为探索高效复合化肥——磷酸二氢钾对果树的增产效果,我们于一九八一年在海渤湾农场十队果园对二二○株国光苹果树采取叶面喷肥的方法进行了试验,效果比较明显。试验用西安市产的磷酸二氨钾。7月初,在果实有山楂大小时,以千分之三的浓度进行喷洒。叶面喷施磷酸二氢钾后,果树表现为叶片厚实,浓绿,早期生理落果率为百分之五,而对照高达百分之十五,采前落果率也明显下降,仅 In order to explore the effect of compound fertilizer - potassium dihydrogen phosphate on the yield increase of fruit trees, we tested the application of foliar fertilizer to 220 Guoqiang apple trees in 1981 in Orchard Park, , The effect is more obvious. Test with Xi’an produced potassium dihydrogen phosphate. In early July, when the fruit has the hawthorn size, it is sprayed at a concentration of three-thousandths. Foliar application of potassium dihydrogen phosphate, fruit trees showed thick leaves, dark green, the early physiological drop fruit rate of 5%, while the control up to 15%, the deciduous fruit rate also decreased significantly, only