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This article in SSSAJ

  1. Vol. 25 No. 4, p. 289-294
    Received: Aug 8, 1960
    Accepted: Oct 13, 1960

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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



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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