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推广良种,实行选种是增产大豆的重要措施之一。大豆属於短日照作物,它对光照的反应很敏锐,因此大豆品种的适应范围受南北地域的限制很大,也就是说大豆品种的地区适应性比别的作物小。一般大豆品种由南向北移植,生育期都延长,不能在霜前成熟;由北向南移植,常提早开花,生长不良,而且即使在同一地区,因地势不同,选用的品种亦不同。
The promotion of improved varieties, the implementation of selection is one of the important measures to increase soybean production. Soybean is a short-day crop, its response to light is very sensitive, so the adaptability of soybean varieties by the North-South geographical restrictions, which means that the soybean varieties of the region less adaptable than other crops. Generally, the soybean varieties are transplanted from south to north, and their growth period is prolonged. They can not mature before frost. Transplantation from north to south often starts early flowering and grows poorly. Even in the same area, the varieties used are different because of different topography.