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Fluid Journal : Fluid Journal 2002-2004
Six-leaf K content. The 30-30-5 starter treatment increased corn 6-leaf stage tissue K content by 4 lbs/A compared to the 30-30-0 treatment (Figure 1). Yield. The 30-30-5 starter treatment increased corn grain yield by 12 bu/A compared to the 30-30-0 treatment (Figure 1). Response time. The 30-30-5 starter treatment decreased the number of days from emergence to mid-silk compared to the 30-30-0 treatment. In all cases, the 30-30-5 starter treatment was also superior to the 15- 30-5 treatment, indicating that N is an important element of starter fertilizer composition. All starter treatments improved early-season growth, nutrient content, and yield over the no starter check (Figure 1). Conclusion The results of this study indicate that K deficiencies can occur even though soil test levels are not low. A small amount of K included in a starter can correct the deficiency and improve corn grain yields. Methodology Site. This irrigated ridge-till experiment was conducted at the North Central Kansas Experiment Field. Soil is a Crete silt loam. Soil test showed that initial pH was 6.2. Organic matter was 2.4 percent. 2 Fluid Journal Late Spring 2003 Bray-1 P and exchangeable K in the top 6 inches of soil were 40 and 420 ppm, respectively. Starters were made using 28% UAN, ammonium polyphosphate (10- 34-0) and potassium thiosulfate (0-0- 25-17). N was balanced so that all plots received 220 lbs/A regardless of starter treatment. On plots receiving no K as KTS, ammonium sulfate was included in the balancing N application. Application. Starter fertilizer was applied 2 inches to the side and 2 inches below the seed at planting. Dr. Gordon is professor in the Department of Agronomy at KSU.
Fluid Journal 1999-2001
Fluid Journal 2005-2007