一、四年一贯制繁制体系的产生玉米杂交品种四年一贯制繁制体系(以下简称四年一贯制繁制体系),是我省近年来在玉米种子生产中施行的一种繁制体系。它是根据我省多年生产实践中存在的玉米杂交亲本混杂退化严重、推广速度慢等问题提出来的。它是指玉米杂交品种种子的生产,由亲本繁殖到杂交制种只用四年时间。几年来,运用这个体系对我省的种子工作和农业生产产生了一定的积极影响,也为我们今后进一步建立和完善具有中国特色的种子生产体系提供了有益的 One or four years consistent system of production system Maize hybrid system Four-year system of traditional reproduction system (hereinafter referred to as four-year system of traditional reproduction system), is our province in recent years in the corn seed production implemented a system of reproduction . It is based on many years of production practice in our province there is a serious hybrid degeneration of maize hybrids, slow promotion and other issues put forward. It refers to the production of corn hybrid varieties of seeds, from the parents to hybrid breeding only four years. In recent years, the use of this system has had some positive effects on the seed work and agricultural production in our province, and has also provided beneficial results for our further establishment and improvement of the seed production system with Chinese characteristics in the future