80年代以来,我省玉米杂交种已占总面积的70％以上,这是逐步提高玉米单产的重要保证。为此必须抓好杂交种的生产?其关键在于抓好亲本自交系,特别是主要自交系的生产。目前全省杂交玉米推广种中,亲本自交系以“自330”用得最多,据1983年统计达1,134万亩,约占杂交种面积的68.7％以上。占 Since the 1980s, corn hybrids in our province have accounted for more than 70% of the total area, which is an important guarantee for the gradual increase of corn yield. To do this, it is necessary to do a good job in the production of hybrids. The key lies in grasping the production of the parental inbred lines, especially the major inbred lines. At present, among the popularized varieties of hybrid corn in the whole province, the parental inbred lines are mostly used since 330, accounting for 11.34 million mu in 1983, accounting for more than 68.7% of the hybrids. Take up