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| Effect of salinities and sodium adsorption ratio of irrigation water on infiltration and distribution of water and salt under gravel-sand mulching |
| DONG Lixia1, TAN Junli1,2,3, LI Miao1, LI Cunyun1, WANG Xina4 |
| 1. School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, Ningxia 750021, China; 2. Engineering Technology Research Center of Water-Saving and Water Resource Regulation in Ningxia, Yinchuan, Ningxia 750021, China; 3. Engineering Research Center for Efficient Utilization of Modern Agricultural Water Resources in Arid Regions, Ministry of Education, Yinchuan, Ningxia 750021, China; 4. College of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China |
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Abstract A series of soil column experiments were carried out to investigate the effects of salinities and sodium adsorption ratios of irrigation water on soil water infiltration process and the distribution of soil moisture and salt under gravel-sand mulching. Treatments included 4 salinities of irrigation water(1.0, 2.5, 5.0 and 7.5 dS/m)with CK of deionized water(EC=0 dS/m)and 4 sodium adsorption ratios(SAR=3.9, 7.0, 12.7, 22.7(mmol/L)0.5). Results showed that the cumulative wetting front was improved and the cumulative infiltration volume decreased as salinity of irrigation water increased. Compared with deionized water(EC=0 dS/m), the cumulative wetting front increased by 7.0%, and the average soil moisture content decreased by 36.0% with irrigation water salinity of 7.5 ds/m. The cumulative wetting front and cumulative infiltration volume increased first and then decreased with the increase of SAR of irrigation water and the influence of SAR of irrigation water on soil moisture in the profile was little. Salt content in the upper soil increased with the increase of salinity of irrigation water as a positive power function, while there was no obvious relationship between soil salt content and SAR of irrigation water. Soil pH was improved greatly with the increase of SAR of irrigation water.
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Received: 08 August 2021
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