Potential of four soybean populations when grown and selected in the western region
1996
Nipon Iamsupasit | Chalermpol Lairungreung | Somsak Srisombun | Kanyarat Archvichai | Sudkhet Archkongharn (Department of Agriculture, Bangkok (Thailand). Field Crops Research Inst. Suphan Buri Field Crops Research Center)
Soybean has been referred as one of the important crop in the Western Region of Thailand. At present, soybean production from this region is not sufficient to meet the domestic consumption demand. However, there is a possibility to increase its production in the region. A high yield variety which adapts well to the region have to be considered. To develop such a variety, four F4 populations viz. CM 9238, CM 9207, CM 9203 and CM 9206 were introduced from Chiang Mai Field Crops Research Center and selected in the Kamphaeng Saen Soil Series at Suphan Buri Field Crops Research Center. Each population was practiced in three stages of selecion, bulk seed in 1994 early rainy season, single plant selection in 1994 late rainy season and line or family selection in 1995 early rainy season. Data from the single plant selection trial, especially grain weight/plant, indicated that mean and standard deviation of CM 9238 were the highest whereas those from CM 9206 were the lowest. This suggested that CM 9238 possessed more possibility to select for high yielding varieties than the other populations. Results from family selection trial confirmed this idea. The first ten selected lines of CM 9238 had adjust mean grain yield in the range of 368-543 g/2.5 sq.m. which was higher than those from the other populations. Simple correlation was also studied from the data of single plant selection trial. It was found that there were significant positive correlations in number of nodes/plant, pods/plant, grain weight/plant and seeds/plant in all four populations. About 20-25 lines from each population were selected for further testing in 1996 early rainy season.
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