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Soil Science Society of America Journal Abstract -

Release of Nonexchangeable Soil Potassium During Short Periods of Cropping and Sodium Tetraphenylboron Extraction1


This article in SSSAJ

  1. Vol. 25 No. 2, p. 128-132
    Received: June 24, 1960
    Accepted: Aug 8, 1960

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  1. A. D. Scott and
  2. L. F. Welch2



Undried soils were cropped in the greenhouse to determine the short-term release of nonexchangeable K under intensive cropping conditions. Using corn root mats with plants intact, it was found that 218, 59, 50 and −1 ppm. nonexchangeable K was released in 10 days by Marshall surface and subsoil and Clarion surface and subsoil samples, respectively, that had received no NH4 or K additions. It was concluded that this short-term cropping method could be used to study factors that affect the availability of nonexchangeable soil K to plants.

Nonexchangeable K was also extracted from the undried soils by two chemical methods that tend to reduce the blocking effect of replaced K. Single extractions with a NaOAc-NaBPh4 solution removed more nonexchangeable K than five successive NaCl-HCl extractions or 5-day cropping periods. The corn plants and the NaCl-HCl solution, however, continued to remove K when the extraction period was increased whereas the NaOAc-NaBPh4 solution did not.

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