对苹果树磷素功能,国内外都进行了大量的研究,并取得一定成果。但对苹果磷素诊断指标、适宜用量试验结果差异很大,在生产中很难应用。为找出适用于我省具体条件的磷素营养诊断指标,确定台理的磷肥施用量,做到合理施肥,提高经济效益,我所从1980～1984年进行了该项研究。并已推广施用磷肥面积100多万亩,果树2000余万株。试验已达到预期目的,并取得较大的经济效益。一、材料和方法所内外各试验点均按统一方案进行。试验设5个处理(见表1)。 Phosphorus function of apple tree, both at home and abroad have carried out a large number of studies, and achieved some results. However, for apple phosphorus diagnostic indicators, the appropriate amount of test results vary widely, difficult to apply in the production. In order to find out the index of phosphorus nutrition which is suitable for the specific conditions of our province, to determine the application rate of phosphorus fertilizer in Taiwan, so as to make reasonable fertilization and increase the economic benefits, we conducted this research from 1980 to 1984. And has been promoting the use of more than 100 acres of phosphate fertilizer area, more than 20 million trees. The test has reached the expected purpose, and achieved greater economic benefits. First, materials and methods The test points inside and outside the unified program. Experiment set up five treatments (see Table 1).