Abstract In this paper, effects of irrigation intervals and salinity on water infiltration dynamics and salt distribution in the silty loam from the Yellow River Delta were investigated. Laboratory simulation experiments were conducted on soil columns and the cumulative infiltration, infiltration duration and water-salt distribution in the soil were monitored in twelve irrigation treatments in terms of four irrigation intervals(0, 30, 60 and 90 min)and three salinity levels(3, 6 and 9 g/L). The results showed that the duration of water infiltration became longer significantly with increasing irrigation interval in the same amount of infiltration. There was no statistically significant difference in the mean soil water content between the alternate irrigations with salty water in 3, 6 and 9 g/L salinity respectively. However, the mean soil salt content in the irrigation treatment with 3 g/L salinity was lower than that in the irrigation treatments with 6 and 9 g/L salinity; further, the mean soil salt content in the treatments with 90min irrigation interval was much lower than the treatments with the other irrigation intervals. Overall, the alternate irrigation with salty water in 3 g/L salinity and a longer interval is beneficial to reducing soil salt content in the studied region.
ZHU Jinjin,SUN Junna,ZHANG Zhenhua*等. Response of water-salt migration to salty and fresh water alternate irrigations in silty loam[J]. Journal of Drainage and Irrigation Machinery Engin, 2020, 38(3): 298-303.