Effect of straw mulching on water-salt dynamic of saline soil

The variable law of saline soil evaporation,water content and salt content was studied in the straw mulching condition.The results showed: after straw mulching,the saline soil evaporation is lower than control experiment,with increasing of straw mulching content,soil evaporation is decreased,when straw mulching content is 0.75 kg/m2,the decrease range of day evaporation is changed mildly.Compared with the control experiment,when the straw mulching content is 1.05 kg/m2(C4),0.75 kg/m2(C3),0.45 kg/m2(C2),0.15 kg/m2(C1),inhibition rate of soil evaporation is 80.54%、79.01%、62.45%、37.93%,respectively.With increasing of straw mulching content,water content of different soil layers is increased in the different growth stages,when straw mulching content is 0.75 kg/m2,water content of different soil layers is best.Based on the monitoring results of the whole growth period,treatment of different straw mulching content can inhibite salt accumulation,when straw mulching content is 0.75 kg/m2,decreasing effect of salt content of different soil layers is best.Salt content inhibition of 0~10 cm soil layer is strongest,decreasing trend of salt content is maximum.Therefore,straw mulching soil surface is improved saline soil,reduced soil water evaporation loss,improved water use efficiency,inhibited surface accumulation of the salt,improved the utilization of arable land.