J.A. Hawkins. 2007. In-season nitrogen management for corn production. p. 231-240. In Proc. Nineteenth Integrated Crop Management Conf., Ames, IA. 28-29 Nov. 2007. Vol. 23. Iowa State Univ. Extension, Ames.
Sawyer, J.E., J.P. Lundvall, and J.A. Hawkins. 2007. In-season nitrogen management for corn production. p. 38-45. In Proc. Thirty-Seventh North Central Extension-Industry Soil Fertility Conf., Des Moines, IA. 14-15 Nov. 2007. Vol. 23. International Plant Nutrient Inst., Brookings, SD.
Sawyer, J.E. 2006. Managing nitrogen for high corn yields. p. 191-199. In Proc. 18th Annual Integrated Crop Manag. Conf., Ames, IA. 29-30 Nov. 2006. Iowa State Univ., Ames, IA.
Lang, B., J. Sawyer, and S. Barnhart. 2006. Dealing with sulfur deficiency in northeast Iowa alfalfa production. p. 225-235. In Proc. 18th Annual Integrated Crop Manag. Conf., Ames, IA. 29-30 Nov. 2006. Iowa State Univ., Ames, IA.
Elmore, R., L. Abendroth, J. Sawyer, M. Al-Kaisi, and M. Hanna. 2006. Management considerations for continuous corn production. p. 9-14. In Proc. 18th Annual Integrated Crop Manag. Conf., Ames, IA. 29-30 Nov. 2006. Iowa State Univ., Ames, IA.
Laboski, C.A.M., J.E. Sawyer, D.T. Walters, L.G. Bundy, R.G. Hoeft, G.W. Randall, and T.W. Andraski. 2006. Evaluation of the Illinois nitrogen test in the north central states. p. 86-93. In Proc. Thirty-Sixth North Central Extension-Industry Soil Fertility Conf., Des Moines, IA. 7-8 Nov. 2006. Vol. 22. Potash & Phosphate Inst., Brookings, SD.
Sawyer, J.E., and E.D. Nafziger. 2006. Regional approach to making nitrogen fertilizer rate decisions for corn. p. 68-76. In Proc. 2006 Wisconsin Fertilizer, Aglime, and Pest Manag. Conf. Madison, WI. 17-19 Jan. 2006. Univ. of Wisconsin, Madison, WI.
Sawyer, J.E., and E.D. Nafziger. 2005. Regional approach to making nitrogen rate decisions for corn. In 2005 Indiana Crop Adviser Conference Proc. CD., Indianapolis, IN. 14-15 Dec. 2005. Purdue Univ., West Lafayette, IN.
Sawyer, J.E., and E.D. Nafziger. 2005. Regional approach to making nitrogen rate decisions for corn. p. 143-152. In Proc. 17th Annual Integrated Crop Manag. Conf., Ames, IA. 30 Nov.-1 Dec. 2005. Iowa State Univ., Ames, IA.
Ruiz Diaz, D.A, and J.E. Sawyer. 2005. Assessment of nitrogen supply from poultry manure applied to corn. p. 109-114. In Proc. Thirty-Fifth North Central Extension-Industry Soil Fertility Conf., Des Moines, IA. 16-17 Nov. 2005. Vol. 21. Potash & Phosphate Inst., Brookings, SD.
Sawyer, J.E., and E.D. Nafziger. 2005. Regional approach to making nitrogen rate decisions for corn. p. 16-24. In Proc. Thirty-Fifth North Central Extension-Industry Soil Fertility Conf., Des Moines, IA. 16-17 Nov. 2005. Vol. 21. Potash & Phosphate Inst., Brookings, SD.
Randall, G.W., and J.E. Sawyer. 2005. Nitrogen application timing, forms and additives. p. 59-71. In Proc. Gulf Hypoxia abd Local Water Quality Concerns Workshop, Ames, IA. 26-28 Sep. 2005. Upper Mississippi Sub-basin Hypoxia Nutrient Committee, Iowa State Univ., Ames, IA.
Sawyer, J.E., and G.W. Randall. 2005. Nitrogen rates, p. 59-71. InProc. Gulf Hypoxia abd Local Water Quality Concerns Workshop, Ames, IA. 26-28 Sep. 2005. Upper Mississippi Sub-basin Hypoxia Nutrient Committee, Iowa State Univ., Ames, IA.
Sawyer, J.E. 2004. With high fertilizer prices is it business as usual or should fertilization practices change? p. 163-176. In Proc. 16th Annual Integrated Crop Manag. Conf., Ames , IA. 1-2 Dec. 2004. Iowa State Univ., Ames , IA.
Nafziger, E.D., J.E. Sawyer, and R.G. Hoeft. 2004. Formulating N recommendations in the corn belt using recent data. p. 5-11. In Proc. Thirty-Fourth North Central Extension-Industry Soil Fertility Conf., Des Moines , IA. 17-18 Nov. 2004. Vol. 20. Potash & Phosphate Inst., Brookings , SD.
Sawyer, J.E., D.W. Barker, and J.P. Lundvall. 2004. Using chlorophyll meter readings to determine N application rates for corn. p. 136-143. In Proc. Thirty-Fourth North Central Extension-Industry Soil Fertility Conf., Des Moines , IA. 17-18 Nov. 2004. Vol. 20. Potash & Phosphate Inst., Brookings , SD.
Sawyer, J.E., D.W. Barker, J.P. Lundvall, and M. Al-Kaisi. 2004. Evaluation of the amino-sugar based soil test in Iowa corn production. Proc. Seventeenth Soil/Plant Analyst Workshop, West Des Moines , IA. 24-25 Feb. 2004, N.C. Research Committee on Soil Testing and Plant Analysis (NCR-12) and the Soil and Plant Analysis Council.
Sawyer, J.E., J.P. Lundvall, S. Rakshit, and A.P. Mallarino. 2003. Liquid swine manure nitrogen utilization for crop production. p. 95-112. In Proc. 15th Annual Integrated Crop Manag. Conf., Ames, IA. 3-4 Dec. 2003. Iowa State Univ., Ames, IA.
Sawyer, J.E., D.W. Barker, J.P. Lundvall, and M. Al-Kaisi. 2003. Evaluation of the amino-sugar based soil test in Iowa corn production. p. 125-136. In Proc. Thirty-Third North Central Extension-Industry Soil Fertility Conf., Des Moines, IA. 19-20 Nov. 2003. Potash & Phosphate Inst., Brookings, SD.
Sawyer, J.E., D.W. Barker, and M. Al-Kaisi. 2003. Iowa experience with the Illinois N test. p. 46-54. In Proc. Wisconsin Fertilizer, Aglime and Pest Manag. Conf., Madison, WI. 21-23 Jan. 2003. Univ. of Wisc., Madison, WI.
Sawyer, J.E. 2003. Developing and using the Iowa P-Index. p. 27-34. In Proc. Wisconsin Fertilizer, Aglime and Pest Manag. Conf., Madison, WI. 21-23 Jan. 2003. Univ. of Wisc., Madison, WI.
Sawyer, J.E. and D.W. Barker. 2002. Sulfur application to corn and soybean crops in Iowa. p. 13-24. In. Proc. 14th Annual Integrated Crop Manag. Conf., Ames, IA. 4-5 Dec. 2002. Iowa State Univ., Ames, IA.
Sawyer, J.E. and D.W. Barker. 2002. Corn and soybean response to sulfur application on Iowa soils. p. 157-163. In Proc. Thirty Second North Central Extension-Industry Soil Fertility Conf., Des Moines, IA. 20-21 Nov. 2002. Potash and Phosphate Inst., Brookings, SD.
Boyd, P.M., H.M. Hanna, J.L. Baker, T.S. Colvin, and J.E. Sawyer. 2002. Field corn tests to examine anhydrous ammonia manifold variability. ASAE paper number 021024. St. Joseph MI, ASAE.
Sawyer, J.E. and D. Barker. 2001. In-season nitrogen fertilization of soybean. p. 158-161. In Proc. Thirty First North Central
Extension-Industry Soil Fertility Conf., Des Moines, IA. 14-15 Nov. 2001. Potash and Phosphate Inst., Brookings, SD.
Sawyer, J.E. 2001. Nitrogen fertilizer and swine manure application to soybean. p. 33-44. In. Proc. 13th Annual Integrated Crop Manag. Conf., Ames, IA. 5-6 Dec. Iowa State Univ., Ames, IA.
Mallarino, A.P., B. M. Stewart, J.L. Baker, J.A. Downing, and J. Sawyer. 2001. Background and basic concepts of the Iowa phosphorus index. p. 63-71. In Proc. Agriculture and the Environment: State and Federal Water Initiatives conference, Ames, IA. 5-7 March. Iowa State Univ., Ames, IA.
Sawyer, J.E. 2000. Methods to Determine Risk of Phosphorus Loss From Farm Fields. p. 197-201. In Proc. Integrated Crop Manag. Conf., Ames, IA. 29-29 Nov. Iowa Sate Univ., Ames, IA.
Kassel, P., J.E. Sawyer, D. Haden, D. Barker. 2000. Soil pH and corn-soybean rotation yield responses to limestone application and tillage. p. 193. In Proc. Thirtieth North Central Extension-Industry Soil Fertility Conf., St. Louis, MO. 15-16 Nov. Potash and Phosphate Inst., Brookings, SD.
Sawyer, J.E. 2000. Nutrient Management - What's Doable. p. 15-24. In Proc. Iowa State University Agriculture and the Environment: A Wake-Up Call for Iowans, Ames, IA. 7-8 March. Iowa Sate Univ., Ames, IA.
Sawyer, J.E. and A.P. Mallarino. 1999. Differentiating and Understanding the Mehlich, Bray, and Olsen Soil Phosphorus Tests. p. 75-80. In Proc. University of Minnesota Crop Pest Management Short Course Program, St. Paul, MN. 22-23 Nov. Univ. of Minnesota, Minneapolis, MN
Sawyer, J.E. 1999. Making Every Fertilizer Dollar Pay. p. 63-78. In Proc. Integrated Crop Manag. Conf., Ames, IA. 1-2 Dec. Iowa State Univ., Ames, IA.
Sawyer, J.E. 1998. Managing Crop Nutrients and Limestone with Reduced Financial Resources. p. 33-36. In Proc. Integrated Crop Manag. Conf., Ames, IA. 17-18 Nov. Iowa State Univ., Ames, IA.
Sawyer, J.E. 1998. Managing Crop Nutrients and Limestone - Reducing Production Costs. In Farm Economy Issues Paper. Iowa State Univ. Extension, Ames, IA
Sawyer, J.E. 1997. Nightmare on yield street. p. 9-19. In Proc. 1997 Fert., Aglime and Pest Manag. Conf., Middleton, WI. 20-22 Jan. 1997. Univ. Wisconsin, Madison, WI.
Sawyer, J.E. 1977. The CCA Program: What's Right, What's Wrong, What's in Our Future. p. 126-133. In Proc. 1997 Illinois Agricultural Pesticides Conf., Urbana, IL. 8-9 Jan. 1997. Univ. of Illinois, Urbana, IL
Sawyer, J.E. 1996. Should yield maps correlate to soil tests and nightmare on yield street. 1996 Information Agriculture Conf., Urbana, IL. 30 July-Aug. 1. Potash and Phosphate Institute, Atlanta, GA.
Sawyer, J.E, and R. Milby. 1994. Realities of providing site-specific services to customers. p. 81-89. In Proc. Integrated Crop Manag. Conf., Ames, IA. 30 Nov.-1 Dec. Iowa State Univ., Ames, IA.
Sawyer, J.E. 1994. Grid sampling: the worth of information. p.148-151. In Proc. 24th North Cent. Ext.-Ind. Soil Fert. Workshop, St. Louis, MO. 26-27 Oct. Potash and Phosphate Inst., Manhattan KS.
Sawyer, J.E. 1993. How you may fit into the certified crop adviser (CCA) program. p. 143-147. In Proc. 1993 Fert., Aglime and Pest Manag. Conf. Middleton, WI. 19-21 Jan. 1993. Univ. Wisconsin-Extension, Madison, WI.
Sawyer, J., B. Lang, and D. Barker. 2008. Evaluation of corn response to sulfur fertilization in northeast Iowa. Project report for 2006 and 2007 research. Iowa State Univ., Dept. of Agronomy, Ames, IA.
Sawyer, J., and D. Barker 2008. Illinois soil nitrogen test evaluation, 2006-2007 final project report. Final report to the Iowa State University, College of Agriculture Corn and Soybean Initiative.
Pedersen, P., J. Sawyer, D. Barker, D. Ruiz Diaz, and J. Stuart. 2008. Educating growers about living mulch systems for grain crop production. Final project report to the Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation, IFLM program.
Mallarino, A.P., J.E. Sawyer, D. Kaiser, D. Ruiz-Diaz, B. Allen, D. Barker, and D. Wittry. 2007. Demonstration of Agronomic and Environmentally Sound Utilization of Nitrogen and Phosphorus in Poultry Manure. Final project report to the Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation, IFLM program.
Sawyer, J., J. Lundvall, and J. Hawkins. 2007. Demonstration of in-season nitrogen management strategies for corn production. Final project report to the Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation, IFLM program.
Sawyer, J.E., and M. Al-Kaisi. 2005. Soil nitrogen and carbon management project. Final project report to the Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation, IFLM program.
Sawyer, J., J. Lundvall, and J. Hawkins. 2005. Demonstration of in-season nitrogen management strategies for corn production. Crop year 2004 project report to the Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation, IFLM program.
Sawyer, J., A. Mallarino, and J. Lundvall. 2005. Swine manure nutrient utilization project. Final project report to the Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation, IFLM program.
Lorimor, J, and J.E. Sawyer. 2004. Swine USA anaerobic digester performance analysis. Part 1. 12 p. Final project report, Iowa NRCS, Des Moines, IA.
Loria, E.R., J.E. Sawyer, and J.C. Lorimor. 2004. Use of anaerobically digested swine manure in corn production. Part 2. 32 p. Final project report, Iowa NRCS, Des Moines, IA.
Sawyer, J.E., and D. Barker. 2003. Soil nitrogen and carbon management project. In Research Farm annual reports, Iowa State University, Ames, IA.
Kanwar, R., C. Pederson, A. Mallarino, J. Baker, J. Sawyer, and K. Pecinovsky. 2003. Fertilizer and swine manure management systems. 1. Impacts on crop production and nitrate-nitrogen leaching with subsurface drainage. In Northeast Research Farm annual report. Iowa State University, Ames, IA.
Mallarino, A.P., R. Kanwar, K. Pecinovsky, C. Pederson, J. Klatt, J. Baker, and J. Sawyer. 2003. Fertilizer and swine manure management systems. 2. Impacts on agronomic and environmental soil phosphorus tests and on phosphorus loss with subsurface drainage. In Northeast Research Farm annual report. Iowa State University, Ames, IA.
Sawyer, J.E. and D. Barker. 2000-2003. Seasonal and rotation influences on corn nitrogen requirements. In Research Farm annual reports, Iowa State University, Ames, IA.
Sawyer, J.E. and D. Barker. 2001-2002. Sulfur fertilizer application to corn and soybean. In Research Farm annual reports, Iowa State University, Ames, IA.
Sawyer, J.E. and D. Barker. 2000. Mid-season nitrogen fertilization of soybeans. In Research Farm annual reports, Iowa State University, Ames, IA.
Sawyer, J.E., and S.A. Ebelhar. 1993. Wheat response to sulfur fertilization in southern Illinois. p. 51-75. In R.G. Hoeft (ed.) Illinois Fert. Conf. Proc., Springfield, IL. 25-27 Jan. 1993. Univ. of Illinois, Urbana, IL.
Clark, K.N., T.R. Peck, and J.E. Sawyer. 1993. Comparison of plow-layer distributed and surface applied limestone for no-till crop production. p. 127-136. In R.G. Hoeft (ed.) Illinois Fert. Conf. Proc., Springfield, IL.25-27 Jan. 1993. Univ. of Illinois, Urbana, IL.
Sawyer, J.E., and R.G. Hoeft. 1989. The manure challenge. Dealer Progress. 20:34-35.
Hoeft, R.G., and J.E. Sawyer. 1987. Maximize benefits or minimize risks when using livestock wastes. p. 7-12. In Livestock Waste Manag. Conf., Champaign, IL. 24 March 1987. Univ. of Illinois, Urbana, IL.
Sawyer, J.E., and E. Nafziger. 2007. Changes in nitrogen guidelines for corn in the Midwest. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Nafziger, E.D., and J.E. Sawyer. 2007. A new approach to formulating N rate guidelines for corn. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Pedersen, P., J. Sawyer, J. Stuart, and D. Barker. 2007. Educating growers about kura clover living mulch systems for grain crop production. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Hendrickson, L., G. Ostermeier, and J. Sawyer. 2007. Use of aerial imagery in making effective nitrogen recommendations. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Barker, D.W., and J.E. Sawyer. 2007. Evaluation of crop canopy sensors for in-season N rate management in corn. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Kaiser, D.E., A.P. Mallarino, D.J. Wittry, B.L. Allen, and J.E. Sawyer. 2007. Availability of poultry manure phosphorus for corn and application impacts on soil phosphorus. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Ruiz Diaz, D.A., J.E. Sawyer, D.W. Barker, and A.P. Mallarino. 2006. Assessment of nitrogen supply from poultry manure applied to corn. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Holmes, J.D., P.A. Kassel, J.E. Sawyer, and D.A. Ruiz Diaz. 2006. Evaluation of ground eggshells as a liming material. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Hawkins, J.A., J.E. Sawyer, and J.P. Lundvall. 2005. Demonstration of in-season nitrogen management for corn production. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Sawyer, J.E., D.W. Barker, and J.P. Lundvall. 2004. Using chlorophyll meter readings to determine N application rates for corn. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Lundvall, J.P., J.E. Sawyer, S. Rakshit, A.P. Mallarino, and D.W. Barker. 2003. Liquid swine manure impact on first-year soybean and residual year corn. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Sawyer, J.E., D.W. Barker, and M. Al-Kaisi. 2003. Evaluation of the Illinois N soil test on Iowa soils. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Kruse, M., M. Al-Kaisi, and J.E. Sawyer. 2003. Nitrogen management effect on soil carbon change and carbon dioxide release under a corn-soybean rotation. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Kruse, M.L., M. Al-Kaisi, and J.E. Sawyer. 2003. Nitrogen management effect on soil carbon dioxide emission. Iowa Academy of Sciences Annual Meeting, April 25-26, 2003, Des Moines, IA. Iowa Academy of Sciences, Cedar Falls, IA.
Kruse, M.L., M. Al-Kaisi, and J.E. Sawyer. 2003. Nitrogen management effects on soil carbon dioxide emission. Fourth annual North Central Region Symposium on Natural Organic Matter in Soils and Water. March 21-22, 2003, Ames, IA. Iowa State Univ., Ames, IA.
Rakshit, S., J.E. Sawyer, J.P. Lundvall, D.W. Barker, and A.P. Mallarino. 2002. Liquid swine manure nitrogen utilization project. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI. Sawyer, J.E., E.R. Loria, D.W. Barker, and J.C. Lorimor. 2002. Use of anaerobic digested swine manure in corn production. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Loria, E.R., J.E. Sawyer, and J.C. Lorimor. 2002. Comparison of phosphorus and nitrogen from raw and anaerobic digested swine manure. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Barbazan, M., A. Mallarino, and J. Sawyer. 2002. Liquid swine manure phosphorus utilization in corn-soybean production. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Barbazan, M.M., A.P. Mallarino, A. Atia, and J.E. Sawyer. 2001. Evaluation of phosphorus availability in manured soils by soil testing and plant analysis. In Annual Meetings Abstract CD-ROM, ASA, Madison, WI.
Mallarino, A.P., B.M Stewart, J.L. Baker, J.A Downing, T.E. Fenton, J.E. Sawyer, G.A. Miller, J.L. Kovar, T.J. Sauer, R.D. Voss. 2001. Phosphorus Indexing in Cropland: The Iowa P Index. Soil Water Cons. Soc. 2001 Annual Meeting.
Sawyer, J.E. and D.W. Barker. 2000. In-season nitrogen fertilization of soybean. p. 286. In Agronomy abstracts, ASA, Madison, WI.
Mallarino, A.P., J.L. Baker, J.A. Downing, T.E. Fenton, G.A. Miller, J.E. Sawyer, B.M. Stewart, J.L. Kovar. 2000. Development of a phosphorus assessment tool for Iowa. p. 328. In Agronomy abstracts, ASA, Madison, WI.
Kassel, P., J.E. Sawyer, D. Haden, S. Parker. 1999. Soil pH and corn-soybean rotation yield responses to limestone application and tillage. p. 260. In Agronomy abstracts, ASA, Madison, WI.
Sawyer, J.E., and R.M. Vanden Heuvel. 1995. Preplant anhydrous ammonia knife spacing for corn production. p. 315. In Agronomy Abstracts, ASA, Madison, WI.
Clark, K.N., T.R. Peck, and J.E. Sawyer. 1994. A comparison of plow layer distributed versus surface applied limestone in no-till crop production. p. 321. In Agronomy abstracts, ASA, Madison, WI.
Sawyer, J.E., and R.G. Hoeft. 1992. Effect of injected liquid beef manure on soil chemical properties and corn root distribution. p. 279. In Roots of Plant Nutrition Conf., Champaign, IL. 8-10 July 1992. Potash and Phosphate Institute, Atlanta GA.
Ebelhar, S.A., and J.E. Sawyer. 1992. Wheat response to sulfur fertilization in southern Illinois. p. 276. In Agronomy abstracts, ASA, Madison, WI.
Sawyer, J.E., L.E. Paul, S.A. Ebelhar, and R.G. Hoeft. 1991. Sidedress anhydrous ammonia knife spacing for corn production. p. 300. In Agronomy abstracts, ASA, Madison, WI.
Sawyer, J.E., R.G. Hoeft, and L.V. Boone. 1989. Effect of lime quality on soil pH. p. 251. In Agronomy abstracts, ASA, Madison, WI.
Bicki, T.J., L.V. Boone, W.H. Brink, J.W. Hummel, M.J. Mainz, G.A. Raines, J.E. Sawyer, S.K. Sipp, and J.C. Siemens. 1989. Summary of corn, soybean, and sorghum yields for different tillage systems in Illinois. p. 275. In Agronomy abstracts, ASA, Madison, WI.
Sawyer, J.E., and R.G. Hoeft. 1987. Knife injected liquid manure interrelationship with corn row placement and soil chemical transformations. p. 216. In Agronomy abstracts, ASA, Madison, WI.
Sawyer, J.E., M.A. Schmitt, and R.G. Hoeft. 1986. Effect of liquid manure application on soil chemical properties. p. 214-215. In Agronomy abstracts, ASA, Madison, WI.