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Fluid Journal : Fluid Journal 1996-1998
3 Fluid Journal Summer 1997 composition of the tissue but had no effect on K composition. The highest rate of K application in starters also had the greatest depressing effect on Mg in the tissue, similar to that observed at Dixon Springs. At Dixon Springs, the lowest ear leaf K was found in the treatment receiving N plus P but no K (30-30-0-0). In all treatments, ear leaf K composition was well above the critical levels of 1.75 percent needed for optimum corn production. Ear leaf Ca and Mg were highest in the 30-30-0-0 treatment where the lowest K composition was observed. This response was probably a result of the antagonism of higher levels of K in the soil solution reducing the uptake of Ca and Mg. Procedure Fertilizers. Starter treatments included a fixed application of N (30 lbs/A) with variable amounts of phosphorus, potassium, and chloride added as companion nutrients. Source for the nitrogen component in the starter was 28-0-0. For phosphorus (and part of the N) it was 10-34-0. For potassium it was 0-0-62. For chloride it was either 0-0-62, or it was added as calcium chloride. Each starter treatment was duplicated: one without N-Serve and the other with N-Serve added. Application. Starters were applied in a band 2 inches to the side and 2 inches below the seed at planting (controls were included). At planting, 30 lbs/A of N (28-0-0) was sprayed as a "weed and feed" to the controls to balance the N applied in the starter treatments. An additional 150 lbs/A of N was applied as a knife-injected UAN at sidedressing to give a total of 180 lbs/A of N applied to the crop. Tillage. Starter treatments were evaluated under both no-till and reduced (chisel) tillage systems at each location. At Belleville in 1996, however, treatment effects were evaluated using only chisel tillage because the final stand of corn under no-till was too uneven to be satisfactory for a valid yield comparison. Plot design. A split plot design was used at both locations, with tillage as main plots and starter treatments (with and without N-Serve) as subplots. At Belleville, however, no main plot comparisons or interactions of tillage with fertilizers were possible. Four replications of all treatments were employed at each location. Soil. Soil at the Dixon Springs Agricultural Center site of the University of Illinois is classified as a Fluvaquent (bottomland soil). Soil at the Belleville Research Center site of Southern Illinois University is classified as an Alfisol that has a moderately well developed soil profile (a weak claypan). Organic matter content in both soils ranges from 1.5 to 2.0 percent. Dr. Varsa is associate professor Department of Plant, Soil and General Agriculture, Southern Illinois University; and Dr. Ebelhar is agronomist, Dixon Springs Agricultural Center University of Illinois.
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