Infiltration rate values of the soils with different gypsum content were evaluated based on the number of irrigation tests and application rates (Fig. 4). There were no significant difference (P > 0.05) in average infiltration rate except on the soils with 60 and 275.2 g kg−1 gypsum content under the low application rate (R3000 orangeplate sprinkler). Generally, the infiltration rate values of the soils irrigated with high sprinkler application rate (R3000 red-plate sprinkler) were lower than that of soils irrigated with low sprinkler application rate (R3000 orange-plate sprinkler). This could be ascribed to the low organic matter content (