由于施肥能使成龄胶树增产,因此多年来已成为胶园的常规措施,但连续多年施肥对胶乳性质会产生什么影响却很少研究。1953年菲尔波特等就曾指出,对种在高度缺钾土壤上的实生胶树结合施用氮、磷、钾肥,浓缩胶乳的稳定性就提高了,但受试验设计的限制,不可能分别研究肥料中各种元素的单独作用。很多研究工作者分析过施肥后的鲜胶乳成分,博菲斯还把这种分析列入作为推荐施肥的“生理诊断”制度中。然而这些研究工作并没有把施肥 Since fertilizers can increase the yield of plastic trees, it has become a routine measure for rubber plantations for many years. However, little has been done on the effects of fertilizers on the properties of latex for many years. In 1953, Philport et al. Pointed out that the stability of concentrated latexes was enhanced by the application of nitrogen, phosphorus and potassium fertilizers to the native gum trees planted in highly potassium deficient soils, but it was impossible to separate them from the limits of experimental design Study the individual roles of various elements in fertilizers. Many researchers have analyzed the composition of fresh latex after fertilization and Boehmess also included this analysis as a “physiological diagnostic” system for recommended fertilization. However, these studies did not fertilize