Utilization of organic industrial wastes as fertilizers for paddy in acid sulfate soil
1990
Pattama Sangborisuit
First experiment; filter cake increased amount of available P (Bray II) in the submerged acid sulfate soil, which was the same as fertilizer (KH2PO4). Effectiveness of filter cake in neutralizing acidity of acid sulfate soil was similar to CaCO3. The second experiment: effectiveness of filter cake in increasing available P in acid sulfate soil was similar to KH2PO4 and triple superphosphate but higher than rock phosphate. Application of filter cake combined with either (NH4)2SO4 or urea significantly increased growth, yield and total P uptake of rice plant. Third experiment; GML glutamic mother liquor and humus significantly increased NH4+ content in submerged acid sulfate soil. GML increased growth, yield and total N uptake of rice plant, Grain yield of the rice plant grown in the soil amended with GML was 83 and 82 percent of rice plant grown in soil amended with (NH4)2SO4 and urea, respectively. Grain yield of rice plant grown in the soil amended with humus was 34 and 33 percent of rice plant grown in the soil amended with (NH4)2SO4 and urea respectively. The fourth experiment; application of either GML in combination with filter cake or humus combined with filter cake increased NH4+ and available P (Bray II) content in the soil. Either GML combined with filter cake or humus combined with filter cake increased growth, yield, total N uptake and total P uptake of rice plant. Grain yield of the rice plant grown in the soil amended with GML combined with filter cake was 84 and 83 percent and grain yield of rice plant grown in the soil amended with humus combined with filter cake was 71 and 70 percent of rice plant grown in the soil amended with (NH4)2SO4 combined with KH2PO4 and urea combined with KH2PO4, respectively
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