Simulation of Soil Water Movement and Root Uptake under Mulched Drip Irrigation of Greenhouse Tomatoes

Three irrigation treatments were set up in northeast China to investigate soil water movement and root uptake of greenhouse tomatoes, the collected experimental data simulated by HYDRUS-2D. The computation partitioning evapotranspiration into evaporation crop transpiration was carried out with double-crop coefficient method. HYDRUS-2D model successfully movement, producing RMSE ranging from 0.014 0.027, an MRE 0.062 0.126, R2 79% 92%, when comparing simulations two-year field measurements. Under different treatments, 83–90% total quantity concentrated 0–20 cm layer, more deficit, deeper roots will absorb compensate for lack at surface. average area shortage W1 2.08 times that W2. W3 treatment hardly suffered stress. In model, parameter n had highest sensitivity compared parameters α Ks, ranking > Ks α. This research revealed relationships between soil, under drip analysis could guide key adjustment improve simulation efficiency model.