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Effects of Plant Nutrition on Black Root

Gary Gascho and Benjamin Baldree


ABSTRACT

Cotton in the poorly drained Atlantic Coastal Plain Flatwoods and in other poorly drained soils in Georgia is susceptible to black root (an abiotic disease, associated with soils containing high concentrations of Cl). Affected cotton has black roots, mottled leaves, and flowers with a protruding stigma that retains little pollen. When the disease is severe, little or no lint yield is obtained. Applications of broiler litter were effective in correction of the malady. Research at five field sites in 2001 indicated responses averaging 507 and 678 pounds of lint/acre for applications of 2 and 4 tons of litter/acre, respectively. Residual broiler litter from an application made to the previous crop also appeared to be effective. Neither high rates of N, P, K, nor applications of Cu, Zn, B, or Mo were effective.





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Document last modified May 20, 2002