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1.精细整地。选择排灌设备齐全、土质肥沃的土地为制种田,在秋季封冻前及时进行秋翻,深度为22～24厘米,然后用河水漫灌,春季顶凌耙地,并结合耙地进行倒沙,(即把灌水时冲积的淤沙倒到洼地或土壤粘重的地方)磨平土地,准备播种。 2.适时早播。一般在4月20～30日播种,比当地制种田和生产田提早3～5天播完。采用犁开沟、人点种、磨复土的方法播种,复土厚度4～5厘米,然后再磨两遍。为防治地下害虫,用种子重量的0.4%的锌硫磷拌种(湿种),拌后闷种4小时即可使用。父母本同期播种。 3.加大行比,合理密植。根据多年制种经验,看到中单2号的父本花粉量较大,加大行比后仍可以保证授粉,因此,把过去的2:4～2:6
Precise preparation Select well-drained and fertile land for farming, autumn fall in time before the autumn turn, depth of 22 to 24 cm, and then flood irrigation, the top of the spring rake, and combined with harrow to sand, (ie Alluvial irrigation when the sediment poured into the depression or soil sticky place) ground flat, ready to sow. 2. timely early broadcast. Generally sown on April 20 to 30, than the local farming and production fields broadcast sowing 3 to 5 days earlier. The use of plow ditches, people kind of species, the method of mounding soil seeding, soil thickness 4 ~ 5 cm, and then grinding twice. For the control of underground pests, 0.4% by weight of seed dressing zinc sulfate (wet), mixed bored 4 hours before use. Parents planted the same period. 3. Increase the line ratio, reasonable density. According to many years of seed production experience, to see Zhongdan 2, the larger the male pollen, increase the line ratio can still ensure pollination, therefore, the past 2: 4 ~ 2: 6