河南省杂交水稻的示范和推广,是从1976年开始的。由于全省稻区情况不同,杂交水稻分为南籼、北粳二片。当时南部以南优2号为主,北部以黎优57为主。南部由于杂交稻优势强,连续两年丰收,当1979年进入大发展阶段时,面积达20余万亩,但在抽穗开花期,遇上43-45℃最高气温,花粉败育严重 Henan Province, hybrid rice demonstration and promotion, from 1976 onwards. Due to the different situation in the province’s rice area, hybrid rice is divided into South indica, North japonica two. At that time, the south south of the best 2, the main north to Liyou 57. Southern hybrid rice has the advantages of strong advantages and bumper harvest for two years in a row. When it entered a large stage of development in 1979, the area reached more than 200,000 mu. However, during the flowering and flowering stage, the highest temperature of 43-45 ℃ was encountered and pollen abortion was serious