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近年来,杂交水稻在生产实践中充分显示出穗大粒多、产量高的优势,亩产多在千斤以上,最高的达1,400斤,一般增产幅度在10～20%.1980年种植面积达到662,000亩.但是,杂交稻纯度高低,直接影响杂交稻的产量,目前有些地区只注意推广,忽视了杂交稻亲本的提纯复壮和繁育工作,有的出现了混杂退化,严重影响杂种的增产作用,乃至失去种用价值.如1978年全省在海南岛配制早丰A×C57组合,因不育系早丰A行中混有保持系早丰B,一般在8～10%,多者达20%以上,因而报废.有的曾用这个杂交种试种,结果减产三分之一.
In recent years, hybrid rice has fully demonstrated the advantages of large grain size and high yield in the practice of producing rice, with more than a thousand kilograms per mu, the highest being 1,400 kilograms, and the general rate of increase being between 10 and 20 percent. In 1980, the cultivated area reached 662,000 mu However, the purity of hybrid rice has a direct impact on the yield of hybrid rice. At present, some areas only pay attention to popularization, neglect the purification, rejuvenation and breeding of hybrid rice parents, and some appear to be mixed and degenerated, which seriously affect the yield increase of hybrids and even lose Such as the province in 1978, Hainan Province, the preparation of early Feng A × C57 combination, because the line of early hybrid HS F HS B HS F, usually in the 8 to 10%, more than 20% of the more , And thus scrapped, and some have used this hybrid seed trial, resulting in one-third reduction in production.