杂种优势是生物界比较普遍的现象。在主要作物中,玉米、高粱杂交种用于生产较早,近年来,水稻杂交种也首先在我国推广应用。由于杂交种的推广利用,使农作物产量大幅度增长,为我国社会主义建设做出了贡献。棉花杂种一代优势也很显著,一般可增产30%左右,这一事实早被人们所认识,但因制种困难,限制了它在生产上的推广应用。国内外正从三系配套、化学杀雄、指示性状、昆虫传粉、人工去雄授粉等几个方面进行研究,直到目前尚未取得重大突破。我省棉花杂种优势利用的研究从1972年开始。我们设想了用人工去雄授粉制种法,在生产上应用其一、二代的途径,因为棉花 Heterosis is a more common phenomenon in the biological world. Among the main crops, maize and sorghum hybrids are used for production earlier. In recent years, rice hybrids have also been popularized and applied in China. Due to the popularization and utilization of hybrids, the output of crops has increased substantially, contributing to the socialist construction of our country. The advantage of cotton hybrid generation is also very significant, generally increase yield by 30% or so, this fact has long been known, but because of seed production difficulties, limiting its promotion and application in production. At home and abroad are from the three lines supporting, chemical killing male, indicating traits, insect pollination, artificial to male pollination and other aspects of research, until now have not made a major breakthrough. The utilization of cotton heterosis in our province began in 1972. We envisaged the use of artificial male to pollination seed production method, its application in the production of one or two ways, because cotton