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Fluid Journal : Fluid Journal 1996-1998
Fall 1997 introducing K, S, and Zn into the mix did not significantly affect grain yield, when compared with N and P alone. Conclusion Results of this work suggest that responses to starter fertilizer can be economical for some hybrids, even on soils that are not low in available nutrients, particularly when corn or grain sorghum is planted in a high-residue production system. Procedure Sites. For corn, location was a farmer's furrow-irrigated field in the Republican River Valley near Scandia, Kansas, that had been in ridge-till four years prior to study. For grain sorghum, it was the North Central Kansas Experiment Field near Belleville. This site had been in no-till production three years prior to our experiment. Soil on farm near Scandia was a Carr sandy loam with a pH of 7.2, organic matter content of 1.0 percent, Bray-1 P of 21 ppm, and exchangeable K of 280 ppm in the surface 6 inches. At Belleville, soil was Crete silt loam with a pH of 6.5, organic matter content of 2.5 percent, Bray-1 P of 44 ppm, and exchangeable K of 350 ppm in the top 6 inches. Placement. Starter was applied two inches to the side and two inches below the seed at planting. Planting. Corn was planted April 23 at 30,000 seeds/A. Grain sorghum was planted on May 24 at 64,000 seeds/A. Immediately following planting, N was balanced on all plots to give a total of 200 lbs/A in the corn study and 150 lbs/A in the grain sorghum study. Fertilizer. N source was 28% UAN, P source was 10-34-0, K source was KCL, S source was ammonium thiosulfate, and Zn source was a liquid Zn-NH3 complex. _________________________________ Drs. Gordon and Pierzynski are associate professors, Department of Agronomy, Kansas State University. ! Dry weight -- lbs/A 900 800 700 600 500 400 1 2 3 4 5 6 Pioneer 8699 Northrup King KS-735 Dekalb 40Y Dekalb 48 1. Check 2. 30-30-0-0-0 3. 30-30-20-0-0 4. 30-30-0-10-0 5. 30-30-0-0-1 6. 30-30-20-10-1 (N-P2O5-K2O-S-Zn) Figure 3. Starter combination effects on V-6 stage whole plant dry weight of grain sorghum hybrids, Gordon and Pierzynski, Belleville, KS, 1996. Yield -- bu/A 175 150 125 100 75 50 123456 123456 Pioneer 8699 Northrup King KS-735 Dekalb 40Y Dekalb 48 1. Check 2. 30-30-0-0-0 3. 30-30-20-0-0 4. 30-30-0-10-0 5. 30-30-0-0-1 6. 30-30-20-10-1 (N-P2O5-K2O-S-Zn) Figure 4. Starter combination effects on yield of grain sorghum hybrids, Gordon and Pierzynski, Belleville, KS, 1996. 123456 123456
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