玉米杂种优势的利用,已成为生产上的增产措施之一,一般比当地玉米品种增产30%或更多一些。但玉米杂交种以第一代增产最显著,以后连续种植,由于产生分离,产量就逐渐下降,因此杂交种需要年年配制,以保证生产上每年都有足够的高产杂交种种子。怎样做好玉米杂交种的繁殖制种呢?现将有关制种技术介 Utilization of maize heterosis has become one of the measures for increasing production in production, which generally increases by 30% or more than that of local corn varieties. However, the first generation of corn hybrids yield the most significant, after continuous planting, due to the separation, the yield will gradually decline, so hybrids need to be formulated every year to ensure that each year in production have enough high-yielding hybrid seeds. How to do a good job of breeding hybrid corn breeding it?