SC704玉米杂交种,它的两个亲本ZPL773(母本)和ZPL717(父本)生育期不同,在制种生产中,父母本同期播种花期不遇。在南斯拉夫,制种田分三期播,即先播母本,待母本芽长2公分播第一次父本;母本出现2片叶播第二次父本;区内先期制种的单位介绍,母本播后6—8天播第一次父本,12—14天播第二次父本,父母本花期相遇,母本结实良好。 精河地区春季缺水,气温不稳定,干旱多风,土壤失墒快,“分三期播种”,需要二次浇水,行间浇水困难大,费工多,掌握 SC704 maize hybrids, whose two parents, ZPL773 (female parent) and ZPL717 (male parent), have different growth periods. In seed production, parental flowering of the same period did not occur. In Yugoslavia, the system of farming was divided into three phases: the first sowing of the mother flower, the first sowing of the male bud by 2 cm; the second sowing of the mother flower by 2 sowing leaf; the first sowing unit in the area Introduction, the mother of 6-8 days after sowing broadcast the first father, 12-14 days sowing the second paternal, the parents of the flowering meet, the mother of good solid. Jinghe spring lack of water, the temperature is unstable, dry and windy, the soil moisture loss, “three seeding,” the need for secondary watering, watering between rows is difficult, more work, grasp