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1 力争早播,一播全苗夏玉米制种生长期较短,生育期积温不足,是影响其制种产量的主要因素。因此,力争早播是提高夏玉米制种产量的关键。根据我县气候条件及制种玉米前茬多为小麦的实际情况,一般要求在5月下旬进行麦垄套种,最迟不晚于6月5日。特别是用478、8112等生育期较长的亲本作母本的组合,5月底以前一定要套种结束。
1 Strive to be early sowing, planting a whole seedling summer maize species shorter growth period, lack of accumulated temperature during growth is the main factor affecting the seed production. Therefore, striving for early sowing is the key to increase the yield of summer maize. According to the county’s climatic conditions and seed production of wheat more than the actual situation of wheat, the general requirements in late May for wheat ridge interplanting, no later than June 5 at the latest. Especially with 478, 8112 and other longer-growing parents as a combination of the mother, by the end of May must be the end of the intercropping.