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Water-soluble, exchangeable and nonexchangeable potassium in six soil series from tropical India

Published online by Cambridge University Press:  27 March 2009

A. Subba Rao  and
G. S. Sekhon
A. Subba Rao
Affiliation:
Potash Research Institute of India, Sector 19, Gurgaon, Haryana 122001, India
G. S. Sekhon
Affiliation:
Potash Research Institute of India, Sector 19, Gurgaon, Haryana 122001, India
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Summary

Six soil series differed in water-soluble, exchangeable and nonexchangeable K. Significant positive relationships were observed between exchangeable K and water-soluble K. A highly significant positive relationship was found between the K saturation of the cation exchange complex and water-soluble K in the individual soil series, and when the six series were pooled; K saturation, therefore, may predict water-soluble K in a range of tropical soils. Potassium desorbed in 35 min by electroultrafiltration (EUF) may serve as a measure of exchangeable K in predominantly kaolinitic tropical soils. In soils with appreciable amounts of mica, longer K extraction by EUF (up to 70 min) may indicate the reserves of nonexchangeable K.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 114 , Issue 2 , April 1990 , pp. 127 - 131
Copyright
Copyright © Cambridge University Press 1990

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References

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