西瓜是雌雄同株异花授粉作物,良繁生产种子过程中极易串花混杂,造成品种混杂、变异、退化。80年代初,我市种植华东24和开始推广苏蜜1号时,西瓜提纯复壮方法是用混合选择法,即在留种田内选择单瓜,经考种中选的单瓜,下年混合繁殖。这种方法还不能很好解决品种混杂退化问题。1981年开始试种 Watermelon is hermaphrodite cross-pollination crops, easy propagation of seeds in the process of easy flowering mixed flowers, resulting in hybrids, variation, degradation. In the early 1980s, when the city planted East China 24 and started to promote Su-1, the watermelon purification and rejuvenation method is a hybrid selection method, that is, choosing a single melon in the remaining farming field and mixing the single melon in the next year. This method is not yet a good solution to the problem of hybrid degeneration. 1981 trial planting