Emerson Dale Nafziger

Professor Emeritus

Primary Disciplines

Research Interests

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

Selected Articles in Journals

  • 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.