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Fluid Journal : Fluid Journal 1996-1998
3 Fluid Journal Summer 1996 Soil at the site was Crete silt loam. Analysis by the KSU Soil Test Lab showed that initial soil pH (April 1993) was 6.1. Organic matter was 2.4 percent, Bray-1 phosphate 43 ppm, and exchangeable potassium 380 ppm in the surface 6 inches. Plot design was split with hybrids as the main plots. Hybrids were ICI 8599 (2530 GDU), Pioneer 3563 (2600 GDU), Pioneer 3346 (2850 GDU), Dekalb 636 (2830 GDU), Dekalb 591 (2590 GDU), and Pioneer 3394 (2690 GDU). Fertilizer. Starter was applied two inches to the side and two inches below the seed at planting at the rate of 30 lbs/ A of nitrogen and 30 lbs/A of P205. Starter sources were 10-34-0 and 28-0-0 UAN. Planting. Corn was planted on April 26, 1993 and April 19, 1994. Seed rate per acre was 24,000 into crop residue without tillage. Variance confirmed On cool no-till soils testing high in P, starter fertilizer improved early season growth and nutrient uptake in all hybrids tested. Only for some hybrids did this response translate into an increased grain yield. Thus, these tests confirm that hybrids do respond to starter fertilizer differently. Dr. Gordon is associate professor Dr. Fjell is professor, and Dr. Whitney is professor, Department of Agronomy, Kansas State University, Manhattan, KS.
Fluid Journal 1993-1995
Fluid Journal 1999-2001