Experimental study on water and salt transport in saline soils under the action of amendments
In order to study the effects of different amendments on water and salt transport in saline soil under drip irrigation conditions,this study used an indoor infiltration test with dual-point source soil column to investigate the change of the moisture peak in the soil column and the transport of wa-ter and salt within the wetting body under the conditions of different amendments with the same drip head flow rate(0.3 L/h).The results of the study showed that the addition of amendments had a sig-nificant effect on water infiltration reduction,especially in the soil treated with humic acid at an appli-cation rate of 1.0 g/kg,the deepest point that vertical wetting front reached is about 11 cm from the surface,which was 9 cm smaller than that of the control group without amendments.The amend-ments significantly increased the average volumetric water content and desalination rate of the wetting body.Compared with the control group,the average volumetric water content of soil moisture in-creased by 28%and the desalination rate increased by 20%when treated with humic acid at a dosage of 1.0 g/kg,while the average volumetric water content of the soil treated with 1.0 g/kg of biological bacteria increased by 4%and desalination rate increased by 15.1%.Under the same drip flow rate,although the average volumetric water content and the desalination rate of the soil wetted body treated with humic acid at 1.0 g/kg was the highest,the wetted body was the smallest,the range of desalina-tion was the smallest,and surface ponding occurred,which resulted in a waste of water.In summary,the soil amended with 1.0 g/kg of biofungus is more suitable for planting oil sunflower,corn and oth-er drought-tolerant crops with deep roots in Nanliang Farm,Ningxia.
saline soilsdual-point source infiltrationwater and salt transportwetted bodies
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NSTL
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