Irrigation Management and Greenhouse Gas Emissions

Irrigation practices exert a profound influence on the fluxes of key greenhouse gases—carbon dioxide, nitrous oxide and methane—by altering soil moisture regimes, microbial activity and nutrient availability. Traditional flood irrigation often leads to anaerobic microsites that promote methane release, whereas deficit and drip systems can reduce methane emissions but potentially elevate nitrous oxide production through alternating wet–dry cycles. The integration of water‐saving techniques with precise fertiliser delivery has emerged as a means to balance crop water requirements, nutrient supply and minimisation of greenhouse gas outputs. Spatial and temporal control over irrigation not only enhances resource use efficiency and crop yield but also offers routes to mitigate global warming potential at the field scale. Advances in sensor‐based scheduling and subsurface emitter placement are enabling adaptive management that aligns irrigation inputs with plant demand and soil biogeochemical dynamics, thereby contributing to climate‐smart agriculture on a global scale.

Research from Nature Portfolio

Recent studies have demonstrated that substituting flood irrigation with drip fertigation can reduce direct greenhouse gas emissions by around one fifth while increasing water‐use efficiency and soil carbon sequestration. However, the higher infrastructure and operational costs associated with fertigation may require policy support to encourage adoption despite clear environmental benefits. In parallel, combining reduced inorganic nitrogen rates with organic amendments has been shown to lower nitrous oxide emissions by over 40 % while improving nitrogen use efficiency and maintaining grain yield in a wheat–maize rotation. Such findings underscore the potential of integrated water and nutrient management strategies to decouple productivity gains from greenhouse gas intensification.

Irrigation Management and Greenhouse Gas Emissions publication trend

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

Technical terms

Global warming potential (GWP): A relative measure of how much heat a greenhouse gas traps in the atmosphere compared with carbon dioxide over a defined time period.

Fertigation: The practice of delivering fertiliser dissolved in irrigation water to crop root zones to synchronise nutrient supply with plant demand.

Irrigation water‐use efficiency (IWUE): The ratio of crop yield to the volume of water applied through irrigation, indicating the effectiveness of water use.

Drip irrigation: A water‐saving method that delivers small, precise quantities of water directly to the soil at the root interface via emitters.

Nitrous oxide (N₂O): A potent greenhouse gas generated primarily by soil microbial processes of nitrification and denitrification under variable moisture conditions.

References

1. Irrigation and Greenhouse Gas Emissions: A Review of Field-Based Studies. Soil Systems (2020).
2. Mitigation of greenhouse gas emissions through optimized irrigation and nitrogen fertilization in intensively managed wheat–maize production. Scientific Reports (2020).
3. Response of soil N2O emission and nitrogen utilization to organic matter in the wheat and maize rotation system. Scientific Reports (2021).
4. Subsurface Drip Irrigation with Emitters Placed at Suitable Depth Can Mitigate N2O Emissions and Enhance Chinese Cabbage Yield under Greenhouse Cultivation. Agronomy (2022).
5. Soil moisture and water-nitrogen synergy dominate the change of soil carbon stock in farmland. Agricultural Water Management (2023).
6. Nitrogen losses from soil as affected by water and fertilizer management under drip irrigation: Development, hotspots and future perspectives. Agricultural Water Management (2024).