The study on climatic Adaptation of Soybeans at Kamphaeng Saen, a Representative of Central Plain of Thailand

Abstract

Twenty soybean genotypes of diverse origin and maturity were grown at Kamphaeng Saen Campus of Kasetsart University in the Central Plain region of Thailand. The purpose of this study was to obtain basic informations on the relative effect of sowing dates and cultivars on the performance of this crop. Soybeans were sown at monthly interval between June 1986 until May 1987. Measurements included phenology, total plant weight and yield. It was found that days to flower of soybeans were affected by daylength and temperature. Cultivars least affected by photoperiod were most affected by temperature particularly during the cooler months. Days to maturity was dependent upon days to flowering. Total plant weight and grain yield were strongly affected by phenology. Cultivars which flowered and matured properly would produced considerable amount of plant dry matter and grain yield.