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This article in SSSAJ

  1. Vol. 24 No. 3, p. 161-164
    Received: Sept 28, 1959
    Accepted: Feb 3, 1960

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The Effect of Soil Water Movement vs. Phosphate Diffusion On Growth and Phosphorus Content of Corn and Soybeans1

  1. Raymond E. Shapiro,
  2. W. H. Armiger and
  3. Maurice Fried2



The effect of soil water movement vs. phosphate diffusion on plant growth and composition was studied by soil-sand dilution and continuous movement of the soil solution by recirculation. Yield, percent P, and P uptake of corn and soybeans remained approximately constant at soil-sand dilutions up to 1:1.1 by volume, but decreased at greater dilutions in both the recirculated and noncirculated (normal watering) systems. Recirculation increased yield and percent P of corn and soybeans. These increases were attributed partly to the sampling of a larger soil volume for replenishment of the soil solution. The diffusion process alone was unable to renew P at the root surface as fast as the observed uptake rate. Soil water movement probably accounts for a much greater transfer of P to the root surface than diffusion.

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