Analysis of Characteristics of Soil Moisture Distribution under Water Storage Pit Irrigation with Different Pit Depth

Water storage pit irrigation is a new kind water-saving irrigation method for fruit trees.In order to get a reasonable basis for water storage pit depth determination,the soil water movement test under the condition of water storage pit irrigation with different pit depth is carried out.Two different pit depths,including 40cm and 60cm,are set up in the test,and the vertical and radial distribution characteristics of soil moisture content increments before and after irrigation are analyzed.The results show that under the different pit depth condition,the vertical distribution characteristics of soil moisture content increments is essentially the same and shows a trend of decrease after the first increase.While with the increase of the pit depth,the high soil moisture content increments range is deeper;the radial distribution of soil moisture content increments under the different pit depth condition has no significant difference,the characteristics is that with the water storage pit as center,the soil moisture content increments is larger near the water storage pit and lower far away from it.The study on soil water movement under the condition of water storage pit irrigation with different pit depth will provide theoretical basis for the pit depth selection according to the different fruit trees root moisture absorption environment.