Simulation of Soil Water and Salt Balance in Three Water-Saving Irrigation Technologies with HYDRUS-2D

Mulch drip irrigation (MDI) technology can effectively solve the problem of insufficient temperature accumulation during pre-fertility period and facilitate efficient supplementation water fertilizer fertility in spring corn planting. Moreover, this local MDI also has impacts on farmland environment. To investigate effect salt environment farmland, a field study cultivation was carried out at West Liaohe Plain. In addition, dynamics were simulated using HYDRUS-2D for mulch (MDI), shallowly buried (SBDI), sprinkler (SI), with variable rainfall initial content. The results showed that distribution variation soil similar under SBDI. change near tape mainly affected by irrigation, while between tapes correlated rainfall. amount topsoil (5 cm) increased decrease With an EC = 480 ?s/cm (soil content 0.1%), salinity significantly higher than SBDI SI within two years. all three technologies increasing operating life, reaching relatively stable state, much lower determination threshold ?s/cm. Given current conditions rainfall, soil, depth, mineralization Plain, risk secondary salinization is minimal if management reasonable. This provides data to support application Western