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Interpretive Summaries:
2006 - Cotton and Soil Response to Application of Potassium
2005 - Cotton Response to Combinations of Nitrogen and Potassium
Cotton and Soil Response to Application of Potassium, 2006
This field study evaluated the effect of cotton cultivar (short and long-season) and K fertilization on seedcotton yield, petiole K concentration, and Mehlich-3 extractable K. The experimental design was a randomized complete block with a split-plot treatment where cotton cultivar (Stoneville 5599 and DeltaPineland 445) was the main-plot factor and K rate (0, 30, 60, 90, 120, and 150 lb K2O/A) was the subplot factor.
Cotton cultivar or cultivar x K rate did not have any significant effect on seedcotton yield, petiole K concentration, or post harvest soil test K within the 0 to 6-in. depth. Averaged across both cultivars, seedcotton yield ranged from 2,347 to 3,261 lb/A and was significantly (p = 0.04) increased as K application rate increased. Numerically, the highest yield was produced with application of 150 lb K2O/A. Seedcotton yield of all treatments that received > or equal to 90 lb K2O/A (2,965 to 3,261 lb/A) was significantly higher that the zero K check (2,347 lb/A). Averaged across both cultivars, petiole K increased with increasing rate of K application and tended to decrease as the cotton plant developed. Potassium application rate significantly (p = 0.0003) and linearly increased Mehlich-3 extractable K within the 0 to 6-in. depth. Mehlich-3 extractable K in the control and plots that received 150 lb K2O/A were 66 and 97 ppm, respectively. The data indicate that K fertilizer application was needed to increase seedcotton yield and petiole K levels and to improve soil K availability. AR-29F
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