Studies on soils and fertilizers for peanut production: Long term effects of phosphate fertilizer on yield of peanut in rice-peanut sequential cropping system in Lampang soils
1990
Chairerk Suwannarat | Amnat Suwanarit | Chamchan Vijarnsorn (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Soil Science)
Study the long term effects of phosphate fertilizer on yield of peanut in rice-peanut sequential cropping system in Lampang soils, the on-farm research was conducted in Amphoe Muang, Lampang province. In rainy season, two kinds of phosphate fertilizer namely triple superphosphate (TSP) and rock phosphate (RP) were tested on the RD6 glutinuos rice. The application rates were 4 kg P2 O5 per rai of TSP compared with 2 rates of RP:50 and 100 kg per rai. After harvesting rice, the peanut, promissing line KUP 24 D-421 was grown drying dry season in order to study the residual effect of those phosphate fertilizers on the yield of legume. In addition, one extra treatment namely TSP at the rate of 9 kg P2O5 per rai was added into the treatments for the peanut. Based on the experimental results it can be concluded that rice did not have any response to phosphate fertilizer whereas the residual phosphate fertilizer affected both peanut yield and phosphorus content. Higher yield and higher content of P in seed were observed in the residual plots of both rock phosphate rates. The low and high rates of rock phosphate increased pod yield by 34 and 39 percent respectively.
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