自杂交水稻问世以来,制种技术与制种产量发生了两次大的飞跃,且都是在湖南首先突破。70年代,杂交水稻制种需人工割叶剥苞,费工多,成本高,植伤大,影响到植株的正常发育,导致抗性下降,病害增多,产量很低。 Since the advent of hybrid rice, there have been two big leaps in seed production and seed production, both of which were the first to break through in Hunan. In the 1970s, hybrid rice seed production required artificially cutting leaves and peeling, which required more labor, high cost and large plant damage, which affected the normal development of plants, resulting in decreased resistance, increased disease and low yield.