Utilization of potassium buffering capacity to predict cotton yield response to potassium fertilizer: 1992-1994
1996
Davis, J.G. | Abaye, O. | Baker, W. | Bauer, P. | Boman, R. | Cothren, T. | Fowler, J. | Funderburg, E. | Gass, W. | Hickey, M.
A study was conducted to (1) develop a method to predict cotton response to K fertilizer application across the U.S. Cotton Belt using the K buffering capacity (KBC), (2) determine the relationship of commonly measured soil physical and chemical properties to KBC for a number of diverse cotton-producing soils, and (3) compare soil extractants and K fertilizer recommendations used across the Cotton Belt. Locations were chosen to represent the major soil types across the Cotton Belt. All of the experimental sites which had yield responses to K fertilizer were in mineralogical classes with moderate to high amounts of kaolinite. When K fixation was <100% there was a 44% probability of yield response to K across all experimental sites. When K fixation was between 100 and 110%, probability of yield response was 23%; and above 110%, probability of yield response was 0%. Potassium fixation was positively correlated with CEC, and was more highly correlated with Mehlich-3 and ammonium acetate extractable K than with Mehlich-1 extractable K. It is concluded that the use of K fixation percentage as a predictor of cotton yield response to K fertilizers shows promise across the Cotton Belt.
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