INFLUENCE OF SODIUM ON YIELD AND QUALITY OF COTTON LINT AND SEED

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Abstract
In field experiments, Na from NaNO3 or NaCl increased the yield of seed cotton (and the size of bolls) only on soils that were deficient in K, and the largest increase was obtained on the most K-deficient soil where Na was added without K, but with the addition of sufficient K, no response to Na occurred. There was little evidence that Na improved the quality of cotton lint and seed even in the presence of severe K deficiency, the only noticeable exception being an increase in percentage germination. It was concluded that the principal value of Na in the production of cotton is as a partial substitute for K thereby reducing the K requirement for opt. yields. At least 75% of the soils of Mississippi that are deficient in K for the production of cotton do not contain sufficient exchangeable Na to permit max. substitution of Na for K.

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