Research on salt movement law in jujube root zone under indirect subsurface drip irrigation

In order to study transport and distribution characteristics of soil salinity under indirect subsurface drip irrigation, a field experiment was designed to analyze salt distribution characteristics and the effect of water-conducting device diameter (50, 75, 90 mm) and irrigation quantity (9, 13, 17 L/plant per time) on salt transportation in jujube root zone under indirect subsurface drip irrigation. The results showed that soil salt content of 10~40 cm soil layer was relatively low, and soil salt content of 0~10 cm soil layer was the highest in vertical direction, while soil salt content of each soil layer showed a increasing trend with the increase of distance from the outlet in horizontal direction under treatments after a period of time. After a single irrigation, desalination rate of each soil layer increased with the increase of irrigation quantity under a certain water-conducting device diameter. Desalination rate decreased with the increase of water-conducting device diameter in 10~40 cm soil layer under a certain irrigation quantity, while desalination rates in 0~10 cm and 40~50 cm soil layer had a trend of low-high-low with the increase of water-conducting device diameter. Soil salt content in 0~50 cm soil layer was relatively low when water-conducting device diameter was 75mm, irrigation quantity was respectively 13 and 17 L/plant from July to September, while soil salt content varied little. As a result, water-conducting device diameter was 75 mm, and irrigation quantity was 13 L/pant, which was the suitable treatment that determined with consideration of the factors of water-saving and restraining salt. The research results had a theoretical support for the water-salt regulation and reasonable irrigation schedule in jujube field in southern Xinjiang. ©, 2014, Chinese Society of Agricultural Machinery. All right reserved.