Toxic Factors in Acid Soils: I. Characterization of Aluminum Toxicity in Cotton
1963
Foy, C. D. | Brown, J. C.
Aluminum toxicity is one of the limiting factors in acid soils. Increased yields of cotton and uptake of P were obtained by liming a Bladen soil. The same results were obtained in Al-containing nutrient solutions by increasing the pH of the solution or by adding increasing amounts of P. In each case, Al was precipitated and cotton absorbed more P, Ca, and K concomitant with increased yields. A P/Al ratio > 2 was required in solution before root branching and top growth of cotton occurred. Less added P was required for growth where Al was added at pH 5.0 than at pH 4.0. The most characteristic symptom of Al toxicity in cotton is P deficiency. An accumulation of Al compounds in or on the root is believed to be detrimental to both chemical and physical absorption processes by the cotton plant.
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