在北京农学院园艺系副教授李延生先生指导下,1983年我们在葡萄、红果、柿子上试用防落素,增产效果较明显。它的作用主要是在果实速长期喷后,可迫使营养生长暂缓,促使果实生长加速,产量增加。为进一步证实增产效果,1984年在永定乡小园村一块已定植20余年的老葡萄园里,做了 Under the guidance of Mr. Li Yansheng, an associate professor of horticulture at Beijing Agricultural College, in 1983, we experimented with anti-down factors on grapes, red fruits and persimmons, and the effect of increasing yield was obvious. Its role is mainly in the fruit after the long-term spray, can force the suspension of vegetative growth, prompting the fruit growth accelerated, yield increased. In order to further confirm the effect of increasing yield, in 1984, Yongding Township, a small village has been planted in more than 20 years old vineyard, did