Utilization of Filter Cake as Phosphate Source for Paddy in Acid Sulfate Soil I. Effects of Filter Cake on Phosphorus Nutrition of Rice Plant and pH of a Submerged Acid Sulfate Soil.
Abstract
The effects of filter cake on phosphorus nutrition of rice plant and pH of a submerged acid sulfate soil (Rangsit soil) were studied in pot experiment. Filter cake showed significant effect in increasing the amount of available P (Bray II extraction) in submerged acid sulfate soil. The effectiveness of filter cake in increasing available P in acid sulfate soil was comparable to that of KH2PO4. Total P uptake, growth and yield of rice plant were highly related with available P in the soil. Filter cake increased pH of the submerged acid sulfate soil. The ability of filter cake in neutralizing acidity of acid sulfate soil was almost equivalent to that of CaCO3
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