我场玉米制种过去多采用70厘米行距,父、母本行数比例为2∶4,单交种母本公顷产量一般为1.3吨,好的可达1.5吨,差的不足1吨,经济效益较低。1987年我们对玉米制种技术进行改进,261公顷单交种制种田(垦44×冬10为165公顷,垦44×冬17为96公顷)平均公顷产量1.523吨,其中包括50公顷垦44×冬10由于播种过深,母本只六七成苗,父本只五成苗;96公顷垦44×冬17,于 In the past, we used 70 cm row spacing for maize seed production. The ratio of parents to maternal rows was 2: 4. The output of single seed maternal hectare was generally 1.3 tonnes, well up to 1.5 tonnes and the difference was less than 1 tonne. The economy Low efficiency. In 1987, we improved the technology of maize seed production. The average hectare output of 261 hectares in a single-cropping system (165 m ha of Ken 44 × Dong 10 and 96 ha of Ken 44 × Dong 17) was 1.523 tons, including 50 ha Ken 44 × Winter 10 due to sowing too deep, the mother only sixty-seven into seedlings, only five percent of the male parent; 96 hectare Ken 44 × winter 17, at