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The Potassium Status of Hartsells Fine Sandy Loam as Affected by Potassium Fertilization¹

ABSTRACT

The K status of Hartsells fine sandy loam was characterized in the field by cropping for 18 years at rates of K ranging from 0 to 80 pounds per acre followed by 9 years of cropping without further additions. The K supplying power, exchangeable K, K content of cotton leaves, and cotton yield were determined annually during the residual period. These data indicate that the easily replaceable nonexchangeable K and the exchangeable K are both of value in sustained crop production.

The rate of K application found to be adequate during the rate's study was inadequate when applied to former check plots until the application had been repeated annually for 5 or 6 years. It was found feasible to bring plots to a desired level of exchangeable K by discreet additions.

¹ Contribution from the Department of Agronomy and Soils, Agr. Exp. Sta. of the Alabama Polytechnic Inst., Auburn. Published with the approval of the Director. Presented before Div. IV, Soil Science Society of America, Nov. 21, 1957, at Atlanta, Ga.

² Soil Chemist.

Received for publication January 10, 1958. Accepted for publication March 24, 1958.