Emerson Dale Nafziger

Professor Emeritus

Dr. Nafziger turns agronomic data collected from research throughout Illinois into tools that help producers better manage crops by predicting responses to crop inputs. He created a data-driven nitrogen rate calculator, an online resource that assists producers in improving nitrogen management for corn in most of the largest corn-producing states.

Primary Disciplines

Research Interests

  • 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 soybeans
  • Variety testing
  • Nitrogen and hybrid interactions
  • New N rate guidelines and on-farm corn N rate trials
  • Weed management in corn and soybeans

Selected Articles in Journals

  • Nafziger, E.D., and H.R. Koller. 1976. Influence of leaf starch concentration of CO2 assimilation in soybean. Plant Physiol. 57:560-563.
  • 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., 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.
  • 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. 1984. The use of demonstration plots as extension tools. J. Agron. Ed. 13:47-49.
  • 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., 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., 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • Nafziger, E.D., P.R. Carter, and E.E. Graham. 1991. Response of corn to uneven emergence. Crop Sci. 31:811-815.
  • 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. 1992. Seed size effects on yields of two corn hybrids. J. Prod. Agric. 5:538-540.
  • 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.
  • 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. 1994. Root size and distribution of field-grown wheat genotypes. Crop Sci. 34:810-812.
  • 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.
  • Nafziger, E.D. 1994. Corn planting date and plant population. J. Prod. Agr. 7:59-62.
  • Nafziger, E.D. 1996. Effects of missing and two-plant hills on corn grain yield. J. Prod. Agr. 9:238-240.
  • 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.
  • 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.
  • Graeber, J.V., E.D. Nafziger, and D.W. Mies. 1999. Evaluation of transgenic, Bt-containing corn hybrids. J. Prod. Agric. 12:659-663.
  • 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.
  • 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.
  • 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.
  • 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. 2004. Phosphorus runoff from incorporated and surface-applied liquid swine manure and phosphorus fertilizer. J. Environ. Qual. 33:1535-1544.
  • 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.
  • Nafziger, E. D. 2006. Inter- and intraplant competition in corn. Online. Crop Management doi:10.1094/CM-2006-0227-05-RV.
  • 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.
  • Coulter, J.A. and E.D. Nafziger. 2007. Planting date and glyphosate timing on soybean. Weed Technol. 21:359-366.
  • 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
  • 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