The Effect of Soil Water Movement vs. Phosphate Diffusion On Growth and Phosphorus Content of Corn and Soybeans1
- Raymond E. Shapiro,
- W. H. Armiger and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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