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Synopsis: Potassium applications increased yield of seed cotton, size of bolls, and fiber micronaire values, but decreased lint percentage. K content of plants increased in proportion to .rate of K applied. Old leaves plus petioles gave the best indication of the K status of the plant. Fiber quality was best at lower rates of K.
2 Research Soil Scientists, Agricultural Research Service, USDA, Thorsby, Alabama.
Received for publication November 5, 1964.
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