D.J. Boquet, LSU AgCenter, Macon Ridge Research Station, 212 Macon Ridge Road, Winnsboro, LA 71295, Gary A. Breitenbeck, Louisiana State University, M.B. Sturgis Hall, Dep. of Agronmy and Environmental Management, Baton Rouge, LA 70803, and John S. Kruse, Georgia-Pacific Chemicals, LLC, 2883 Miller Road, Decatur, GA 30035.
Three formulations of N fertilizer, urea, ammonium nitrate and Nitamin® 43G were soil-applied and foliar-applied to cotton in single and split applications. Soil-applied rates were 0, 25, 50, 75, 100 and 125 pounds per acre. Foliar-application rates were 10, 20 and 30 pounds per acre in sequential applications. Cotton yields were increased by soil application of N rates up to 75 pounds per acre. Urea, ammonium nitrate and Nitamin® 43G were equally effective for yield. Split applications were not more effective for yield than a single at-planting application. Foliar application of N did not increase cotton yield.
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