Summary
This meta-analysis evaluated the effectiveness of water conservation methods in ameliorating saline–alkali soils across China, a substantial constraint on crop production. The analysis found that mulched and conventional drip irrigation, as well as flood irrigation with drainage, were most effective at reducing soil salinity and alkalinity whilst increasing crop yields, though saline irrigation presented risks of secondary salinization. The impoundment method was identified as a particularly effective alternative, achieving substantial reductions in soil salt content and pH.
Regional applicability
This study focuses on saline–alkali soils in China and may have limited direct applicability to United Kingdom farming, where such soil constraints are not widespread. However, the methodological approach and comparative efficacy of different irrigation and water management techniques could inform UK research on soil amelioration in affected regions (e.g. coastal areas with salt intrusion) or on optimal water conservation strategies for sustainable agriculture.
Key measures
Soil electrical conductivity (EC), soil salt content (SSC), soil pH, sodium adsorption ratio (SAR), soil nutrient content, crop yield, percentage changes in each metric
Outcomes reported
The meta-analysis quantified effects of water conservation methods (drip irrigation, flood irrigation, with or without drainage) on soil salinity, alkalinity, nutrient content, and crop yield in saline–alkali soils. Key outcomes included reductions in electrical conductivity, salt content, pH, and sodium adsorption ratio, alongside increases in soil nutrient content and crop yield.
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