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Fluid Journal : Fluid Journal 1993-1995
2 Fluid Journal Spring 1995 0 60 0 30 60 90 PO -lbs/A 25 Phosphate rate applied with corn 1 P at Planting Residual P1 Yields - bu/A 52 51 50 49 48 47 46 45 44 110 105 100 95 90 85 Yields - bu/A 0 30 60 90 PO -lbs/A 25 Figure 1. Effect of P on grain yield of early-matuing corn, Rossville, Ashraf et al., 1994. Fugure 2. Effect of P and residual P on grain yield of winter wheat, Rossville, Ashraf et al., 1994. are unwilling or unable to apply fertilizer when planting wheat, the research reported here shows that P applied at corn planting can benefit the subsequent crop. The expected mid- September harvesting time for early- maturing corn should leave plenty of time for wheat planting. Rossville. When phosphate was applied at 60 lbs/A at wheat planting, wheat grain yield was 8 percent higher than areas where no P was applied (Figure 2). Test weight was 1 percent higher. Grain yields were also signifi-cantly higher where there was residual P. Interaction between P applied at wheat planting and residual P was significant for above-ground dry matter (boot stage) yield and wheat grain moisture. Without P applied at wheat plant-ing, above-ground dry matter yield increased as residual P increased. This effect was not present when P was applied at wheat planting. Similarly, there was a residual P effect in grain moisture when no P was applied at planting and no effect when P was used. Norway. Wheat grain yield was 9 percent greater with P at wheat planting than in residual P areas; similarly, above-ground dry matter was 19 percent greater. Effects of residual P rate on grain yield, grain moisture, and test weight were variable. Dr. Ashraf is a graduate, Dr. Pierzynski is associate professor, Dr. Gordon is assistant professor; and Dr. Lamond is professor in the Department of Agronomy at Kansas State University.
Fluid Journal 1996-1998