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Abstract

 

This article in SSSAJ

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


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doi:10.2136/sssaj1961.03615995002500020018x

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

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

Abstract

Abstract

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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