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Diffusion of Zinc in Soil: I. The Influence of Soil Moisture¹

ABSTRACT

Effective Zn diffusion coefficients, D_e(Zn), were determined at several soil moistures on six soils by allowing ⁶⁵Zn diffuse from the soil into cation exchange resin paper placed on the surface of the soil. At 13% volumetric moisture D_e(Zn) values ranged from 10^-11 to 10^-8 cm²/sec with the range narrowing as the soils approached moisture saturation. In five of six soils, the effect of increasing moisture level on D_e(Zn) could be explained by its effects on tortuosity and on solution Zn concentration. When solution Zn remained constant as moisture level increased, the relation between D_e(Zn) and volumetric moisture was hyperbolic. When solution Zn level dropped as moisture increased D_e(Zn) changed very little. In one soil where variation in D_e(Zn) with moisture level was not explained by these two factors, a third unknown factor apparently influenced D_e(Zn).

¹ Journal Paper no. 4347. Purdue University Agr. Exp. Sta., Lafayette, Ind. 47907. Contribution from the Department of Agronomy.

² Former Graduate Assistant, now Research Associate, and Professor of Agronomy, Purdue University, respectively.

Received for publication May 17, 1971. Accepted for publication June 25, 1971.