Experiment and Research on Seepage Effect by Underground Pipe Drainage System of Paddy Field in Saline Soil Coastland

Based on the influence of seepage rate on the dissolved oxygen in ground water, oxidation reduction, electric potential of soil and yields of plant from 3 years' field experiments and researches, this paper put forward the upper controlling index of seepage rate for paddy field in sandy saline soil region by the sea, which is of substantial practical significance to the region in the plan, design operation and management of underground drainage system.