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Fluid Journal : Fluid Journal 1999-2001
Figure 1. Corn yields comparing in-furrow and over row starter placement and different NPK formulations, Manhattan, Kansas, 2000. Figure 2. Corn yield response to different N rates and the addition of sulfur (S) to NPK formulations, using 2 x 2 placement, Manhattan, Kansas, 2000. interest in applying all nutrients at planting in the Central Great Plains, points to the need for evaluation of techniques to avoid this germination effect and make it even more effective as a proven practice. With all these ideas in mind, research evaluating starter man- agement in conservation tillage production systems was continued in 2000 at our Manhattan and Scandia sites, applying high N rates in starters as well as differ- ent placements to reduce the risk of germination damage associated with higher N rates in starters. Manhattan Placement. The use of starter in either direct seed contact, dribbled over the row, or in a 2 x 2 placement increased yield (Figures 1 and 2). N rate. Increasing N rates in the starter above 10 lbs/A did not increase yields further, and final plant populations were signifi- cantly reduced at the 40- and 50- lb/A rates of N when placed in the furrow. Starter N rates up to 50 lbs/A of N placed over the row and120lbs/AofNplaced2x2 had no effect on plant popula- tions. These results suggest that when higher N rates in a starter are used, the starter should be placed over the row or 2 x 2. Sulfur added. In the 2 x 2 study, inclusion of 10 lbs/A of sulfur (S) in the starter increased yields by 13 bu/A (Figure 2). In 1999, the addition of S in the starter increased yields by 22 bu/ A. These results were somewhat unexpected as the soil is a pro- ductive silt loam with 3.1 percent organic matter. Apparently the cool, wet soil conditions encoun- tered with early planting and heavy residue cover slowed S release from organic matter mineralization early in the grow- ing season. Scandia Placement. When starter was applied in-furrow with the seed, plant populations were reduced by over 7,500 plants/A when com- pared with the other application methods. Corn yield averaged 34 bu/A lower when starter was applied in-furrow with the seed Fall 2001 Fluid Journal 2 YIELD - BU/A 97 105 113 121 129 137 145 153 30-30-10-0 30-30-10-10 60-30-10-0 90-30-10-0 120-30-10-0 N/P2O5/K2O/S - LBS/A NO STARTER YIELD - BU/A 100 105 110 115 120 125 130 135 140 10-15-5 20-15-5 40-15-5 50-15-5 N/P2O5/K2O - LBS/A IN-FURROW OVER ROW NO STARTER
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