脐橙为柑桔果树中的良种,在国内外市场上均具重大经济价值,故被列为四川省发展柑桔良种之一。目前,国内栽培脐橙以四川省最多,栽培面积较大,多集中在重庆、永川、简阳、金堂一带。就重庆而言,就有一个生产队栽种四千余株的,但因落果现象严重,形成低产甚至无产,因此,如何防止脐橙落果,提高产量,为生产上极待解决的问题。1972年我院 Navel orange is a kind of citrus fruit trees, both in the domestic and foreign markets have significant economic value, it is classified as one of the development of citrus varieties in Sichuan Province. At present, the most cultivated navel oranges in Sichuan Province, cultivation area larger, mostly concentrated in Chongqing, Yongchuan, Jianyang, Jintang area. In the case of Chongqing, one production team planted more than 4,000 plants. However, due to serious fruit drop-offs, low-yielding or even unproductive products were produced by production teams. Therefore, how to prevent navel oranges from falling out and increase yields is a problem that needs to be solved urgently in production. 1972 our hospital