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Determination of Available Potassium in Soils of Forest Plantations¹

ABSTRACT

Various soil biological and chemical tests were compared in respect to their suitability for predicting deficiency of potassium for red pine grown on soils of Wisconsin and New York. The biological tests were accomplished by the Azotobacter and Aspergillus niger methods. The chemical tests included extraction of soil by N NH₄OAc of pH 6.9 and 4.6, extraction by N NH₄NO₃ of pH 6.9 and 4.0, extraction by 0.4 N HCl, ignition of ammonium-saturated soil followed by extraction with neutral N NH₄OAc, and extraction with boiling N HNO₃. The last method provided the sharpest distinction between potassium-deficient and nondeficient forest soils as detected by the rate of growth and response of plantations to application of potash fertilizers.

¹ Contribution of the State University College of Forestry at Syracuse Univ., Syracuse, New York. Presented before Div. V-A, Soil Science Society of America, Atlanta, Ga., Nov. 20, 1957.

² Instructor in Silviculture. Work conducted while author was Research Assistant in Soils, Univ. of Wisconsin, Sincere appreciation is expressed to Dr. S. A. Wilde and Dr. R. B. Corey for suggestions and guidance, and Dr. D. P. White and Dr. E. L. Stone, Jr., for furnishing the New York soil samples.

Received for publication December 27, 1957. Accepted for publication April 14, 1958.

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