Effects of sulfur fertilizers on yield and quality of groundnut var. Tainan 9 grown on Lampang series formerly treated differently with sulfur and phosphate fertilizers
1993
Pranee Sirodomsakul
Field experiment was conducted in a farmer's field at Tambon Chomphu, Amphoe Muang, Lampang Province to study the effects of sulfur fertilizer and residual effects of phosphate fertilizer on the yield and quality of groundnut var. Tainan 9 grown on Lampang Soil Series. A Split Plot in Randomized Complete Block Design with 4 replications was employed. Two types of sulfur fertilizers, ammonium sulfate and gypsum, applied at the rate of 6 kg S per rai were arranged in the main plots. Three types of phosphate fertilizer, namely triple superphosphate, thermal phosphate and rock phosphate, applied at the rate of 12 kg P2O5 per rai for soybean plants in the preceeding cropping were arranged in the subplots. The results showed that the yields of pods, oil, protein, sulfur amino - acids (methionine and cysteine) and S in seed were not affected by the sulfur applications. There was no residual effects of the phosphate fertilizer. No interaction between the 2 kinds of fertilizers was found.
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