Study on yield and agricultural characteristics of soybean cultivars in Eastern Thailand
1997
Teera Somwang | Amnuay Yothasiri | Nopasool Samudthong (Kasetsart Univ., Bangkok (Thailand). Insee chandratitya Inst. Kaohinson Research Station)
Thirty-three soybean Varieties were under study to Compare their growth and yield. Twenty Varieties Carrying the Juvenile genes were introduced from Brazill. This type of genes would allow the soybean plants to be less sensitive to photoperiod changes and thus lengthening their vegetative growth period without altering their maturity date. Another 11 Thai varieties were used as checks. The soybean varieties were grown during the rainy season and the dry season of 1997 at Kaohinson Research station, Chachoengsao province. The results of the experiment in 1997 revealed that the average yield (195 kg/rai) of the Thai varieties. This was dye to their higher number of seeds/plant (88 seeds/plant), number of seeds/pod (1.40 seeds/pod). Seed size (16.5 gram/100 seeds) and Rainy season 1997 the yields of the two groups of soybean were not significantly different. The average higher number of pod/plant of the Brazilian varieties was 67 pods/plant while that of the Thai varieties. The yield of the Brazilian varieties were positively correlated with the number of pods/plant, number of nodes/plant, number of branches/plant, date of first flowering and the R1/R8 age ratio. In comparison with the Thai varieties, those Brazilian varieties with high yield tended to have high number of pods/plant, number of nodes/plant and number of branches/plant. The high yielding a soybean varieties also has short internodes with the plant height remained unchanged. Athough there was a delay in the first flowering date the maturity date was not affected.
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