In order to study the spatiotemporal characteristics of soil moisture under restricted infiltration area condition, the indoor soil box
simulation experiment method is chosen to establish mathematical relationship between wetting front migration and time under different drip
irrigation flow rates, and then variational process of wetted soil is analyzed. The results show that restricted infiltration area condition has
significant effect on the shape of wetted soil. The restricted infiltration area condition can effectively reduce the infiltration rate of soil water,
prevent ineffective diffusion and reduce the deep leakage of irrigation water. Compared with the normal condition, the restricted infiltration
area condition can reduce the water infiltration rate by 2.30% to 40.38%. With the same irrigation amount and different irrigation rates, 3 L/h
flow rate not only reduces the evaporation of soil surface water, but also makes wetting front reach the deep layer of soil at the later stage of
irrigation. While compared with 3 L/h flow rate, 4 L/h flow rate reduces the deep leakage of irrigation water. This study further verifies the
rationality of water-saving with cultivation technology of restricted root volume. The results can provide some references for the selection of
drip irrigation flow rate of crops cultivation technology of restricted root volume.
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