玉米制种产量的高低,对于降低种子成本,提高单位面积产值有重要的意义。近年来,由于推广了加大密度,改进行比等技术措施,玉米制种的产量有了较大幅度的提高。但由于在播期上没有引起足够的重视,产量很不稳定。例如1982年苑曲村张艮玉制种1.2亩,于5月中旬播种,共产种270公斤,折合亩产225公斤;1983年又制种22亩,于4月14日播种,总产2059公斤,亩产只有93.2公斤。1985年县良种场制种120亩,4月12—22日播种, Maize seed production level, for reducing seed costs, increase unit area output value is of great significance. In recent years, due to the promotion of increased density, improved row ratio and other technical measures, corn seed production has been greatly improved. However, due to lack of attention in the sowing time, the output is very unstable. For example, in 1982, 1.2 hectares were planted in Zhangquanyu Village of Yuanqu Village and sown in mid-May. The total output was 270 kilograms, equivalent to 225 kilograms per mu. In 1983, 22 hectares were planted and planted on April 14 with a total output of 2,059 kilograms , Only 93.2 kilograms per mu. In 1985 county seed production of 120 acres, April 12-22 sowing,