Effect of silicic acid on phosphorus uptake by rice plant

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Abstract
The Effect of silicic acid on the phosphorus uptake by rice plants (Oryza sativa L. cv. Akebono) grown in a culture solution was studied by several experiments. In long-term experiments, both the content and the uptake of phosphorus were decreased by the addition of silicic acid, and the effect was more pronounced at the vegetative stage than at the reproductive stage. Under the different phosphorus supply levels ranging from deficient to excess (from 0.1 to 50 ppm as P2O5), we found that, when the phosphorus level in the medium was low, the retardation effect of silicic acid on the phosphorus uptake was hardly observed, but with the rise of the phosphorus level in the medium, the effect became severe, especially at excess level. The rice plants which received silicic acid in advance (pretreatment) absorbed less phosphorus compared with those which were not pretreated with silicic acid, suggesting that the phosphorus uptake was also influenced by the silicon already present in the rice plants. There was no significant difference in the organic-P content between the —Si plants and + Si plants, but the inorganic-P content in the —Si plants was higher than that in the + Si plants. This fact suggests that the excess phosphorus absorbed by the —Si plants was almost completely in the inorganic-P form. In the inorganic-P form, the content of cations such as Ca, Mg, Fe, Mn, was also higher in the —Si plants than in the +Si plants, suggesting that these excess cations probably combine with the excess phosphorus in the —Si plants.

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