Abstract
We correlated the values of various inorganic phosphate fractions and phosphate extracted with seven soil chemical extractants in air-dry and waterlogged Alfisols of Himachal Pradesh, India, with grain yield and phosphate uptake from unfertilized soils, and with percentage of grain yield and percentage of phosphate uptake by rice grown under waterlogged conditions in the greenhouse. We found that Fe-P was the most important inorganic phosphate fraction contributing to phosphate nutrition of rice and that Al-P was next in importance. The Bray P2 soil extractant was the most effective in extracting phosphate from Fe-P and Al-P fractions of soil phosphate in both air-dry and waterlogged soils. This method correlated well with all the growth parameters of plants grown under waterlogged conditions. The results suggest that the Bray P2 method can be used on air-dry soils in predicting phosphate availability and response of rice to phosphate fertilization. In this group of soils, the response of rice to phosphate application was invariably observed to be in accord with the Bray P2 extractable phosphorus.
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