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陕西省永寿县往常每年玉米制种安排6000亩面积,实收只有4000亩,亩产八、九十斤,年年制种,年年缺种。从1980年开始取消社制社繁,由县统一制种。在技术措施上进行了较大的改进:母本增行,父本增株。如制中单2号采用6:1或8:1行比,效果明显;调整株、行距,增加留苗密度。根据当地自然条件,采用1.35尺×1.2尺～1.3尺的种植方
Yanshou County, Shaanxi Province, the usual arrangement of annual 6000 acres of corn seedlings, harvest only 4,000 acres, mu per kilogram, ninety pounds, annual seed, lack of species every year. Since 1980, the social system was abolished and the county unified the seed. Significant improvements have been made in technical measures: parental growth and parental growth. If the system in the No. 2 with 6: 1 or 8: 1 line ratio, the effect is obvious; adjust strains, row spacing, increase the density of seedlings. According to the local natural conditions, using 1.35 feet × 1.2 feet ~ 1.3 feet of planting