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Movement of Molybdenum in the Soil and its Effect on Availability to the Plant¹

ABSTRACT

The processes involved in Mo availability to corn and soybeans growing in soil were investigated. Both mass-flow and diffusion were involved. Mass-flow caused Mo to accumulate at or in the root when the saturation extract contained more than 4 ppb. Mo. Diffusion patterns were usually obtained by autoradiographic procedures when the content was below 4 ppb. The saturation extracts of the soils investigated ranged from 2.2 to 8.1 ppb. Mo. The content of labile Mo in the soil varied from 41 to 211 ppb. of soil. The values of Dp/b for Mo varied from 0.5 to 8.4 x 10^-7cm.² sec.^-1 and were much larger than for phosphorus.

¹ Journal paper No. 2088. Purdue University Agr. Exp. Sta., Lafayette, Ind. Contribution from the Department of Agronomy. Presented before Div. IV. Soil Sci. Soc. Am., Aug. 22, 1962. at Cornell University, Ithaca, N. Y. This research was supported in part by a grant-in-aid from the Climax Molybdenum Company.

² Assistant Professor of Agronomy, University of Nebraska, formerly Graduate Assistant and Professor of Agronomy, respectively, Purdue University.

Received for publication April 5, 1963. Accepted for publication July 5, 1963.