Breeding and Cultivation Technology of New High-Yield Soybean Variety Kedou 59

In order to promote the popularization of the new soybean variety Kedou 59 with high yield, the breeding process, characteristics, yield performance and cultivation key points were introduced.Kedou 59 is a new soybean variety breed by Keshan Branch of Heilongjiang Academy of Agricultural Sciences through sexual hybridization and systemmatic selection with Keshan 1 as female parent and Kenjiandou 28 as male parent. From 2019 to 2020, Kedou 59 participated in the national experiment of early-maturing group of northern spring soybean variety trial regional test, with an average yield of 2 832.0 kg·ha^-1, increased by 9.4% compared with Keshan 1（CK）. In 2021, it participated the national experiment of early-maturing group of northern spring soybean variety trial production test, with an average yield of 2 748.3 kg·ha^-1, 8.6% higher than that of the CK. The test results showed that the protein content of Kedou 59 was 37.83% and fat content was 19.89%. And it was middle resistant to grey speck of soybean（Cercospora sejina）. In 2022, it was approved by the National Crop Variety Approval Committee with the approval number of Guoshendou 20220017. It is suitable for being planted in in the lower limit of the third and the upper limit of the fourth accumulation zone of Heilongjiang Province, the mountainous area in the eastern part of Jilin Province, and the central and southern areas of the Nenjiang River Basin east of Greater Khingan in Hulunbuir in Inner Mongolia.