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Starter Fertilizer and the Method and Rate of Potassium Fertilizer Effects on Cotton Grown on Soils with and Without Winter Grazing by Cattle

Bill H. Bryce, G.L. Mullins, C.H. Burmester


 
ABSTRACT

A three year field study was conducted on a Decatur silt loam (Rhodic Paleudult) in north Alabama. The objective of the study was to evaluate the effects of winter grazing on the K and starter fertilizer needs of cotton (Gossypium hirsutum L.). Grazed and non-grazed treatments were established by planting a wheat (Triticum spp.) cover crop in the fall and allowing cattle to graze for 35 to 65 days prior to planting using a strip-tillage system. After grazing, fertility treatments were established in the killed wheat. Fertility treatments consisted of 3 rates of K (0, 40, and 80 K2O/acre), 3 methods of K application: 1) surface broadcast, 2) in-row, band application at a depth of 12 inches, and 3) surface band application using a spacing of 20 inches and two rates of starter fertilizer: 1) no starter, and 2) 150 lb/acre of a liquid 15-15-0. Seed cotton yields were affected by grazing of the winter cover crop prior to planting but not by the method of K fertilizer application. Starter fertilizer consistently gave slightly higher yields with a significant response occurring in two out of three years.



Reprinted from Proceedings of the 1996 Beltwide Cotton Conferences pp. 1426 - 1428
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998