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Fluid Journal : Summer 2015
9 The Fluid Journal Summer 2015 The Fluid Journal • Official Journal of the Fluid Fertilizer Foundation • Summer 2015 • Vol. 23, No. 3, Issue #89 Dr. Ignacio Antonio Ciampitti and Bailey McHenry Reducing variability induced by weather and soil type cited. Summary: The factors that were tested include narrow- row spacing, plant population, balanced nutrition practices, including various timing of nitrogen (N), phosphorus (P) and potassium (K), and micronutrient applications; crop production with fungicide and insecticide application, plant growth regulator effects, and the use of precision Ag technology for maximizing yields, including a GreenSeeker meter for more precisely determining fertilizer N needs for grain sorghum. A high performing hybrid, NK7633 (Sorghum Partners), was used in all field experiments. Not withstanding the lack of treatment difference, the grain sorghum yield gap from a common practice to kitchen sink was 12 bu/A. In Rossville, KS (under irrigation) grain sorghum yields ranged from 101 to 151 bushels/A and from 38 to 99 bushels/A in Ottawa, KS (dryland). Rainfall was limited in Ottawa during the flowering and reproductive stages of growth, which limited yield potential quite drastically. The USA is among the top-5 producers around the world, together with Nigeria, India, Ethiopia, and Argentina. More than 75 percent of the sorghum production, in the central and south-central region known as the “Great Plains,” is produced in the states of Kansas and Texas. Sorghum improvement in the last decades evolved at a lower rate as compared with corn. Thus, the influence of management practices (M component) on sorghum productivity need to be critically considered, but as a complex interaction between the genotype (G component) and environment (E component). A better understanding of sorghum response under diverse G x E x M scenarios would allow optimizing the use of all soil-plant resources, and then closing yield gaps by maximizing sorghum yield at each specific environment, soil by weather related. Kansas grain sorghum producers currently face low attainable yields (as related to the yield potential). This project takes into account several of the factors that farmers are faced with in making decisions about quantifying the diverse interactions that can maximize the yields. The trial was implemented at three locations: one at East Central Controlling Variables One Key to Closing Yield Gaps ▼ DOWNLOAD Kansas Experiment Field near Ottawa (KS), another at the Kansas River Valley Experiment Field near Rossville (KS), and another at the North Central Kansas Experiment Field near Scandia (KS). Objectives The objectives of the study were to: • Identify management factors that contribute to high yields under different environments • Examine dry mass and nutrient (N, P, and K) partitioning and movement between leaf and stem during the vegetative phase, and head, stem, and leaves during the reproductive