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Effect of Long Term Potassium Rate and Placement on Cotton

Gordon R. Tupper, H. C. Pringle, III and M. Wayne Ebelhar


This paper presents the second four years of an eight-year study on the effect of potassium rates and placement systems on lint yield with four cotton varieties. The study was conducted on a Beulah and Bosket very fine sandy loam potassium deficient soil with 5.9 pH values or higher. Three potassium fertilizer rates (80, 120, and 160 lb K2O/A) in their 5th, 6th, 7th, and 8th years of application and three placement systems (surface broadcast, deep banded, and split – 50% surface broadcast and 50% deep banded) were applied to four cotton varieties (‘DES 119', ‘DP 5415', ‘LA 887', and ‘SG 501') to study the effect on lint yield. Results were variable for potassium treatment and varieties over years. However, potassium applications significantly increased lint yield. The most consistent yield increases came from deep banding potassium in the drill from 6 to 15 inches deep. The most consistent rate for deep banding was 120 lb K2O/A. The surface broadcast method was the least consistent method for increasing lint yields. The no potassium (check) treatment produced the lowest lint yield in 15 of 16 possibilities. The Stoneville deep banding dry materials applicator was very effective in deep banding potassium fertilizer and can be used to correct low potassium subsoils and increase lint yields.

Reprinted from Proceedings of the 1998 Beltwide Cotton Conferences pp. 618 - 621
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998