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Evaluation of some chemical extractants for predicting response of wheat grown in pots to copper in Sub-Himalayan soils

Published online by Cambridge University Press:  27 March 2009

R. Sakal ,
A. P. Singh ,
B. P. Singh  and
R. B. Sinha
R. Sakal
Affiliation:
Department of Soil Science and Agricultural Chemistry, Rajendra Agricultural University, Pusa, Samastipur, Bihar, India
A. P. Singh
Affiliation:
Department of Soil Science and Agricultural Chemistry, Rajendra Agricultural University, Pusa, Samastipur, Bihar, India
B. P. Singh
Affiliation:
Department of Soil Science and Agricultural Chemistry, Rajendra Agricultural University, Pusa, Samastipur, Bihar, India
R. B. Sinha
Affiliation:
Department of Soil Science and Agricultural Chemistry, Rajendra Agricultural University, Pusa, Samastipur, Bihar, India
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Summary

Seven out of ten chemical extractants were found to be promising for the evaluation of critical limit and response of wheat grown in pots to Cu application in Sub-Himalayan hill and forest soils of recent alluvium origin. The critical limit of available Cu using DTPA-CaCl2(pH 7·3), DTPA-NH4HCO3 (pH 7·6), EDTA-(NH4)2CO3 of pH 8·6, EDTANH4OAc (pH 7·0), n-NH4OAC (pH 7·0), n-NH4OAC (pH 4·8) and n-Mg(NO3)2 of pH 5·9, was 0·66, 1·73, 1·95, 1·38, 0·13, 0·20 and 0·47 mg Cu/kg, respectively. The amount of Cu extracted by these extractants was positively and significantly correlated with ‘Bray's percent yield’. Apart from ‘Bray's per cent yield’, the Cu extracted by most of these extractants was positively and significantly correlated with Cu concentration in the third leaf of wheat, Cu uptake by wheat shoots and organic carbon content of the soils, and negatively correlated with soil pH but the value of this relationship did not approach the 5% level of significance. n-Mg(NO3)2 of pH6·7, N-NH4NO3 and 0·1 n-HCl were found to be ineffective extractants. Among chelating agents, DTPA-CaCl2 was found to be most and EDTA-NH4OAc least promising extractant. N-NH4OAC (pH 4·8) proved to be better than N-NH4OAC (pH 7·0). The critical Cu concentration in the third leaf of wheat was 8·8 mg Cu/kg, below which responses in dry weight to Cu application may be expected.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 102 , Issue 3 , June 1984 , pp. 659 - 666
Copyright
Copyright © Cambridge University Press 1984

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