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Uptake of Phosphorus by Plants Growing Under Field Conditions: I. Theoretical Model and Experimental Determination of its Parameters¹

ABSTRACT

A model for P uptake by plants growing in the field or under controlled growth conditions was developed. The model makes allowance for the apparent diffusion coefficient of P in the soil (D), and the biologically determined parameter relating flux to concentration () to be concentration-dependent. The values of D(C) and (C) were determined directly by new laboratory techniques. The phosphate soil diffusion coefficient (D_p) was practically independent of concentration when the volumetric water contents () of the soil was 0.40. When was 0.57, the dependence of D_p on concentration increased. The dependency of (C) on the age of a unit root surface area of corn (Zea mays L.) was taken into consideration in the model.

¹ Contribution from The Volcani Center, Agr. Res. Org., Bet Dagan, Israel. 1972 Series, No. 2054-E.

² Soil Chemists and Soil Physicist, respectively.

Received for publication February 9, 1972. Accepted for publication May 16, 1972.