Areas of Expertise

• Grain crop management, with most emphasis on corn, soybean, and winter wheat production, and some knowledge of "alternative" crops
  • Corn response to plant population, planting date, and row spacing
    
  • Effects of weather problems — drought, hail, frost flooding — on corn growth and yield potential, and on management responses to such problems
    
  • Nitrogen nutrition
    
  • Hybrid and variety performance testing and selection
    
  • Specialty corn hybrid production and management
    
  • Site-specific input management (precision farming)
• Issues regarding use of genetically enhanced corn hybrids
• Field diagnosis of growth and development problems
• Design and analysis of on-farm research to test and confirm usefulness of management practices
• Crop rotation effects

Current Research Projects & Demonstrations

• Measuring the effect of crop rotation on response of corn to N fertilizer
• Cropping sequence and practices as they affect crop yield and yield stability
• Planting date and plant population effects on corn yield
• Simulated hail effects on corn
• Micronutrient and seed inoculant effects on corn and soybean
• Variety testing
• Nitrogen and hybrid interactions
• New N rate guidelines and on-farm corn N rate trials
• Weed management in corn and soybean

Current Issues in Crop Production

• Effects of crop rotation on yield and yield stability, as rotations shift to respond to changing demand
• Acceptability and economic value to producers of genetically enhanced crops
• Economic and environmental optimization of inputs to crop production
• Planting date and seeding rate optimization in corn and soybean
• The interaction of crop production techniques with pest management
• Designing and implementing effective on-farm, adaptive research
• Value to producers of precision farming techniques
• Understanding crop growth and development, as affected by crop management and stress

Refereed Journal Articles

• Nordby, D.E., D.L. Alderks, and E.D. Nafziger. 2008. Competitiveness with weeds of soybean cultivars with different maturity and canopy width characteristics. Weed Technol. 22:in press
• Adee, E.A., E.D. Nafziger, and L.E. Paul. 2007. Optimizing plant population and nitrogen rate for high-oil corn. Online. Crop Management in press:
• Coulter, J.A. and E.D. Nafziger. 2007. Planting date and glyphosate timing on soybean. Weed Technol. 21:359-366.
• 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 University Extension, Ames, Iowa.
• Nafziger, E. D. 2006. Inter- and intraplant competition in corn. Online. Crop Management doi:10.1094/CM-2006-0227-05-RV.
• Adee, E. A., Paul, L. E., Nafziger, E. D., and Bollero, G. 2005. Yield loss of corn hybrids to incremental defoliation. Online. Crop Management doi:10.1094/CM-2005-0427-01-RS.
• Daverede, I.C., A.N. Kravchenko, R.G. Hoeft, E.D. Nafziger, D.G. Bullock, J.J. Warren, and L.C. Gonzini. 2004. Phosphorus runoff from incorporated and surface-applied liquid swine manure and phosphorus fertilizer. J. Environ. Qual. 33:1535-1544.
• Thomison, P. R., and Nafziger, E. D. 2003. Defoliation affects grain yield, protein, and oil of TopCross high-oil corn. Online. Crop Management doi:10.1094/CM-2003-1027-01-RS.
• Daverede, I.C., A.N. Kravchenko, R.G. Hoeft, E.D. Nafziger, D.G. Bullock, J.J. Warren, and L.C. Gonzini. 2003. Phosphorus runoff: effect of tillage and soil phosphorus levels. J. Environ. Qual. 32:1436-1444.
• Boote, K.D., J. W. Jones, W. D. Batchelor, E. D. Nafziger, and O. Myers. 2003. Genetic coefficients in the CROPGRO–soybean model: links to field performance and genomics. Agron. J. 95: 32-51.
• Majchrzak, R.N., K.R. Olson, G Bollero, and E.D. Nafziger. 2001. Using soil properties to predict wheat yields on Illinois soils. Soil Sci.166: 267-280.
• Graeber, J.V., E.D. Nafziger, and D.W. Mies. 1999. Evaluation of transgenic, Bt-containing corn hybrids. J. Prod. Agric. 12:659-663.
• Bullock, D.G., D.S. Bullock, E.D. Nafziger, T. Doerge, S. Paszkiewicz, P. Carter, and T.A. Peterson.  1998.  Does variable rate seeding of corn pay?. Agron. J. 90:830-836.
• Ritchie, K.B., R.G. Hoeft, E.D. Nafziger, L.C. Gonzini, and J.J. Warren.  1997.  Starters perform more consistently than seed-placed fertilizers. Fluid Journal 4:18-21.
• Nafziger, E.D.  1996.  Effects of missing and two-plant hills on corn grain yield.  J. Prod. Agr. 9:238-240.
• Nafziger, E.D.  1994.  Corn planting date and plant population.  J. Prod. Agr. 7:59-62.
• Mian, M.A.R. and E.D. Nafziger.  1994.  Seed size and water potential effects on germination and seedling growth of winter wheat.  Crop Sci. 34:169-171.
• Mian, M.A.R., E.D. Nafziger, F.L. Kolb, and R.H. Teyker.  1994.  Root size and distribution of field-grown wheat genotypes.  Crop Sci. 34:810-812.
• Thompson, S., R.J. Hauser, H.D. Guither, and E.D. Nafziger.  1993.  Evaluating alternative crops from a marketing perspective:  the case of canola.  J. Prod. Agric. 6:575-584.
• Mian, M.A.R., E.D. Nafziger, F.L. Kolb, and R.H. Teyker.  1993.  Root growth of wheat genotypes in hydroponic culture and in the greenhouse under different soil moisture regimes.  Crop Sci. 33:283-286.
• Nafziger, E.D.  1992.  Seed size effects on yields of two corn hybrids.  J. Prod. Agric. 5:538-540.
• Mian, A.R. and E.D. Nafziger.  1992.  Seed size effects on emergence, head number, and grain yield in winter wheat.  J. Prod. Agric. 5:265-268.
• Nafziger, E.D., P.R. Carter, and E.E. Graham.  1991.  Response of corn to uneven emergence.  Crop Sci. 31:811-815.
• Bahadar, K.B. and E.D. Nafziger.  1990.  Common cocklebur and velvetleaf interference with soybean grown at different densities and planting patterns. Agron. J. 82:531-534.
• Regnier, E.E., E.W. Stoller, and E.D. Nafziger. 1989. Common cocklebur (Xanthium strumarium L.) root and shoot interference in soybean (Glycine max L.).  Weed Sci. 37:308-313.
• Willmot, D.B., G.E. Pepper, and E.D. Nafziger. 1989. Random stand deficiency and replanting delay effects on soybean yield, yield components, canopy, and morphological responses.  Agron J. 81:425-430.
• Stoller, E.W., S.K. Harrison, L.M. Wax, E.E. Regnier, and E.D. Nafziger. 1987. Weed interference in soybeans.  Rev. Weed Sci. 3:155-181.
• Nafziger, E.D., L.M. Wax, and C.M. Brown. 1985. Response of five winter wheat cultivars to growth regulators and increased N.  Crop Sci.  26:767‑770.
• Nafziger, E.D., R.L. Mulvaney, D.L. Mulvaney, and L.E. Paul. 1984. Effect of previous crop on the response of corn to fertilizer nitrogen.  J. Fert. Issues.  1(4):136‑138.
• Nafziger, E.D., J.M. Widholm, H.C. Steinrucken, and J.L. Killmer.  1984.  Selection and characterization of a carrot cell line tolerant to glyphosate.  Plant Physiol.  76:571-574.
• Nafziger, E.D. 1984. The use of demonstration plots as extension tools.  J. Agron. Ed.  13:47-49.
• Nafziger E.D., and F.W. Slife. 1983. Physiological response of common cocklebur (Xanthium pensylvanicum) to glyphosate.  Weed Sci. 31:874-878.
• Nafziger, E.D., J.M. Widholm, and F.W. Slife. 1983. The effects of aspartate and other compounds on glyphosate uptake and growth inhibition in cultured carrot cells.  Plant Physiol.  71:623-626.
• Foley, M.E., E.D. Nafziger, L.M. Wax, and F.W. Slife. 1983. Effect of glyphosate on protein and nucleic acid synthesis and ATP levels in common cocklebur (Xanthium pensylvanicum) root tissue.  Weed Science 31:76-80.
• Nafziger, E.D., and H.R. Koller. 1976. Influence of leaf starch concentration of CO2 assimilation in soybean.  Plant Physiol. 57:560-563.

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