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The Effect of Temperature and Moisture on Exchangeable Potassium
Author(s) -
Burns Allan F.,
Barber Stanley A.
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/sssaj1961.03615995002500050013x
Subject(s) - moisture , potassium , chemistry , soil water , water content , incubation , atmospheric temperature range , mineralogy , analytical chemistry (journal) , soil science , environmental chemistry , thermodynamics , geology , biochemistry , organic chemistry , geotechnical engineering , physics
The influence of temperature and moisture on the release of nonexchangeable K to the exchangeable form was studied in the laboratory. Varying moisture from 60 to 100% of moisture equivalent was found to have no effect on the release of nonexchangeable K at temperatures from 1° to 80° C. Temperature caused increases in the level of exchangeable K in all but one case. The higher the temperature, the greater was the rate of release of nonexchangeable K. The first release of K appeared to conform to a first‐order reaction, while subsequent release was of a zero‐order nature. Activation energies were determined from data obtained by the incubation of soils at three temperatures. These values were in the range of 11,000 to 26,000 cal. per mole. Data obtained by oven‐drying soils before and after incubation at 118° C. indicate that the increases in exchangeable K obtained by these two methods were due to different reactions.