This experiment adopted multilevel combinatory design of five f ac tors,modelling irrigated4~5g/L brackish water from1through20years.The results are as follews:the salt in0~5cm and surface soil is higher than that of other layers,the soil salt is more than0.200%generally.The salt in t he soil layer of20~40cm is the lightest,and the salt in siol layer of40 ~60cm is among that of0~5cm and5~20cm or20~40cm.The effect of he ulandite as calcareous soil amendment agent is the best,the soil salt decline d0.011%~0.0...