Breeding of a new table variety of summer soybean "Tongdou 6".

A new table variety of summer soybean,"Tongdou 6",was bred from the Qidong local variety "Qidonglupi" by pedigree breeding method and had such advantages as high yield,good quality,large pods and seeds,and good synthetic character.Its growth period from seeding date to picking time of green pods was about 97 days.The number of normal green pods per kilogram was 364.3,the two-seed pod was 5.72 cm long and 1.34 cm wide,the fresh 100-seed weight was 70.2 g,and the kernel rate was 52.3%.The average fresh pod yield in Jiangsu regional test of table summer soybean was 8 647.1 kghm2,being 24.3% higher than that of the control variety "Lubaozhu" in 2005 and 12.5% higher than that of the control variety "Nannong Caidou 5" in 2006.The average fresh seed yield was 4 492.3 kghm2,being 21.7% higher than that of the control variety "Lubaozhu" in 2005 and 19.1% higher than that of the control variety "Nannong Caidou 5" in 2006.The average fresh pod yield in Jiangsu production test of table summer soybean was 12 500.8 kghm2 and 15.6% higher than that of the control "Nannong Caidou 5",and the average fresh seed yield was 6 750.0 kghm2 and 26.9% higher than that of the control.The variety was suitable for being planted in Jiangsu Province and the middle and lower reaches of the Yangtze River.