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Fluid Journal : Fluid Journal 2002-2004
the N applied as fluid N and 0.3 percent of the total N applied during the year. Such results suggest that fluid fertilizers, which are rapidly absorbed in the soil, have less tendency to run off when heavy rainfall or irrigation occurs shortly after application In such a condition, undissolved granules can be swept downhill with moving water. This is especially true when wheel tracks are made in the direction of the slope. METHODOLOGY Soil. Study was conducted for two years on a Tifton loamy sand with a slope of 4.5 percent on meso-scale (0.15-acre) plots. Irrigation. We simulated rain at one inch/hr for two hours, eight days prior and 1, 14, 29, 49, and 108 days following fertilization and planting of corn. Fertilizer/placement. The day of planting, experimental sites received 45 lbs/A of N, 50 lbs/A of P, and 112 lbs/A of K as granulated fertilizer broadcast and incorporated to a depth of 6 inches. The N and P were applied as granular di-ammonium phosphate (18-46-0). An additional 105 lbs/A of N was surface dribbled as 30-0-0 UAN 28 days following planting. Dr. Gascho and Dr. Hook are in the Crop and Soil Sciences Department at the University of Georgia, Dr. Wauchope is at the Southeast Watershed Unit in Tifton, Georgia, and Dr. Davis is in the Crop and Soil Sciences Department at Colorado State University. 2 Fluid Journal Fall 2003
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