Potential of chemisorbed phosphates and their capabilities for supplying phosphates to plants
1993
Suphot Totrakool | Nawarat Thepsuwan | Kanokpan Pansombat (Chiang Mai Univ., Chiang Mai (Thailand). Faculty of Agriculture. Dept. of Soil Science and Conservation)
About 70-90 percent, 20-30 percent and less than 8 percent of phosphate fertilizer which was added to the soil series, were retained in the forms of ferric and aluminum phosphates, calcium phosphate, and clay phosphates respectively. Water soluble phosphate was amounted to 2-10 percent. The added phosphates were mainly first adsorbed by clay, then slowly replaced and precipitated as ferric and aluminum phosphates. When applied phosphates according to the general recommendation rate (8-10 kg/P2O5/rai) to soybean grown in Renu soil series, there would be adequate phosphate for two cropping.
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