At Chiang Mai FCRC, Chiang Mai 60, the most popular variety among Thai farmers in the upper north and central region, gave an average grain yield of 1.69 t/ha (Table 1), compared to the national average yield of 1.53 t/ha during 2003-2005 [1]. In general, the later days to maturity of the soybean, the greater the yield produced [2]. A mutant DT84 from Vietnam matured 18 days earlier than that of Chiang Mai 60, 101 DAS. However, it gave average grain yield of 1.74 t/ha, similar to that of Chiang Mai 60 (Table 1). In addition, DT84 had 11% larger seed size than Chiang Mai 60, 13.7 g/100 seeds. Desirable soybean grain of the Thai market for food products should have similar or larger seed size than Chiang Mai 60. DT84 is suitable to be grown in the rice-based cropping system and it is very promising for farmers in the upper northern area of the country [3]. At Sukhothai PPTSC, no introduction gave better yield than Thai variety Sukhothai 2, except a mutant Bangsakong from Korea produced the highest grain yield of 2.08 t/ha averaged from the 2005 trials, 11% higher than that of Sukhothai 2 (Table 1). Bangsakong matured 12 days earlier than Sukhothai 2, 94 DAS (Table 1). It produced similar seed size with Sukhothai 2, 14.5 g/100 seeds. Bangsakong is also a promising mutant for farmers grown in rice-based cropping system in the lower north of Thailand [3]. During 2006-2007, mutant varieties DT84 and Bangsakong were improved by the method of mass selection at Chiang Mai FCRC. The seed of two varieties was also multiplied for further test of their performance in farmers’ fields prior to released.
At Chiang Mai FCRC, Chiang Mai 60, the most popular variety among Thai farmers in the upper north and central region, gave an average grain yield of 1.69 t/ha (Table 1), compared to the national average yield of 1.53 t/ha during 2003-2005 [1]. In general, the later days to maturity of the soybean, the greater the yield produced [2]. A mutant DT84 from Vietnam matured 18 days earlier than that of Chiang Mai 60, 101 DAS. However, it gave average grain yield of 1.74 t/ha, similar to that of Chiang Mai 60 (Table 1). In addition, DT84 had 11% larger seed size than Chiang Mai 60, 13.7 g/100 seeds. Desirable soybean grain of the Thai market for food products should have similar or larger seed size than Chiang Mai 60. DT84 is suitable to be grown in the rice-based cropping system and it is very promising for farmers in the upper northern area of the country [3]. At Sukhothai PPTSC, no introduction gave better yield than Thai variety Sukhothai 2, except a mutant Bangsakong from Korea produced the highest grain yield of 2.08 t/ha averaged from the 2005 trials, 11% higher than that of Sukhothai 2 (Table 1). Bangsakong matured 12 days earlier than Sukhothai 2, 94 DAS (Table 1). It produced similar seed size with Sukhothai 2, 14.5 g/100 seeds. Bangsakong is also a promising mutant for farmers grown in rice-based cropping system in the lower north of Thailand [3]. During 2006-2007, mutant varieties DT84 and Bangsakong were improved by the method of mass selection at Chiang Mai FCRC. The seed of two varieties was also multiplied for further test of their performance in farmers’ fields prior to released.
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