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Extraction of Potassium from Soils with Sodium Tetraphenylboron¹

ABSTRACT

The amounts of K extracted from several soils of different K supplying power with solutions containing NaTPB were compared with the amounts taken up by intensive greenhouse cropping and with the amounts extracted with 1N NH₄OAc (exchangeable K). The best estimate of plant available K was the amount of K extracted from 2-g samples of nondried soil with 10 ml of 0.3N NaTPB in 15 min (r = 0.991). The decrease in the amount of K extracted by the same reagent in 16 hours, as a result of cropping, likewise was closely correlated with available K (r = 0.984). Exchangeable K determined in nondried soil samples was more closely correlated with available K (r = 0.971) than was exchangeable K determined in dried soil samples (r = 0.788).

¹ Contribution from the Soils Department, University of Wisconsin, Madison. Published with the permission of the Director, Wisconsin Agr. Exp. Sta. Supported in part by the Research Committee of the Graduate School with funds from the Wisconsin Alumni Research Foundation.

² Instructor and Associate Professor, respectively, University of Wisconsin, Madison.

Received for publication July 17, 1964. Accepted for publication October 6, 1964.