黑龙江省北部第五积温带是我省大豆主产区之一,该区过去生产上大面积推广的北丰 3 号、黑河17等品种因熟期适宜,丰产性较好,曾发挥过重要作用,但随着生产的发展、栽培水平的提高及这些品种推广年限的加长,混杂退化现象比较严重,其丰产性和抗逆性等都有所下降,针对生产中的 The fifth accumulated temperate zone in the northern part of Heilongjiang Province is one of the major soybean producing areas in our province. Beifeng No.3 and Heihe 17 cultivated on a large scale in this area have played an important role due to their suitable maturity and high yield, , But with the development of production, the improvement of the cultivation level and the extension of the promotion period of these varieties, the phenomenon of mixed degeneration is more serious, and the yield and stress resistance are all decreased.