Abstract: The field experiment of summer sowing soybean [Glycine max （L.） Merr.] was conducted in the moderate saline-alkali soil area of Huanghua City, Hebei Province. Four treatments, namely flat sowing （control treatment）, flat sowing with plastic film mulching, ridging planting, and ridging planting with plastic film mulching, were set up to study the effects of ridge planting and film mulching on soil water and salt transport and soybean yield. The results showed that compared with the traditional flat sowing, flat sowing with plastic film mulching had no significant effect on soil water and salt transport and soybean yield, while ridge planting could significantly change soil water and salt distribution. When the rainfall began to decrease in the middle and late stages of soybean growth, in ridge planting and planting the furrow would produce the effect of superimposed rainwater harvesting, significantly increase the soil water content of 0~20 cm and 20~40 cm in the middle stages of soybean growth, slowe down the process of returning salt to the surface layer at the late growth stage, effectively reduced the salt content in the surface layer of soil, promote the growth and yield of soybean to a certain extent, and increase the yield by 27.2%. The effect of ridge planting with plastic film mulching was similar to that in ridge planting, and the effect of plastic film mulching was not significant in this experiment. The research showed that ridge planting technology could be used as one of the important agricultural measures for summer soybean planting in coastal saline-alkali soil.

Key words: saline-alkali soil, soybean[Glycine max （L.） Merr.], ridge cropping, film mulching, water and salt transport, yield