EF植物生长促进剂是中国林科院林化所与广东省雷州林业局共同研制成的一种新产品。它是从桉树叶中提取的以黄酮类为主的化合物。几年来,经十多个研究所和应用单位在农业、园艺和林业上二十多个品种的应用试验,证明EF具有下列特点:1.增强光合作用,增加干物质积累。在白菜类上经三年多应用,植株叶片中叶绿素含量增加42—70％、产量增加8—24％;在黄瓜上应用能促进雌花早现、早育,增产21—50％;在葡萄上经三年的应用,能促进花芽分化提高座果率,糖度 EF plant growth promoter is a new product developed jointly by Forestry Research Institute of Forestry of China and Leizhou Forestry Bureau of Guangdong Province. It is a flavonoid-based compound extracted from eucalyptus leaves. Over the past few years, more than a dozen research institutes and application units in agriculture, horticulture and forestry, more than 20 varieties of application tests have proved that EF has the following characteristics: 1. To enhance photosynthesis and increase dry matter accumulation. After more than three years of application on cabbage, chlorophyll content in plant leaves increased by 42-70% and yield increased by 8-24%. Application on cucumber could promote early emergence and early maturity of female flowers by 21-50% Three years of application, can promote flower bud differentiation to improve fruit rate, sugar content