Effects of Different Amendments on Water and Salt Characteristics of Coastal Saline Soil

The effects of five soil amendments were studied in view of the high salt content and poor hydraulic conductivity in coastal saline soils.Soil moisture,soil salt content,soil pH value,soil bulk density and soil saturated hydraulic conductivity were analyzed by a field plot experiment in order to select the most suitable amendment 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,the soil salt content was decreased by 29.2%,32.6% and 25.9% at the soil depths of 0—5,5—20 and 20—40 cm,respectively,after the treatment of humic acid(300 kg/hm2),and the soil bulk density was decreased by 10.2%,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 after the treatment of humic acid was increased by 104.8% and 41.6%,respectively,as compared with CK.