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普及玉米杂交种,是提高玉米产量经济有效的措施之一,但因制种产量低,满足不了大田用种,供求矛盾十分尖锐。为了提高制种产量,我们从1975年起,重点摸索和改进了予农704、郑单二号、博单一号这三个杂交组合的父母本行比、播种方式和密度。改常规制种父母本的1∶2为1∶3,最高试验到1∶6;改等行距为宽窄行条带播种,改3500株为6000株的种植密度,收到了良好效果。最高产种量每亩达到:郑单二号
The popularization of corn hybrids is one of the measures to increase the yield of maize economically and efficiently. However, due to the low seed production rate and the inability to meet the needs of the field, the contradiction between supply and demand is very acute. In order to improve the seed production, we started in 1975 and focused on exploring and improving the parents’ ratio, planting methods and density of the three crosses of Yuongnong 704, Zhengdan II and Bo Danang. Change the conventional parents of the species 1: 2 1: 3, the highest test to 1: 6; to change the line spacing for the width of the narrow strip sowing, to change the planting of 3500 plants for the density of 6,000, received good results. The highest yield per acre reached: Zheng Dan II