Water Management Strategies in Semi-Arid Agriculture

Strategies to mitigate water scarcity in semi-arid agricultural systems encompass a diverse array of ecological, engineering and agronomic approaches. Rainwater harvesting techniques—both in situ and ex situ—capture and store precipitation at field scale, while structures such as half-moons, zaï pits, stone bunds and contour ridges slow runoff, enhance infiltration and bolster soil moisture retention. Complementary measures include minimum tillage with surface mulching and the creation of tied ridges to reduce erosion and improve water distribution in sandy or degraded soils. Integrated soil fertility management, notably the combined application of high-quality organic matter and mineral fertilisers, optimises nutrient uptake and augments soil organic carbon, thereby enhancing resilience to erratic rainfall. Advances in remote sensing and cropping simulations enable large-scale monitoring of vegetation response, validating field-level interventions and informing adaptive strategies. Together, these approaches align with the pillars of climate-smart agriculture—productivity, resilience and mitigation—offering scalable solutions to strengthen food security and rural livelihoods in drought-prone regions.

Research from Nature Portfolio

Analyses using satellite observations have demonstrated that semicircular moisture-retention basins installed in degraded Sahelian soils can elevate vegetation greenness by up to 50% relative to pre-installation levels and by more than 25% compared with adjacent untreated areas. These interventions have persisted in their benefits over multiple seasons, illustrating the durability of simple earthworks for water conservation and biomass generation. In parallel, field surveys across the Sahel reveal that renewed rainfall patterns have prompted smallholder farmers to reintroduce longer-cycle millet cultivars, with adoption documented in approximately half of local communities. These studies underscore the interplay between climatic opportunities and socio-cultural factors that influence the diffusion of crop innovations under water-limited conditions.

Water Management Strategies in Semi-Arid Agriculture publication trend

The graph below shows the total number of articles in water management strategies in semi-arid agriculture across all publications each year (not limited to Nature Index journals).

Technical terms

Semi-arid: Climate characterised by low and variable rainfall (250–500 mm annually) and high evapotranspiration demand.

Rainwater harvesting: Collection and storage of runoff or rainfall using simple or engineered structures for agricultural use.

Half-moons: Semicircular earth depressions constructed on slopes to intercept surface runoff and concentrate moisture around plants.

Zaï: Small planting pits dug into compacted soils to capture water and incorporate organic amendments for improved germination.

Water use efficiency (WUE): Ratio of crop yield (biomass or grain) to the volume of water consumed or transpired.

Minimum tillage: Reduced soil disturbance practice aimed at preserving soil structure, moisture and biological activity.

Mulching: Application of organic or inorganic cover on the soil surface to reduce evaporation and regulate temperature.

References

1. Assessing impact of agroecological interventions in Niger through remotely sensed changes in vegetation. Scientific Reports (2023).
2. Soil water use efficiency under integrated soil management practices in the drylands of Kenya. Heliyon (2023).
3. Combining organic and mineral fertilizers as a climate-smart integrated soil fertility management practice in sub-Saharan Africa: A meta-analysis. PLOS ONE (2020).
4. Effect of contour rainwater-harvesting and integrated nutrient management on sorghum grain yield in semi-arid farming environments of Zimbabwe. Acta Agriculturae Scandinavica Section B - Soil & Plant Science (2022).
5. Does climate opportunity facilitate smallholder farmers’ adaptive capacity in the Sahel?. Humanities and Social Sciences Communications (2019).