Experiment study on impact from soil initial water content on water movement distribution characteristics of soil under injection irrigation

Through the indoor infiltration experiment of injection irrigation made on various soil initial water contents,the impact from the soil initial water content on water movement distribution characteristics of soil under injection irrigation is studied herein.The study shows that a power function relationship lies between the cumulative infiltration of the injection irrigation and the time,i.e.the larger the initial water content is,the bigger the cumulative infiltration in a same infiltration time will be.The wetting range of the soil under the outlet is larger with a larger water content,but it is reversed above the outlet.The larger soil water content is,the larger soil wetting range and then the larger the water content of the soil with the same distance to the outlet will be.The study made herein can provide a basis for the further supplement of theory and technology of the injection irrigation.