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Fluid Journal : Fluid Journal 2008-2009
DR. GYLES RANDALL AND JEFF VETSCH NPKS Starters Improve Profitability On High-Testing Soils Historically, starter fertilizers have not been commonly recommended for corn production on high or very high P-testing soils due to poor yield response even though early growth responses may be seen. However, we've seen renewed interest in starter (band-placed) fertilizers as 1) corn yields continue to increase, 2) tillage intensity tends to decrease, and 3) corn planting comes earlier. With this renewed interest, questions have been raised regarding the inclusion of K and S in the fluid Studies conducted at Southern Research and Outreach Center in Waseca, Minnesota. starter, as well as about optimum placement (in-row with seed vs. bands 2 inches from the seed or bands dribbled on the soil surface). Objectives of the research in this report were: • Determine the effect of various combinations and rates of N, P, K and S as starter fertilizers for improving corn production and profitability on high P- and K-testing soils • Evaluate starter placement positions for NPKS fluid fertilizers for corn grown on high P- and K-testing soils • Provide to corn producers, crop advisors, and the fertilizer industry management guidelines on fluid starter fertilizer rates and placements for corn grown on high P- and K- testing soils with reduced tillage. Concentration Concentrations of N, P, K, and S in the whole small plant at the V6 stage were inconsistently affected by NPKS treatments (Table 1). This was particularly true for N and P where statistically significant differences were found but there was no clear effect of rate or placement and no interaction between rate and placement. Whole-plant K concentrations were not affected by starter P and K treatments. Whole- plant S concentration was increased bythe2x2and2x0treatmentsthat received S. Concentrations of NPKS weresimilarbetween2x0and2x2 placement. Dry matter Dry matter accumulation at V6 was affected by the starter P
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