我国果树发展方针是“果树上山下滩,不与粮棉争地”。因此,果园土壤的立地条件比较差,山地土壤瘠薄、土层浅、水土流失重;滩地风沙大,或有涝洼盐碱为害。加以果园长期缺肥,忽视树下管理,致使不少果园幼树不能适龄结果,结果后产量低,大小年幅度大,品质差、果树表现早衰。 Our fruit tree development policy is “fruit trees down the beach, not competing with grain and cotton.” Therefore, the orchard soil site conditions are relatively poor, barren mountain soil, shallow soil, heavy soil erosion; beach sand blown, or waterlogging salina damage. Long-term lack of fertility to the orchards, tree management ignored the tree, resulting in many young orchard can not age results, the results after the low yield, the size of the annual rate of large, poor quality, premature failure of fruit trees.