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This article in SSSAJ

  1. Vol. 25 No. 4, p. 289-294
     
    Received: Aug 8, 1960


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doi:10.2136/sssaj1961.03615995002500040018x

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

  1. S. R. Olsen,
  2. F. S. Watanabe and
  3. R. E. Danielson2

Abstract

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.

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