Editorial: Climate-smart agriculture: enhancing sustainable crop production in arid and semi-arid environments through conservation of natural resources

1 Introduction

Drylands, encompassing hyper-arid, arid, semi-arid and dry-subhumid regions, occupy approximately 40% of the global land surface, while supporting the livelihoods of over 2 billion people (Reynolds et al., 2007). These environments are characterized by water scarcity, often resulting in soils with low organic-matter content and constraints to sustainable agricultural production. However, global agricultural production is heavily dependent on dryland agriculture, especially in arid and semi-arid climates (Figure 1). In addition, increasing variability in precipitation and temperature can accelerate land degradation and threaten food production and security in arid and semi-arid landscapes.

Climate-smart agriculture (CSA) is best understood as a comprehensive framework that simultaneously pursues sustainable productivity and economic profitability, enhances resilience to climate-related stresses, and reduces greenhouse-gas emissions where feasible in arid and semi-arid regions (Zheng et al., 2024). In agroecosystems constrained by water scarcity, these objectives cannot be achieved solely through intensification but require effective conservation and management of the underlying natural resources. The goals of productivity, adaptation, and mitigation within CSA are founded on a shared principle of natural resource preservation that includes judicious management of soil, water, and biodiversity (Lipper et al., 2014). This editorial synthesizes the contributions to the Research Topic and discusses how natural-resource conservation can support CSA in arid and semi-arid environments.

2 Water is the major limitation to agricultural production

In arid and semi-arid environments, water, rather than land or labor, primarily limits agricultural productivity. Although dryland regions contain both rainfed and irrigated production systems, much dryland cropping relies on rainfall-derived soil moisture, commonly termed ‘green water’ (Falkenmark and Rockström, 2006). However, irrigated agriculture is also expanding to mitigate the unpredictability of precipitation. Water policy and investment have historically focused on expanding irrigation, thereby comparatively neglecting the productivity of rainfed systems, despite their role in sustaining communities within these regions.

Climate extremes exacerbate this issue by increasing rainfall variability through uneven distribution throughout the year, often resulting in the same annual total being delivered in fewer but more intense events (Feldman et al., 2024; Pendergrass and Knutti, 2018). To reduce the resulting yield gaps, emphasis should be placed less on acquiring additional water and more on capturing and conserving the water already received. This can be done through regenerative management strategies such as conservation tillage (e.g., minimum tillage), mulching, and rainwater harvesting aimed at retaining moisture within the rooting zone for extended periods (Arp et al.; Lal, 2004).

3 Soil as the foundation to conserve and protect

If water availability sets the ceiling, soil determines how much of each rain event becomes available to the crop. Soils in the arid and semi-arid regions are typically low in organic matter, which affects fertility, water-holding capacity, structural stability, and overall soil health (Lal, 2004; Reynolds et al., 2007). Poor soil aggregation in these soils further fuels soil degradation due to erosion and structural instability. Soil biology, especially the rhizomicrobiome, provides essential ecosystem services such as nutrient cycling, pathogen control, and support for terrestrial biogeochemical cycles and helps plants mitigate environmental stress (Roy et al., 2026). In arid and semi-arid agroecosystems, their composition and roles are different, diverse, and relatively less explored compared to cooler, humid agricultural soils (Vásquez-Dean et al., 2020). Conservation and regenerative practices, including reduced tillage, cover cropping, and organic matter buildup/management, improve soil structure, enrich soil biological communities and diversity, and thereby strengthen overall soil functionality (Figure 2).

4 Crop diversity balances the risks under uncertainty

Concentrating agricultural production on a narrow set of crops and varieties is more vulnerable to climatic and market uncertainties. Diversification across species, across varieties, and across the seasonal calendar spreads that risk and measurably stabilizes agricultural production and food security from year to year (Renard and Tilman, 2019), which is why crop and varietal diversification sits at the core of the CSA toolkit (Lipper et al., 2014). This strategy further promotes investment in stress-tolerant, resource-efficient germplasm and advanced breeding approaches to develop crop varieties with enhanced tolerance to biotic and abiotic stresses (Mickelbart et al., 2015). Predictive models can help assess whether particular crops are likely to remain viable as regional conditions change. Matching the right diversity to the right place is, increasingly, an exercise in foresight as much as in food and agricultural sciences.

5 Advances in climate-smart agriculture research

This Research Topic combines six contributions that collectively advance CSA from broad principles toward region-specific, decision-ready evidence across three interconnected areas: water management, soil health, and biological diversity. The value of these contributions lies not only in the diversity of their evidence but also in their individual findings. Two original research studies represent practical applications and highlight a common lesson from two contrasting production systems in India under climate change scenarios. In Bihar’s (moist sub-humid, facing aridity) winter-maize fields, resilient productivity depended on combinations of agronomic practices rather than any single intervention (Jat et al.), while in Telangana (semi-arid tropics), grafting combined with protected cultivation increased tomato yield and farm profitability under climatic stress (Khopade et al.). The main message is that improvements in productivity and adaptation in arid and semi-arid regions result from integrated management, not from isolated inputs. Three synthesis pieces then map the broader landscape and its limits. A systematic review of rainfed systems in Ethiopia emphasizes resource conservation by quantifying yield and water-productivity gaps and recommends the inclusion of green-water management in national policies (Teferi et al.). A review of regenerative practices shows that their benefits for soil health and climate mitigation are context-dependent and constrained by agronomic, economic, and adoption factors (Arp et al.). A systematic mapping of Mediterranean-type climates found that the knowledge base was substantially lacking in information about what can be implemented to adapt to or mitigate climate change, as well as the net climate impacts of various interventions (Buchanan et al.). Another modeling study projected declining environmental suitability for both oilseed crops in the Northern Great Plains, with a greater decline for canola than for camelina, highlighting the need for region-specific crop adaptation planning under future climates (Quinlan and Goslee).

A key takeaway from this body of work is that, while individual field studies show productivity gains, reviews and modelling research indicate that the extent and longevity of these benefits rely on specific site conditions, system design, and future climate scenarios. This contradiction is the key contribution of this synthesis, revealing a major limitation: most evidence comes from studies in limited geographic areas or particular production systems, with only sparse validation across different agroecological regions. Therefore, these findings highlight the need for integrated, multi-practice climate-smart agriculture frameworks that can translate local insights into sustainable results across productivity, adaptation, mitigation, and resource conservation.

6 Conclusions and future directions

Together, these contributions indicate that CSA in arid and semi-arid regions requires integrated management of soil, water, crops, and biodiversity rather than reliance on isolated interventions. The findings from this collective research also highlight areas requiring further attention, including (i) integration of socioeconomic determinants of CSA adoption into biophysical research, (ii) the extension of evidence to the numerous underrepresented dryland regions, especially arid and semi-arid agroecosystems, and (iii) the development of decision-support tools that effectively translate research findings into actionable guidance for growers. We thank all authors and reviewers for their contributions to this Research Topic and to the advancement of sustainable crop production in water-limited environments.

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Footnotes

Edited and reviewed by: Sangeeta Lenka, Indian Institute of Soil Science (ICAR), India