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A Beltwide Evaluation of Potassium Rate and Applications Method on Cotton Yield and Quality
The increased yield potential of new varieties, better management by growers, and eradication of the boll weevil have pushed cotton yields to 3+ bales/acre on a regular basis. Such high yields put a substantial demand on the cotton root system’s ability to take-up sufficient potassium (K) and other nutrients. The objectives of the trials are: 1. Determine the soil potassium levels in the surface horizon and at depth in several cotton production regions experience K deficiency symptoms; 2. Evaluation the application methods and rates of K on cotton yield, quality, and return on investment. Trials were conducted at 8 locations across the Cotton Belt, from the Southwest to the East Coast. Soil samples were collected to a minimum of a two feet depth at each site. Potassium was applied via broadcast incorporated (0-0-60) or injected (0-0-15) at six inches depth at rates of 0, 40, 80, 120, and 160 lb K2O/a. DP 1522 B2XF was planted at each location. Leaf samples were collected at FB+2 weeks and analyzed for K levels. Late-season plant ratings and disease incidence data were collected. Plots were harvested, ginned, and fiber sample analyses conducted at Cotton Incorporated. A summary of these results will be presented.