辽西朝阳为半干旱低山丘陵区，年降水 400～ 500mm，无霜期 145d左右，≥ 10℃积温 3000℃ /年，自然隔离条件好，适于繁育各杂交玉米品种，是全国杂交玉米种子生产的重要基地，每年均有近亿公斤优质杂交玉米种子销往全国各地。随着农业产业结构调整和种子市场竞争的日趋激烈 Western Chaoyang semi-arid hilly region, annual precipitation 400 ~ 500mm, frost-free period of about 145d, ≥ 10 ℃ accumulated temperature 3000 ℃ / year, natural isolation conditions are good for breeding of all varieties of hybrid corn is the national hybrid corn seed production is important Base each year nearly 100 million kilograms of high-quality hybrid corn seeds are sold throughout the country. With the adjustment of agricultural industry structure and the increasingly fierce competition in the seed market