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1983、1984两年,我们在本县南川乡玉米制种基地,进行了提高产量和质量的制种试验,取得了很好的效果,摸索出了以下几项措施: 1.制种田选地隔离。①选地:莫17和330都是高产自交系,因此应选择地势平坦,土层深厚、土质肥沃、肥力均匀、抗旱防涝、集中连片的地块。②隔离:安全隔离是提高制种田杂交种纯度和质量的主要措施之一。由于莫17是经过纯化了的自交系,对外来花粉非常敏感,一旦发生串花就会使杂种优势下降,影响大田产量,所以必须进行严格隔离,一般应用空间隔离,隔离距离200～300米。当制种区确定后,要向群众宣传,决不允许制种田周围有不符合隔离条件的大田玉米出现。
1983, 1984, two years, we Nanchuan Township, corn production base in the county, to increase the yield and quality of seed trials, and achieved good results, worked out the following measures: 1. System of production sites isolated . ① Selection: Mo17 and 330 are high-yielding inbred lines, so should choose flat, deep soil, fertile soil, fertility uniformity, drought-resistant waterlogging, concentrated contiguous plots. ② Isolation: Safe isolation is one of the main measures to improve the purity and quality of hybrids. Because Mo 17 is a purified inbred line, foreign pollen is very sensitive, once the occurrence of crosses will reduce the heterosis, affecting the field output, it must be strictly isolated, the general application of space isolation, isolation distance of 200 to 300 meters . When the planting area is established, propaganda should be carried out to the masses and it is forbidden to allow the emergence of field corn that does not meet the isolation conditions around the farming system.