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This article in SSSAJ

  1. Vol. 36 No. 1, p. 55-57
    Received: June 21, 1971
    Accepted: June 25, 1971

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Phosphorus Diffusion in Soils: II. The Effect on Phosphorus Uptake by Plants1

  1. S. K. Mahtab2,
  2. A. R. Swoboda3,
  3. C. L. Godfrey3 and
  4. G. W. Thomas4



Phosphorus uptake by grain sorghum (Sorghum vulgare) was measured at four levels of applied P and three levels of moisture on four related Texas soils. The soils differed mainly in clay content. Phosphorus uptake was found to be a function of clay and water content of the soils and applied P. The total increase in dry matter yield for each addition of P was about the same for each soil except at the lowest moisture level. At the lower moisture levels, response to P additions was not as great on the coarser-textured soils as on the fine-textured soils.

Phosphorus uptake was related to the diffusion coefficients of P previously determined for the four soils subjected to the same treatments as in this study; the correlation coefficient was 0.788.

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