Phosphorus Diffusion in Soils: II. The Effect on Phosphorus Uptake by Plants
1972
Mahtab, S. K. | Swoboda, A. R. | Godfrey, C. L. | Thomas, G. W.
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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