Research On The Interval-Border Irrigation And Its Mechanism Of Saving Water

The irrigation is the manual technical measure of supplying moisture to crops. At present our country's irrigated area has amounted to 800 million Chinese acres, it provides the guarantee for development of our country's social economy. As a result of historical reason and the limit of economic condition, about 760 million Chinese acres irrigated area (including low-pressure pipeline water distribution) still use the surface irrigation technology. The surface irrigation occupies 95% of the total irrigated area, the border irrigation is the main method in surface irrigation, so there is much importance in researching on the border irrigation water-saving means. Because the invalid consumption of the in-depth leakage and evapo-transpiration, the utilization factor of irrigation water is lower. Water productivity has not reach 1.1 kg/m~3, it is far lower than developed country's 2.0 kg/m~3.For full use the horizontal intergranular suction of soil, reduces the in-depth leakage, water potential difference can be made manually by way of interval-border irrigation. This method can increase horizontal movement and decrease vertical movement of moisture. This method also can supply the adjacent border.The paper has drawn the primary conclusions from the experimentation as following: (1) The production decrease has direct proportion with the width of the interval;(2) Among the four intervals of 1.0m,1.2m,1.4m,1.6m, The yield by per cube-meter water and water productivity are the highest when the interval is 1.0m.In this paper, it was using the advanced model Hydrus-2D to simulate the moisture movement under the interval-border irrigation condition. And the simulated result is compared to the experimental result. The simulated result can satisfy the precision. Especially in the narrow border, simulated result and the experimental result have a good consistency.Simulation results show that, the loam soil is suitable for interval-border irrigation and the sand soil is unsuitable for interval-border irrigation. It has a better effect when...