The effects of five soil amendments were studied in view of the high salt content and poor hydraulicconductivity in coastal saline soils.Soil moisture

soil salt content

soil pH value

soil bulk density and soilsaturated hydraulic conductivity were analyzed by a field plot experiment in order to select the most suitableamendment to improve the water and salt characteristics in coastal saline soil area.Results are as follows:(1)The change of the soil salt content was greatly influenced by the soil moisture.There was a very remarkably negative linear relationship between the soil salt content and soil moisture.(2)Compared with CK

thesoil salt content was decreased by 29.2%

32.6% and 25.9%at the soil depths of 0-5

5-20and 20-40cm

respectively

after the treatment of humic acid(300kg/hm2)

and the soil bulk density was decreased by10.2%

while the soil porosity and soil saturated hydraulic conductivity increased.(3)The five soil amendments increased crop yield differently

and the effect of humic acid was the best.Corn and rape yields afterthe treatment of humic acid was increased by 104.8% and 41.6%

respectively

as compared with CK.