Implement Of Water Saving Irrigation In Paddy Field By Diving Interception Tests

China is a country short of water resources, by the United Nations as one of the13 reduction water. With the rapid development of China's economy, water resources have become the economic and social development important restriction factor. Agriculture is the largest water users in China, dominated by traditional irrigation; water use efficiency is low,serious waste of water resources. In the grim situation of shortage of water resources, develop water-saving irrigation technology, improve the utilization rate of irrigation water, to alleviate the water shortage crisis, guarantee food security and achieving sustainable development, is of great significance.This paper summarizes the domestic and foreign water-saving agricultural technique innovation based on the results, the first chosen to realize the water-saving irrigation water groundwater brake control method.Through taking held diving mode and normal irrigation modes of irrigation water efficiency and effectiveness indicators of comparative test found, building underground water gate to improve obstruct critical water levels high, effectively blocking the loss of diving underground, reducing the amount of irrigation water for paddy field water levels up to 27.7%,surpassing the target project is expected to save water.Through monitoring and analysis change law of hydrodynamic field and chemical field on retaining condition, critical banked-up water level leds to groundwater PH value increased, conductivity reduced, in existing irrigation system and irrigation technology conditions, the crops are likely to produce a certain degree of adverse effects; underground banked-up water level makes the various soluble material concentration in groundwater increased, but monitoring and analysis show that banked-up water level didn't have obvious influence on main surface source pollutants TN, and TP, and CODcr concentration.This study provides a new way for further utilization of underground water gate to reduce the surface source pollution from the underground.