1严格隔离，适时播种1.1制种田的隔离制种田需严格隔离，隔离距离不小于500m。1.2适时播种育苗或直播，父本比母本提早播种7～10d。呼和浩特地区育苗的适宜播期为4月25日左右，直播的适期为5月1日左右。1.3父母本比例及定植密度父母本比例为1∶5左右。主枝型的定植密度为3400株 A strict isolation, timely sowing 1.1 farming system of isolation farming to be strictly isolated, isolation distance of not less than 500m. 1.2 timely sowing seedlings or live, sow than sow early sowing 7 ~ 10d. The appropriate sowing date for sowing in Hohhot is around April 25, and the live broadcast period is around May 1. 1.3 The proportion of parents and planting density The proportion of parents is about 1: 5. Main branch colonization density of 3400 plants