山东省五莲县园艺场属山地梯田果园,苹果系1958年定植,共550亩13000株,主栽品种为国光、青香蕉和金冠。由于活土层仅15～20cm,有机质含量在0.4～0.6%之间;加之管理水平较低,结果后,树势日趋衰弱,腐烂病发病株率达90%以上;每年7～8月份落叶率达40%以上,病虫果率达8%;大小年严重 Wulian County, Shandong Province is a horticultural field terraced fields orchards, apples were planted in 1958, a total of 550 acres of 13000 strains, the main cultivars Guoguang, Green Banana and Golden Delicious. Due to the soil layer is only 15 ~ 20cm, organic matter content between 0.4 ~ 0.6%; combined with the management level is low, the results of the growing weakening of the tree, the rot disease incidence rate of more than 90%; annual July to August deciduous rate Up to 40%, disease and insect fruit rate of 8%; the size of the year serious