随着双三熟制的发展,上海郊区土壤淹水时间延长,造成土壤水、气矛盾尖锐,根系生长环境不良,尤以松江、青浦、金山低洼地区更为突出。这是高产更高产所必须解决的重要课题。暗管排水可以人为控制地下水位,增加稻田渗漏量,从而达到改善土壤环境,增强根系活力和吸肥能力。这是低洼地区水稻土争取穗多、穗大、减少瘪谷、夺取高产的重要措施,也是治水改土、低产变高产的有效途径。 With the development of Shuangsanghupian, the submergence of soil in Shanghai suburbs prolonged, resulting in sharp contradictions of soil water and gas and poor root growth environment, especially in the lowland areas of Songjiang, Qingpu and Jinshan. This is an important issue that must be solved if the production of higher yield and higher yield. Underground pipe drainage can artificially control the groundwater level, increase the amount of leakage in paddy fields, so as to achieve the improvement of soil environment, enhance root activity and fat absorption capacity. This is an important measure for paddy rice in the low-lying areas to gain more spikes, bigger ears, reduce the flattened valleys and seize high yields. It is also an effective way to control water and improve soil fertility and low yield and high yield.