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Phosphorus Absorption by Corn Roots as Affected by Moisture and Phosphorus Concentration¹

ABSTRACT

The relative uptake of P by corn seedlings was 100, 94, 80, 50, and 35 for 1/3, 1/2, 1, 3 and 9 bars soil moisture tension, respectively. Uptake of P was a linear function of the soil moisture content for a given soil. Thickness of moisture films, diffusion path length, degree of hydration and elongation of the roots appeared to be the factors controlling P uptake in relation to moisture tension. Uptake of P at constant moisture tension on soils differing in texture and soluble P level was a linear function of solution P concentration, but the range of concentration investigated was small. Phosphorus uptake from a soilroot system differs appreciably from a solution-root system, which suggests that the soil introduces a limiting factor in rate of P uptake.

¹ Contribution from Soil and Water Conservation Research Division, ARS, USDA, and Colorado Agr. Exp. Sta. cooperating. Scientific Journal Series 667.

² Soil Scientists, Western Soil and Water Management Research Branch, SWCRD, ARS, USDA, and Associate Agronomist, Colorado Agr. Exp. Sta., Fort Collins, Colo.

Received for publication August 8, 1960. Accepted for publication October 13, 1960.