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Published in Soil Sci Soc Am J 44:29-33 (1980)
© 1980 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Characterization of the Zinc Retained in Some Soils of India Using pH Gradient Elution1

U. C. Shukla and S. B. Mittal2

ABSTRACT

Zinc retained in soils was characterized by studying its solubility characteristics in continuous elution with a pH gradient solution and equilibrium extraction in 1N NH4OAc (pH 7.0), 1N HCl and 6N HCl, and relating these to the solubility characteristics of Zn(OH)2 and Zn3(PO4)2 added to the soil. Zinc was retained in forms having low solubility throughout the pH range of 6.8 to 3.2. Solubility increased 5 to 15 times below pH 3.3. Equilibrium extraction of Zn by different reagents also showed that a large portion of the retained Zn was in slowly available forms. More Zn remained extractable in sand than loam at pH values > 4.0, however, more soil Zn was extracted in loam than sand at pH < 4.0. Solubility curves of Zn(OH)2 and Zn(PO4)2 resembled the solubility curves of adsorbed Zn. The relationship as described by Lindsay and Norvell (4), [Zn2+] {cong} 105 (H+)2, did not seem to fit these soils. In this investigation the observed relationship was [Zn2+] {cong} 104(H)0.1. There was less change in Zn concentration with changes in pH between 6.8 and 4.0. Precipitation reactions, i.e. formation of Zn(OH)2 and Zn3(PO4)2, etc. in these soils of pH 8.3 and 8.4 predominated, particularly at high equilibrium Zn concentrations. Proportionally more Zn remained extractable at low than at high levels of Zn application.

NOTES

1 Contribution from the Dep. of Soils, Haryana Agric. University, Hissar (India).

2 Professor and Head, and former Research Fellow, respectively.

Received for publication August 9, 1978. Accepted for publication September 27, 1979.






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Copyright © 1980 by the Soil Science Society of America.