果园周围不宜栽的树葡萄园周围不能栽榆树。榆树的分泌物对葡萄有抑制作用，如榆树栽得离葡萄近了，凡榆树根扎到的地方，葡萄结果少或不结果甚至死树。苹果园、梨园、李园四周不宜栽刺槐。刺槐分泌的鞣酸类物质可显著地抑制苹果、梨、李等多种果树的生长发育，影响结果。... Trees around the orchard should not be planted Elm trees around the vineyard. Ulmus secretion inhibit the grapes, such as the Elm planted near the grape, where Elm root bar to where the grapes with little or no result or dead tree. Apple orchard, Liyuan, Li Park, not suitable for planting black locust. Black locust tannic acid substances can significantly inhibit the growth of apple, pear, plum and other fruit trees, affecting the results. ...