位于三角洲河网地区的沙围田和沿河两岸的低洼洋田,灌溉条件好,土壤肥力高,地势平坦,耕作方便,增产潜力很大。但这些田有的处于河网地带或地势较低,田间地下水位常处于较高的状态,对水稻产量影响甚大,以至成为粮食增产的突出矛盾。因此,研究降低这些田类的地下水位以达到改良土壤,提高产量有现实意义。 Sandy fields located in the delta area of ​​the delta and low field fields along the banks of the river have good irrigation conditions, high soil fertility, flat topography, convenient farming and great yield potential. However, some of these fields are located in the river network or have low topography, and the groundwater table in the field is often in a high state, which has a great impact on the output of rice and has even become a prominent contradiction in the increase of grain output. Therefore, it is of practical significance to study and reduce the water table of these fields to improve the soil and increase the yield.