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Fluid Journal : Fluid Journal 2005-2007
Winter 2005 Fluid Journal 3 ultra-high protein hybrid responded linearly to increasing N supply, while protein concentration in the low-protein hybrids was not influenced by the N supply. While these data demonstrate the strong genetic control that is exerted over grain composition, they also show the interactive effects of N supply and genotype that can alter grain composi- tion. This finding has important ramifications for N fertilizer usage, as high protein hybrids would require more fertilizer N than low protein hybrids to achieve their higher grain protein. Thus, large changes in grain protein percent- age (or potentially other grain quality components) resulting from genetic selection of biotechnology would undoubtedly alter the relationship between grain productivity and N needs, thereby changing the absolute requirements for fertilizer nutrients. Methodology These trials included corn hybrids with wide variation in grain protein percentage and were conducted between 2000 and 2003 at the Crop Sciences Research and Education Center in Champaign, the Northern Illinois Agronomy Research Center in DeKalb, and the Joliet Junior College Demonstration and Research Center in Joliet. Fifteen different hybrid/N rate combinations were used.All trials involved incremental increases in fertilizer N rate (usually 0 to 210 lbs/A in 30- or 40-lb increments) always supplied as ammonium sulfate. All trials were part of statistically replicated and randomized experiments and all demonstrated significant N- induced increases in grain yield and grain protein concentration. Dr. Below is professor of crop physiol- ogy, Ms. Seebauer is senior research specialist, and Mr. Uribelarrea is graduate research assistant in the Department of Crop Sciences at the University of Illinois, Urbana, IL.
Fluid Journal 2002-2004
Fluid Journal 2008-2009