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Phosphate Diffusion to Plant Roots¹

ABSTRACT

Diffusion of phosphate appears to account for the observed rates of P uptake by corn roots. A diffusion equation was developed which takes into consideration the effect of plant removal of P on the relationship between solution P and solid phase P, in addition to the tortuosity and ionic interaction factors of the porous system. The equation has the same form as the heat flow equation, hence solutions of the latter can be applied to describe phosphate diffusion in soils.

¹ Contribution from Soil and Water Conservation Research Division, ARS, USDA, and the Colorado Agr. Exp. Sta., Ft. Collins. Scientific Journal Series 706.

² Respectively, Soil Scientist, Northern Plains Branch, ARS, USDA; Soil Scientist, Northern Plains Branch, ARS, USDA, and Associate Agronomist (Soils), Colorado State University, Ft. Collins; and Soil Scientist, Southwest Branch, ARS, USDA, Tempe, Ariz.

Received for publication June 26, 1961. Accepted for publication September 6, 1961.