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| Effects of saline water with different cations on soil hydraulic properties and lettuce growth |
| QIAO Ruonan1,2, CHENG Yu1,2, YAN Sihui1,2, LUO Min1,2, WANG Chun1,2,ZHANG Tonggang1,2, ZHANG Tibin1,3* |
| 1. Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China; 2. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China; 3. Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China |
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Abstract In order to explore the effects of different saline water quality on soil hydraulic properties and crop growth, a two-season pot experiment was carried out for cropping lettuce in the solar greenhouse. Taking the saturated solution of CaSO4 as the control(CK), different chlorides were added to deionized water to form three saline water treatments with different cationic compositions(Na+∶ TNa; Na+/K+ of 1∶1: TNa-K; K+∶TK)but the same electrical conductivity. The soil bulk density, water holding properties, water and salt transport, and lettuce growth were studied. The van Genuchten model was used to fit and analyze the soil water characteristic curve and the relevant parameters. The results showed that compared with CK, saline water irrigation increased soil bulk density and reduced soil porosity. With the continuous irrigation of saline water, soil pore size distribution was significantly altered, and more micropores were formed, resulting in the improved water-holding capacity of soils. The most significant effect was observed in TNa. Both the sodium absorption ratio(SAR)and cation ratio of soil structural stability(CROSS)showed negative correlations with the soil entry value parameters(α)(both R2=0.78). Compared with SAR, CROSS could better reflect the potential changes in soil physical properties caused by the changes in ionic compositions of irrigation water. After continuous irrigation with saline water, soil salt accumulated gradually, which was indicated by the electrical conductivity of saturated extract(ECe)of soil at 0-20 cm depth at the end of the second season(80 days after sowing)was significantly higher than that in the first season. The ECe of CK was significantly lower than those of other treatments(P<0.05). Salt accumulation was more evident in the surface soil layer(0-10 cm). The soil moisture content in surface layer was higher at the end of the growing season, which is basically consistent with the salt distribution. Compared with CK, TNa, TNa-K and TK treatments significantly reduced lettuce growth(P<0.05), where the TNa gave the lowest biomass.
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Received: 03 November 2021
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WANG Yu,LIU Chuncheng-*,LI Renjie,ZENG Zhi,CUI Bingjian,ZHANG Fenghua,YAN Mingli,HU Chao,MA Tian,. Response and evaluation of soil enzyme activity to drip irrigation with brackish water and reclaimed water[J]. Journal of Drainage and Irrigation Machinery Engin, 2023, 41(3): 313-318. |
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