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Evaluation of soil tests for the estimation of available sulphur

Published online by Cambridge University Press:  27 March 2009

B. R. Arora
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana, India
G. S. Sekhon
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana, India

Summary

In a glasshouse experiment, sulphur was applied to 22 soils as 35S-labelled gypsum. Estimates of available sulphur using different extractants were correlated with yield responses and sulphur uptakes by oats. The largest correlation coefficients were obtained with ‘A’ values and sulphur soluble in 0·5 M-NaHC03, 1% NaCl after heating and ammonium acetate–acetic acid. Critical levels of available sulphur obtained by relating these four methods to yield responses were 24·0, 22·0, 11·0 and 10·5 mgS/kg soil respectively.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1977

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