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Uptake of Potassium by Red Pine Seedlings and Losses Through Leaching from Fertilizers of Various Solubility¹

ABSTRACT

The uptake of K by red pine seedlings and the losses through leaching from irrigated, coarse-textured soil treated with fertilizers of different solubility were determined by plant tissue analyses and by the use of tension lysimeters. Potassium chloride, potassium-calcium metaphosphate and 20-mesh syenitic granite were used as sources of K. Considerable fractions of K were lost from applications of readily soluble KCl. The pattern of K leaching followed the rate of nitrification in the soil. Potassium metaphosphate possessed a greater stability and fertilizing value than KCl. The fraction of available K of the applied granite became exhausted during the second growing season.

¹ Contribution from the Soils Department, University of Wisconsin, Madison, in cooperation with Wisconsin Conservation Department. Publication approved by the Director of the Wisconsin Agr. Exp. Sta.

² Instructor in Soils and Professor of Soils, respectively. The authors are indebted to Mr. W. H. Brener, Superintendent of the Griffith State Forest Nursery, Wisconsin Rapids, Wis., for his cooperation in the different phases of this study.

Received for publication February 10, 1960. Accepted for publication May 4, 1960.