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通过对玉米新品种“中单28”制种关键技术即种植密度和父母本不同播期的研究,确定玉米新品种制种合理密度和父母本适宜播期,从而提高“中单28”制种产量。试验结果表明,北京市密云县北部山区种植“中单28”制种适宜密度是4000～4500株/667m2;父母本适宜播种期是父母本同期播种花期相遇良好。
Through the research on the key technology of seed production of “Zhongdan 28”, that is the planting density and different sowing date of maize, the reasonable planting density of new maize varieties and the proper sowing date of parents were determined, Seed production. The results showed that the suitable planting density of “Zhongdan 28” was 4000 ~ 4500 plants / 667m2 in the northern mountainous area of Miyun County, Beijing. The suitable sowing date of parents was that the parents met the seeding date of the same period.