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Fluid Journal : Winter 2014
Dr. Wiatrak is Assistant Professor/ Agronomist in the Department of Entomology, Soils, and Plant Sciences at Clemson University in Blackville, South Carolina. Fig. 2 . Influence of predicted sidedress N rates using Clemson algorithm for each zone and across zones in comparison to a fixed rate of 120 lb N/acre on corn grain yields in soil zone 2. Letters indicate significant difference at p≤0.05. Fig. 3 . Influence of algorithm predicted sidedress N rates for each zone and across zones in comparison to a fixed rate of 120 lb N/acre on corn grain yields in soil zone 3. Letters indicate significant difference at p≤0.05. Summing up Grain yields were significantly higher for soil zones 2 and 3 than zone 1, higher from split than all-at- planting, and higher from the highest rate of 160 lbs/A of N compared to other N treatments of corn (Figures 1, 2 and 3). Higher grain yields were mostly due to: • Greater plant NDVI • N content in corn leaves • Test and grain weight • Grain N content. The soil nitrate-N concentration was higher from zones 2 and 3 due to higher holding capacity of these zones compared to zone 1, and higher with high N rates at 18-24, 24-30, and 30-36 inch soil depths, indicating N movement into lower soil profiles with high N rates. The predicted rate of 90 lbs/A of N using Clemson algorithm and NDVI readings did not significantly decrease grain yields compared to the fixed sidedress N rate of 120 lbs/A of N. Therefore, sidedress N rates could be decreased by 30 lbs/A of N without significant yield reduction for soil zones 1, 2, and 3, indicating that Clemson algorithm could be efficiently used in predicting sidedress N rates and improving NUE and profitability of corn production. ACT NOW! JOIN IN THE SUPPORT OF THIS ORGANIZATION THAT DIRECTLY BENEFITS YOUR BUSINESS! The Fluid Fertilizer Foundation • 2805 Claflin Road, Suite 200, Manhattan, KS 66502 Write, call or e-mail the Fluid Fertilizer Foundation Phone: 785-776-0273 E-mail: firstname.lastname@example.org Research and education for efficient use of fluids. The Fluid Fertilizer Foundation We need you to join hundreds of other growers, dealers, fertilizer manufacturers and other supporting industries