Breeding and Cultivation of A New Variety of High-Yield and High-Quality Summer Soybean Tongdou 13

In order to promote the new summer soybean varieties Tongdou 13, which has high quality and high yield, this article introduced the breeding process, characteristics, yield performance, sowing date test and cultivation technology of Tongdou13. Tongdou 13（formerly No.16-01） was bred through generative hybridization between ‘Pudongdahuangdou’（female parent） and ‘Yanchengganjiangnan’（male parent） with pyramiding breeding and systematic selection by Jiangsu Yanjiang Instiute of Agricultural Sciences. Tongdou 13 participated in the Huainan summer soybean regional experiment in Jiangsu Province from 2017 to 2018. The average yield of Tongdou 13 was 2 839.5 kg·ha^-1, 10.74% higher than the control Tongdou 7.Tongdou 13 participated in the production test in 2019. The average yield was 2 757.3 kg·ha^-1,increasing 10.08% over the control Tongdou 7. In April 2021, Tongdou 13 passed the validation by Jiangsu Provincial Crop Variety Certification Committee. The approval number was Sushendou 0210011. This veriety has a growth period of 106 days, a plant height of 67.8 cm, 4.3 effective branches, 59.7 pods per plant and 1.9 per pod. Its 100-seed weight is 23.3 g. Its crude protein and crude fat content are 42.4% and 18.8% respectively. The variety shows a strong lodging resistance. It is moderate susceptible to soybean mosaic virus SC3 strain and susceptible to SC7 strain. Tongdou 13 is suitable for planting as summer soybean in Jiangsu Huainan Area of and surrounding similar ecotopes.