粳稻三系在我省于一九七五年配套以后,经两年杂种试种,已表现出明显的产量优势,一般可增产20%左右,已日渐在生产上推广应用。二年来,省内已配套应用的几个组合,还有许多不足之处,如恢复系的抗病能力较差,抗低温能力弱,不实率高等,由此而影响到杂种的抗性也较差,不实率也较高等。同时也发现在大面积的不育系繁殖和制种的过程中,由于多方面因素 Japonica rice system in our province after supporting in 1975, after two years of hybrid trials, has shown obvious yield advantages, generally increase about 20%, has been gradually applied in the production. In the past two years, there have been many deficiencies in several combinations that have already been applied in the province. For example, the resistance of the restorer system is poor, the ability of resistance to low temperature is weak, and the false detection rate is high, thereby affecting the resistance of hybrids Poor, not real rate is higher. Also found that in a large area of ​​CMS breeding and seed production process, due to many factors