Premium
Release of Nonexchangeable Soil Potassium During Short Periods of Cropping and Sodium Tetraphenylboron Extraction
Author(s) -
Scott A. D.,
Welch L. F.
Publication year - 1961
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1961.03615995002500020018x
Subject(s) - subsoil , extraction (chemistry) , chemistry , potassium , soil water , sodium , agronomy , chromatography , environmental science , soil science , organic chemistry , biology
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 NH 4 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‐NaBPh 4 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‐NaBPh 4 solution did not.