Residual effects of phosphate fertilizer on the yields of rice and peanut grown in the third year in Lampang soils
1992
Chairerk Suwannarat | Amnat Suwanarit | Chamchan Vijarnsorn (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Soil Science)
To study the long-term effects of phosphate fertilizer in Lampang soils on the yield of rice and peanut in rice-peanut sequential cropping system, an on-farm research was conducted in Amphoe Muang, Lampang province for three successive years. In the first year, two kinds of phosphate fertilizer, namely triple superphosphate (TSP) and rock phosphate (RP), were tested on the RD6 glutinuos rice in the rainy season. The application rates were 4 kg P2O5 per rai of TSP and 2 rates (50 and 100 kg per rai) of RP. After harvesting the rice, a promissing line peanut, KUP 24D-421 (large seed variety), was grown during the dry season in order to study the residual effects of those phosphate fertilizers on the yield of the legume. To study the residual effect of phosphate fertilizers applied in the first year, the rice and peanut were planted in rainy and dry seasons, respectively, of the second and the third years. From results of the three-years studies, it could be concluded that rice did not show any response to the fresh and residual phosphate fertilizers whereas the legume showed responses to the residual P. Higher yields and higher contents of P in seed were observed from the plots applied with rock phosphate. Both the low and high rates of rock phosphate. Both the low and high rates of rock phosphate increased pod yields in the first year by 34 and 39 percent, in the second year by 41 and 40 percent, in the third year by 34 and 43 percent and total pod yields of 3 years by 36 abd 40 percent respectively.
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