Rainwater was collected from the three different sites of Xishuangbanna in 1981 and 1982. The throughfall in two types of Hevea was collected from Jinghong in Jan. 1982 to Apr.1983. The analysis indicated that the amounts of N, P,K,S,Ca and Mg in the incident rainfall were 17.3-19.9, 0.22-0.50, 11.0-15.2, 9.2-27.6, 3.0-18.9 and 6.7-12.3Kg/ha/year respectively.The amounts of these elements in the Hevea throughfall were 15.2-18.1, 1.23-1.44, 16.6 -24.9, 11.0-17.4, 16.6-18.6, and14.0-15.8, Kg/ha/year respectiv...