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Fluid Journal : Fluid Journal 1993-1995
Winter 1995 140 130 120 110 100 90 80 70 0 50 75 100 N rate - lbs/A (at planting) Figure 3. Effect of quantity of N applied at planting and time of sidedressing (150 lbs/A total) on corn yield in split application programs, Eckert, Springfield, Ohio. Yield - bu/A 4-leaf stage 8-leaf stage program. Generally, 20 to 30 lbs/A of N in the row or 50 to 60 lbs/A of N broadcast is sufficient if the rest of the N is to be surface banded or injected at planting. There is little justifica- tion for using more N in the starter with such programs (Figure 3). Such rates are also usually appropriate in split application programs when the sidedress will be made at the 4-leaf growth stage or earlier. If later sidedressing is anticipated, increasing the amount of N applied near planting time may increase yield. Optimum rate If proper management practices are used, the quantity of N needed by corn grown under conservation tillage is usually no different from the rate needed by corn grown under conventional tillage in the same field. Optimum rate will be influenced more by soil type, previous crop, and yield potential than by tillage system. Producers should follow local recommendations in selecting rates and then apply those rates properly. If such steps are taken, corn yields will not be limited because of less than adequate N management. Dr. Eckert is professor in the School of Natural Resources at Ohio State University. !
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