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| DOI：10.13522/j.cnki.ggps.2025170 |
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| Synergistic effects of water-saving irrigation and soil amendment using organic matter on improving soil quality: A review |
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HUANG Jianyi, ZHAO Ying, YANG Fan
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1. School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150038, China;
2. International Cooperation Joint Laboratory of Health in Cold Region Black Soil Habitat of
the Ministry of Education, Harbin 150030, China
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| Abstract: |
| With increasing global water scarcity and widespread soil degradation threatening agricultural productivity and sustainability, there is an urgent need to develop efficient soil and water management practices. Water-saving irrigation techniques have gained increased attention for reducing water consumption while maintaining crop yields. Simultaneously, amending soil with exogenous organic matter has been accepted as a critical strategy for improving soil health and enhancing organic matter content and soil structure. This review explores the synergistic effects of water-saving irrigation and organic amendments on soil improvement, aiming to clarify the mechanisms underlying their positive impacts and highlight their potential applications in sustainable agriculture. We systematically review the efficacy of three main organic materials, straw, biochar and artificial humic substances, in improving soil quality under water-saving irrigation. Amending soil with these organic materials significantly increases soil organic matter, improves soil physicochemical properties, enhances water use efficiency, and mitigates greenhouse gas emissions from soils. We found that straw incorporation alone elevates methane (CH4) emissions under anaerobic conditions. However, when integrated with water-saving irrigation, it improves soil redox conditions, reduces net CH4 emissions, and enhances nitrogen mineralization. Soil amendment with biochar initially immobilizes nitrogen, but its combination with water-saving irrigation can optimize soil moisture content and slowly release nutrient to meet crop demand. This improves nitrogen use efficiency, especially in rice. Artificial humic substances have a minor effect on soil quality under flooded irrigation, but markedly enhance photosynthetic efficiency, carbon assimilation, and soil carbon stability under moderate water stress created by water-saving irrigation. Future research should focus on optimizing the combination of organic matter application and water-saving irrigation, developing precision agronomic practices, and evaluating the efficacy of these practices in areas with diverse climate and soil types in the context of global environmental challenges. |
| Key words: organic materials; water-saving irrigation; soil health; soil improvement |
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