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1 制种地的选择选耕层深厚、土质疏松、排灌良好的地块。严格选择空间隔离200～300m 以上的开阔通风地带,在此区域内严禁种植葫芦科作物及马铃薯、棉花等。前茬作物应选小麦、豆类等,并连续3a 未种植过瓜类、蔬菜的地块,严禁同类作物连作、套作或种在枣树等果树下。
1 system of choice of the choice of deep plowing, loose soil, irrigation and drainage of good plots. Strictly select the open space of more than 200 ~ 300m for the space isolation. Cucurbitaceous crops, potatoes and cotton are strictly forbidden in this area. Crops before the crop should be selected wheat, beans, etc., and has not been planted 3a consecutive melons, vegetables plots, continuous cropping of similar crops, intercropping or planted in fruit trees such as jujube.