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Manganese Uptake Attributed to Diffusion from Soil¹

ABSTRACT

An investigation of the rate of self-diffusion of ⁵⁴Mn in 6 soils gave apparent diffusion coefficients that varied from 0.33 x 10^-7 to 2.20 x 10^-7 cm² sec^-1.

Uptake studies with corn seedlings gave a high correlation between Mn uptake and the calculated Mn reaching the root by diffusion. Calculation of the concentration gradient necessary to satisfy the Mn uptake rate by diffusion indicated that the Mn concentration at the root surface was only reduced about 5%.

¹ Paper no. 3162, Purdue University, Agr. Exp. Sta., Lafayette, Ind. Contribution from the Department of Agronomy. This study was supported in part by a grant from U.S. Steel Corp.

² Former graduate assistant, Purdue University, now Assistant Professor, University of Saskatchewan, Saskatoon, Canada and Professor of Agronomy, Purdue University, respectively.

Received for publication September 5, 1967. Accepted for publication March 4, 1968.