１．问题提出大豆是典型短日照作物，具有严格的区域性。育种实践证明，在某一生态区内要选择适宜其它生态区的，并具有良好生态类型的新品种（系）是非常困难的。我们根据稳定黑农号大豆品种在第一、二积温区主栽品种面积地位，并向第三、四积温区扩展原则，即扩大黑农号... 1. The issue raised Soybean is a typical short-day crops, with strict regional. Breeding practice has proved that it is very difficult to select new varieties (lines) which are suitable for other ecological zones and have good ecological types in an ecological zone. We are based on the stability of black no. Soybean varieties in the first and second accumulated temperature area of ​​?? the main cultivated species area status, and to the third and fourth accumulated temperature area expansion principle, that is to expand the black ...