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

ABSTRACT

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.

¹ Contribution from the Dep. of Soil & Crop Sciences, Texas A&M University, College Station, Tex.

² Formerly Graduate Student, now Associate Principal Research Scientist, Technology Inc., Houston, Tex.

³ Associate Professor and Professor, respectively, Texas A&M Univ., College Station, Tex. 77843.

⁴ Formerly Texas A&M Univ., now Professor, Univ. of Kentucky, Lexington.

Received for publication June 21, 1971. Accepted for publication June 25, 1971.