Study on plant nutrient factors affecting soybean production in Paleustults in Eastern Region of Thailand
1994
Somsak Luangsa-ard
Soybean production in Paleustults were studied using Kabin Buri soil series and Mab Bon soil series as representatives of low and medium soil fertility status, respectively. Two field experiments and a greenhouse one were carried out. The result showed positive response to rhizobium, liming and some rates of chemical fertilizer of SJ4 soybean on low fertile soil. Rhizobium inoculation in combination with 800 kg marl/rai and 1:4:1, 1:3:1 ratio of chemical fertilizer at the rate of 4, 16, 4 and 4, 12, 4 kg/rai of N, P2O5 and K2O gave the yield of 388 and 386 kg/rai, respectively. However, economic evaluation using value cost ratio (VCR) illustrated that rhizobium and the chemical fertilizer gave the best short-term return under good care in the greenhouse experiment. However, N, P, K, Mg, S, Ca, Fe and Zn were limited plant nutrients for soybean in the low fertility soils. In medium fertility soil, rhizobium inoculation 400 kg marl/rai and 6, 12, 3 and 3, 9, 3 kg/rai of N, P2O5 and K2O gave 394 and 315 kg/rai yield which were in the maximum yield range. However, the economic analysis clearly showed that the VCR were rhizobium and 3, 9, 6 and 3, 9, 3 kg/rai of N, P2O5 and K2O. Under careful greenhouse omission experiment, however, N, P, K, S, Ca and Mg were limiting plant nutrients to the soybean in the medium fertile soils instead of N, P, K demonstrated in the field.
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