Germán A. Bollero


Dr. Bollero utilizes advanced statistical methods to define, quantify, and find solutions to increase productivity and profitability of food systems while reducing undesirable impacts of agricultural practices on ecosystems. His accurate modeling and interpretation of cropping system productivity and environmental services drive future agricultural and environmental practices.


  • Ph.D.: Agronomy, University of Illinois at Urbana-Champaign — 1994
  • M.S.: Agronomy, University of Illinois at Urbana-Champaign — 1993
  • B.S.: Agronomy, National University of Rosario, Argentina — 1986

Selected Articles in Journals

  • Farias Neto, A.F. G.L. Hartman, W.L. Pedersen, S. Li, G. Bollero, and B.W. Diers.  2006.  Irrigation and inoculation treatments that increase the severity of soybean sudden death syndrome in the field.  Crop Sci. 46: 2547-2554.
  • Martín, N.F., G.A. Bollero, N.R. Kitchen, A.N. Kravchenko, K. Sudduth, W.J. Wiebold, and D.G. Bullock. 2006. Two classification methods for developing and interpreting productivity zones using site properties. Plant Soil 288: 357-371.
  • Ruffo, M.L., G.A. Bollero, D.S. Bullock, and D.G. Bullock. 2006. Site-specific production functions for variable rate corn nitrogen fertilization. J. Precision Agric. 7:327–342.
  • Villamil, M.B., G.A. Bollero, R.G. Darmody, F.W. Simmons, and D.G. Bullock. 2006. No-till corn-soybean systems including winter cover crops: effects on soil properties. Soil. Sci Soc. Am. . J. 70:1936-1944.
  • Miguez, F.E. and G.A. Bollero. 2006. Winter cover crops in Illinois: evaluation of ecophysiological characteristics of corn. Crop Sci. 46: 1536-1545.
  • Morgan P.B., T.A. Mies, G.A. Bollero, R.L. Nelson, and S.P. Long. 2006. Season-long elevation of ozone concentration to projected 2050 levels under fully open-air conditions substantially decreases the growth and production of soybean. New phytologist 170:333-343.
  • Bierman, R.E., D.E. Riechers, C.L. Sprague, G. Bollero, and W.L. Pedersen. 2006. Fungicide-herbicide interaction in soybean (Glycine max). Crop Prot. 25: 134-139.
  • Rayburn, A.L.,R. McCloskey, T. C. Tatum, G. A. Bollero, M. R. Jeschke, and P. J. Tranel. 2005. Genome Size Analysis of Weedy Amaranthus Species. Crop Sci. 45:2557-2562.
  • Ruffo, M.L., G. A. Bollero, D.G. Bullock, and R.G. Hoeft. 2005. Spatial Variability of the Illinois Soil Nitrogen Test: Implications for Soil Sampling. Agron. J. 97:1484-1492.
  • Miguez, F.E. and G.A. Bollero. 2005. Review of corn yield response under winter cover cropping systems using meta-analytic methods. Crop Sci. 45:2318-2329.
  • Dann H. M., D. E. Morin, G.A. Bollero, M. R. Murphy, and J. K. Drackley. 2005. Prepartum intake, postpartum induction of ketosis, and periparturient disorders affect the metabolic status of dairy cows. Journal of Dairy Science 88: 3249-3264.
  • K.A. Sudduth, N.R. Kitchen, W.J. Wiebold, W.D. Batchelor, G.A. Bollero, D.G. Bullock, D.E. Clay, H.L. Palm, F.J. Pierce, R.T. Schuler, K.D. Thelen. 2005. Relating apparent electrical conductivity to soil properties across the north-central USA Computers And Electronics In Agriculture 46: 263-283.
  • Adee, E.A., Paul, L. E., Nafziger, E. D., and Bollero, G. 2005. Yield loss of corn hybrids toincremental defoliation. Online. Crop Management doi:10.1094/CM-2005-0427-01-RS.
  • Morgan, P.B., G.A. Bollero, R.L. Nelson, F.G. Dohleman and S.P. Long. 2005. Increase in above-ground net primary production and yield of soybean is less when [CO2] is elevated in the open. Global Change Biology 11:1-10.
  • Martin, N. F., G.A. Bollero and D.G. Bullock. 2005. Associations between field characteristics and soybean plant performance using canonical correlation analysis. Plant Soil 273:39-55.
  • Crandall, S.M., M.L. Ruffo, and G.A. Bollero. 2005. Cropping system and nitrogen dynamics under a cereal winter cover crop preceding corn. Plant Soil 268:209-219.
  • Ruffo, M. L., D. G. Bullock, and G. A. Bollero. 2004. Soybean yield as affected by biomass and nitrogen uptake of cereal rye in winter cover crop rotations. Agron. J. 96:800-805.
  • Yeater, K.M., G.A. Bollero, D.G. Bullock, and A.L. Rayburn. 2004. Flow cytometric analysis for ploidy level differentiation of 45 hairy vetch accessions. Anal. Appl. Biol. 145:123-127.
  • Officer, S. J., A. N. Kravchenko, G. A. Bollero, K. A. Sudduth, N. R. Kitchen, W. J. Wiebold, H. L. Palm, and D. G. Bullock. 2004. Relationships between soil bulk electrical conductivity and the principal component analysis of topography and soil fertility values. Plant Soil. 258: 269-280.
  • Yeater, K.M., G.A. Bollero, D.G. Bullock, A.L. Rayburn, and S. Rodriguez-Zas. 2004. The use of canonical discriminant analysis for selection of hairy vetch. Crop Sci. 44:185-189.
  • Young, B.G., J.M. Young, J.L. Matthews, M.D.K. Owen, I.A. Zelaya, R.G. Hartzler, L.M. Wax, K.W. Rorem, and G.A. Bollero. 2003. Soybean development and yield as affected by three postemergence herbicides. Agron. J. 95: 1152-1156.
  • Ruffo, M. L., F. O. Garcia, G. A. Bollero, K. Fabrizzi, and R. A. Ruiz. 2003. Effects of nitrogen fertilizer on sunflower in South-East Buenos Aires, Argentina. Commun. Soil Sci. Plant Anal. 34:2645-2657.
  • Yeater, K.M., G.A. Bollero, D.G. Bullock, A.L. Rayburn, and S. Rodriguez-Zas. 2003. The use of canonical discriminant analysis for selection of hairy vetch. Crop Sci. 44:185-189.
  • Steckel, L.E., C.L. Sprague, A.G. Hager, F.W. Simmons, and G.A. Bollero. 2003. Effects of shading on common waterhemp growth and development. Weed Sci. 51:898-903.
  • Hager A.G., L.M. Wax, E.W. Stoller, and G.A. Bollero. 2003. Influence of diphenylether herbicide application rate and timing on common waterhemp control in soybean. Weed Tech. 17:14-20.
  • Ruffo, M.L., and G.A. Bollero. 2003. Residue decomposition and C and N release rates prediction based on biochemical fractions using principal component regression. Agron. J. 95: 1034-1040.
  • Ruffo, M.L., and G.A. Bollero. 2003. Modeling rye and hairy vetch residue decomposition as a function of degree-days and decomposition-days. Agron. J. 95: 900-907.
  • Sudduth, K.A., N.R. Kitchen, G.A. Bollero, and D.G. Bullock. 2003. Comparison of electromagnetic induction and direct sensing of soil electrical conductivity. Agron. J. 95: 472-482..
  • Taylor-Lovell, S., L.M. Wax, and G.A. Bollero. 2002. Preemergence flumioxazin and pendimethalin and postemergence herbicide systems for soybean (Glycine max) Weed Tech. 16: 502-511.
  • Hager A.G., L.M. Wax, G.A. Bollero, and F.W. Simmons. 2002. Common waterhemp (Amaranthus rudis Sauer) management with soil-applied herbicides in soybean (Glycine max (L) Merr.). Weed Sci. 5: 607-610.
  • Hadley, C.I., K.R. Olson, G. A. Bollero, and G.E. Pepper. 2002. Predicting forage yields using properties of Illinois soils, USA. Pakistan J. Agron. 1:1-8.
  • Hager A.G., L.M. Wax, E.W. Stoller, and G.A. Bollero. 2002. Common waterhemp (Amaranthus rudis) interference in soybean. Weed Sci. 5: 607-610.
  • McGuire N.C., R. Schulman, M.D. Ridgway, and G. A. Bollero. 2002. Detection of occult urinary tract infections in dogs with diabetes mellitus. J. Amer. Anim. Hospital Assoc. 38: 541-544.
  • Kravchenko A.N., G.A. Bollero, R.A. Omonode, and D.G. Bullock. 2002. Quantitative mapping of soil drainage classes using topographical data and soil electrical conductivity. Soil. Sci. Soc. Amer. J. 60:235-243.
  • Ratcliffe S.T., H.M. Robertson, C.J. Jones, G.A. Bollero, and R.A. Weinzierl. 2002. Assessment of parasitism of house fly and stable fly pupae (Diptera: Muscidae) by pteromalid (Hymenoptera: Pteromalidae) parasitoids using polymerase chain reaction. J. Med. Entomol. 39: 52-60
  • Woolery, M.E., K.R. Olson, J. O. Dawson, and G. A. Bollero. 2002. Using soil properties to predict forest productivity in southern Illinois. J. Soil Water Conserv. 57:37-45.
  • Wander, M.M., G.L. Walter, T.M. Nissen, G.A. Bollero, S.S. Andrews, and D.C. Cavanaugh-Grant. 2002. Soil quality: Science and process. Agron. J. 94:23-32.
  • Cooperband, L.R. G.A. Bollero, and F.J. Coale. 2002. Effect of poultry litter and composts on soil nitrogen and phosphorus availability and corn production. Nutrient Cycling in Agroecosystems 62: 185-194.