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1985年在安徽淮北平原的涡阳县苗圃、西阳苗圃、涡阳县林科所选择二年生当地乡土树种泡桐(平茬)、苦楝、臭椿(平茬)及引进树种72杨(平茬)和常绿1—3年生侧柏、1年生女贞作供试树种,采用河南省商丘化工厂生产的农用稀土(农乐),以5/万、10/万、20/万、40/万四个浓度喷施,每个树种施用3个浓度,随机排列,两个重复。为了避免金属可能与稀土元素起化学变化,保证试验精度,喷施使用塑料喷雾器,用无污染的河水
In 1985, the native trees Paulownia (stubble), Melia azedarach, Ailanthus altissima (stubble) and the introduction of tree species 72 Yang (stubble) were selected in Guoyang County Nursery, Xiyang Nursery and Guoyang County Forestry Branch of the Huaibei Plain in Anhui Province. Evergreen 1-3 year-old Platycladus orientalis and 1-year-old virginia were taken as test species. Agricultural rare earth (Nongle) produced by Shangqiu Chemical Plant in Henan Province was used for planting of 5 / 10,000, 10 / Spraying at a concentration of 3 concentrations for each tree species, randomized, two replicates. In order to avoid the metal may react chemically with the rare earth elements, to ensure the accuracy of the test, spraying the use of plastic sprayers, non-polluting river water