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Fluid Journal : Fluid Journal 2005-2007
22 Fluid Journal WINTER 2007 Figure 2. Effect of topdressed chloride on leaf rust and yield in wheat, chloride rate at 40 lbs/A, Hill County, Texas; Miller, Texas A&M. Profit maker Wheat. An earlier Fluid Journal article by Lamond et al. (FJ, Fall 1999) discussed wheat responses to Cl. Recent data continue to substantiate the opportunities for increased yield and profit. For instance, Texas A&M data show how Cl fertilization relates to leaf rust intensity reduction as well as increased yields. Chloride fertilization of wheat has typically increased yields from 5 to 7 bu/A (Figure 2), which would increase net return around $9 to $16/A at today's prices. Occasionally, yield increases have been as high as 20+ bu/A, but some varieties have produced little response. Soil testing is the best means of estimating where this investment can pay off best. Spring topdressing has proven to be most effective for winter wheat in Kansas and Texas. The first ten years of Cl field research were focused on small grains, especially winter and spring wheat, while more recent studies have emphasized the profitability of Cl fertilization for both dryland grain sorghum and corn. Fewer studies have been conducted with irrigated crops because of appreciable quantities of Cl in irrigation water. For both of these row crops, soil test Cl has been the best predictor of Cl fertilization responses.Yield responses have frequently been larger than those recorded for wheat with correspondingly higher net returns per acre. Most of the studies have been conducted with broadcast 50 45 40 35 30 25 20 Yield bu/A 70 60 50 40 30 20 10 Leaf rust rating Check NH4Cl KCl MgCl2 bu/A Leaf rust rating Locations 1 2 3 4 5 per acre bu$bu$bu$bu$bu$ 20 19 58 2-11234 820716 40 164010191433 91640 KSU Soil test Cl: low-medium Corn: $3.50/bu Cl: $0.38/lb Table 2. Dryland corn yield and net return increases from chloride fertilization, Kansas. Locations 1 2 3 4 5 6 7 8 per acre bu$bu$bu$bu$bu$bu$bu$bu$ 20 816610143444102218469191640 40 122062 -3-25881323225011171735 KSU Soil test Cl: low Sorghum: $3/bu Cl: $0.38/lb Table 1. Dryland grain sorghum yield and net return increases from fertilization, Kansas. Cl rate lbs/A Cl rate lbs/A
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