Laboratory experiment on the redistribution of soil salinity under saline and fresh water alternate irrigation

It is an important way to settle the problem of the shortage of fresh water resources by irrigated with saline water at present. In order to seek the rational method of field saline water irrigation, the soil column experiment under saline and fresh water alternate irrigation with different water qualities and different irrigation modes in laboratory was conducted. And the change regularity of electrical conductivity(EC) value and sodium absorption ratio(SAR) were analyzed under the two irrigation modes. Results show that, under two irrigation modes, the EC values of the soil solution reach highest at 22.5 cm as irrigation finished, and 4 g/L>2 g/L. Compared with the initial stage, soil solution EC values increase obviously, the salt accumulats obviously in the soil column wholly. And the irrigation mode has greater influence on EC values than that on the mineralization of irrigation water. The regularity of SAR shows basically the same laws under different mineralization of the two irrigation modes.