Irrigation Management and Groundwater Quality

Irrigation management plays a pivotal role in sustaining agricultural productivity while safeguarding underlying aquifers from chemical degradation. As global demand for food rises, large‐scale irrigation schemes have been expanded into semi-arid and arid regions where precipitation recharge is minimal. In such settings, the application of water laden with fertilisers or salts can lead to elevated concentrations of nitrates, dissolved salts and trace elements in the water table. Over time, this process—often termed salinisation—undermines crop yields, accelerates soil degradation and compromises potable water resources. Effective irrigation management seeks to balance applied volumes, timing and methods (for example drip versus sprinkler systems) to reduce deep percolation of agrochemicals, to maintain desired soil moisture without oversaturation, and to preserve the long-term quality of groundwater. Key strategies include precision scheduling based on soil moisture monitoring, autumnal leaching to flush accumulated salts, and the design of drainage networks to intercept return flows. Advances in remote sensing, geochemical modelling and risk mapping have provided new means to predict vulnerable zones and to guide mitigation measures at field and basin scales. The global significance of this research lies in its capacity to inform best practices that reconcile food security with ecosystem health and water security under changing climatic and demographic pressures.

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Irrigation Management and Groundwater Quality publication trend

The graph below shows the total number of articles in irrigation management and groundwater quality across all publications each year (not limited to Nature Index journals).

Technical terms

Irrigation return flow: The portion of applied irrigation water that percolates through the soil profile and recharges groundwater, often carrying dissolved salts and nutrients.

Salinisation: The accumulation of soluble salts in soil or groundwater, typically resulting from evaporation of irrigation water or poor drainage.

Geochemical modelling: Computational simulation of mineral dissolution, precipitation and ion-exchange reactions to predict changes in water chemistry.

Nitrate leaching: Downward movement of nitrate ions through the soil profile into groundwater, driven by excess irrigation or rainfall.

Fuzzy analytic hierarchy process: A decision-support technique combining subjective expert judgments with mathematical weighting to assess vulnerability and risk under uncertainty.

References

1. Geochemical modeling of systems affected by irrigation: The case of Lerma basin (Spain, 2004–2020). The Science of The Total Environment (2023).
2. Introducing a novel approach for assessment of groundwater salinity hazard, vulnerability, and risk in a semiarid region. Ecological Informatics (2024).
3. Assessing irrigation impact on water quality conditions: A case study in the River Noguera Ribagorçana (NE Spain). Agricultural Water Management (2024).