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The focus of Bart’s research program at NPARL will be to work collaboratively with other NPARL scientists to investigate alternative irrigated cropping strategies and to investigate their impact on weed management, soil quality and conservation, water and nutrient use efficiency, and economic and environmental sustainability.

Prior to joining the USDA-Agricultural Research Service in 2005, Bart was a Soil Scientist at the University of Wyoming Powell Research and Extension Center where his research focused on improving efficiency of N fertilization practices for sugarbeet and dry bean using variable rate technology, improved application timing, and proper N source selection.  While at the University of Wyoming, Bart also investigated the interaction of micronutrient management and weed control practices in sugarbeet.  Before beginning his work in Wyoming Bart worked for two years as a post-doctoral research associate at the University of Nebraska West Central Research and Extension Center.  While there, he conducted research on use of industrial byproducts (sugarbeet processing lime and coal fly ash) for liming agricultural soils, micronutrient management in corn, and variable rate N management.  Bart’s graduate work ranged from investigating the iron deficiency stress mechanism of soybean to the effect of different management practices on soil N transformations and N use efficiency.

• Stevens, W.B., and A.O. Mesbah.  2004.  Zinc enhances sugar beet emergence and yield on high-ph soils of marginal zinc status.  Online. Crop Management doi:10.1094/CM-2004-0805-01-RS.

• Mesbah, A.O., and W.B. Stevens.  2004. Redstem filaree control in sugarbeet.  Online. Crop Management 10.1094/CM-2004-0826-01-RS.

• Stevens, W.B., R.G. Hoeft, and W.R. Peterson.  2003.  Nitrogen fertilizer requirement for inbred corn following corn or soybean.  Online. Crop Management doi:10.1094/CM-2003-1126-01-RS.

• McCallister, D.L., K.D. Frank, W.B. Stevens, G.W. Hergert, and R.R. Renken.  2002.  Coal fly-ash as an acid-reducing soil amendment and its side effects.  (Soil Sci. 167:811-820).

• Bernards, M.L. V.D. Jolley, W.B. Stevens and  G.W. Hergert.  2002.  Phytosiderophore release from nodal, primary, and complete root systems in maize.  Plant Soil 241:105-113.

• Stevens, W.B., R.L. Mulvaney, S.A. Khan and R.G. Hoeft.  2000.  Improved diffusion methods for nitrogen and nitrogen-15 analysis of Kjeldahl digests.  Journal of AOAC (Association of Official Analytical Chemists) International 83:1039-1046.

• Mulvaney, R.L., S.A. Khan, G.K. Sims, and W.B. Stevens.  1997.  Use of nitrous oxide as a purge gas for automated nitrogen isotope analysis by the Rittenberg technique.  Journal of Automated Chemistry 19:165-168.

• Mulvaney, R.L., S.A. Khan, W.B. Stevens, and C.S. Mulvaney.  1997.  Improved diffusion methods for determination of inorganic nitrogen in soil extracts and water.  Biology and Fertility of Soils 24:413-420.

• Jolley, V.D., K.A. Cook, N.C. Hansen, and W.B. Stevens.  1996.  Plant physiological responses for genotypic evaluation of iron efficiency in strategy I and II plants - A review. Journal of Plant Nutrition 19:1241-1255.

• Stevens, W.B., V.D. Jolley, and N.C. Hansen.  1994.  Diurnal rhythmicity of root iron-reducing activity in soybean as affected by various light regimes. Journal of Plant Nutrition 17:2193-2204.

• Stevens, W.B., V.D. Jolley, N.C. Hansen, and D.J. Fairbanks.  1994.  Modified procedures for commercial adaptation of root iron-reducing capacity for use as a screening technique. Journal of Plant Nutrition  16:2507-2519.

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