上海郊区雨量充沛,年降雨量1143毫米左右,三麦期间(11～5月)近500毫米,约占全年降雨量的40%,加上地下水位高,常易造成渍害.双季稻三熟制发展后,土壤耕层滞水使渍害有所强化,多雨少雨年份单产悬殊.因此,排水治渍就成为水稻土旱作高产稳产急待解决的重要问题.现将我们在1976～1980年内对这一问题进行试验研究的结果介绍如下. Rainfall in the suburbs of Shanghai is plentiful with an annual rainfall of about 1143 millimeters. Nearly 500 millimeters of rainfall during the three wheat rains (about 11-5 months), accounting for about 40% of the annual rainfall, together with high groundwater levels, often cause waterlogging. After the development of the three-cropping system, the stagnant water in the soil plow has strengthened the waterlogging and the poor yield in the rainy and no rainy years, therefore, the treatment of the drainage water has become an urgent issue to be solved in the paddy soil dryland. Now, The results of the pilot study on this issue in 1980 are described below.