我省地处我国的最北部,生态环境复杂,南北积温相差很大,无霜期短。由于生态环境复杂,自然灾害频繁,因此,我省种子生产,特别是两杂亲本种子生产常出现短缺和不足。为保证我省良种繁制,自1969年以来,我省开始组织大面积南繁,到1995年已连续搞了26年,对 Our province is located in the most northern part of our country, the ecological environment is complex, a great difference between North and South accumulated temperature, frost-free period is short. Due to the complex ecological environment and frequent natural disasters, the seed production in our province, especially the production of two-parent parental seed, often shows shortages and shortcomings. In order to ensure the good variety of our province, since 1969, our province has started to organize a large area of ​​Nanfan, and has been engaged in a continuous series of 26 years since 1995.