论文部分内容阅读
我国节水灌溉农业取得了较大进展,但是目前节水灌溉还存在以下问题:许多灌区只修建了干、支渠骨干工程,田间灌排工程不配套,土地不平整;工程老化失修,效益衰减;灌溉技术落后,大水漫灌,水利用率低;城市生活、工业污水无序排放,许多地方水资源受到严重污染;管理混乱,缺乏鼓励农业合理、高效用水的机制和调控手段;农民经济实力差,节水投入少,使我
Water-saving irrigation in China has made great progress, but the following problems exist in water-saving irrigation at present: Only a few dry and branch canal projects have been built in many irrigated areas; the irrigation and drainage projects in the irrigated area are not complete and the land is not smooth; Irrigation technology is backward, flood irrigation is widespread, and water utilization rate is low; urban life and industrial wastewater are discharged disorderly, leading to serious pollution of water resources in many places; disorderly management and lack of mechanisms and regulatory instruments to encourage rational and efficient use of water in agriculture; poor economic performance of peasants Water-saving inputs make me