Study on suitability of long juvenile trait soybean for dry season cultivation in the central plain of Thailand
1998
Aphiphan Pookpakdi(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Agriculture. Department of Agronomy) | Sakorn Somjit(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Agriculture. Department of Agronomy) | Charoen Thuamkham(Department of Agriculture, Bangkok (Thailand). Regional Research and Development Office, Area 5)
150 soybean accessions from Brazil and other sources around the world had been brought to Thailand. These lines were subsequently selected at Kamphaeng Saen in two sets of experiments conducted in early rainy, late rainy and dry seasons. From the studies conducted, 9 soybean accessions were further selected for planting at Chainat Field Crop Research Center and Kamphaeng Saen campus, In those trials conducted in 1995, soybean lines were planted under ample and limited irrigation having CM 60 as the check cultivar. It was found that soybean accessions CPAC 150-76, CPAC 562-76, CPAC 98-76, CPAC 639-76 and CPAC 359-76 ranked 1 to 5 highest yield among cultivar tested when planted at Chainat and Kamphaeng Saen. Planted under ample and limited irrigation did not caused any significant yield difference. These promising accessions fixed very high rate of N2-fixation of higher than 75 percent relative uride at Kamphaeng Saen and Chainat. One of the reason to explain for better growth rate, N2-fixation and yield production of these introduced soybean accessions could be the long juvenile trait which is the characteristics they imposed. Long juvenile gene caused the lengthan of soybean vegetative growth in these soybean accessions when they were grown in the dry season in the central plain where daylength at planting were relatively short.
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