1播前准备重视制种田播前管理,主要是安全隔离、测土施肥、种子生产档案的建立、亲本种子质量的复检和亲本种子包衣等,这是实现优质高产玉米杂交种子生产的前提。1.1安全隔离隔离方法为空间隔离、时间隔离和屏障隔离,可根据种子田的实际情况,确定隔离方式。空间隔离区不少于300m;甜、糯玉米和白玉米种子田隔离区应在400m以上。在多风地区,特别是隔离区地势较低或处于下风口时,还应增大隔离距离。1.2整地,施肥充分了解土壤养分情况,进行测土配方施肥,播种 1 pre-broadcast prepared to pay attention to the system of pre-sowing pre-sowing management, mainly safety isolation, soil testing and fertilization, the establishment of the file seed production, the parent seed quality review and the parent seed coating, which is the premise of high quality and high yield of hybrid corn seed production . 1.1 Safety Isolation Isolation methods for space isolation, time isolation and barrier isolation, according to the actual situation of the seed field to determine the isolation. Space isolation area not less than 300m; sweet, waxy corn and white corn seed field isolation area should be more than 400m. In windy areas, especially when the area is low or in the downcomer, the isolation distance should also be increased. 1.2 site preparation, fertilization fully understand the soil nutrients, soil testing and fertilizer, sowing