Asian Journal of Agricultural Extension, Economics & Sociology

Traditional agricultural systems (TAS) are place-adapted social-ecological systems in which crop, livestock, aquatic and tree diversity, ecological processes, local knowledge and community institutions have co-evolved with food production. Their contemporary significance is increasingly invoked in debates on biodiversity loss, climate resilience, sustainable intensification and rural development, yet the evidence base is uneven and often combines distinct system types under broad labels such as traditional, Indigenous or agricultural heritage farming. This critical narrative review examines the ecological and socio-economic significance of TAS while testing the strength and transferability of the claims made for them. Literature was selected from multidisciplinary and agriculture-focused scholarly sources for 1990 to 17 July 2026, with earlier foundational evidence eligible when conceptually necessary. The synthesis focuses on landrace-rich polycultures, tropical homegardens and multistrata agroforestry, terraced agriculture, rice-aquatic animal co-culture, long-fallow swidden systems and shaded perennial production, with agricultural heritage designations treated as an institutional subset rather than a synonym for TAS. Evidence is strongest where mechanisms and outcomes converge across study designs. Diverse TAS can conserve agrobiodiversity, support habitat complexity, reduce selected external inputs, regulate soil and water processes and spread production risk. Rice-fish co-culture provides unusually strong experimental and meta-analytic support for trophic regulation and input substitution, whereas claims of general climate resilience remain more dependent on observational and inferential evidence. Socio-economic outcomes are more contingent. TAS can support dietary diversity, culturally valued foods, livelihood portfolios, local identity and niche-market opportunities, but benefits are conditioned by labour requirements, tenure, market access, policy incentives, migration and the distribution of value along supply chains. Tourism and heritage branding can finance conservation but may also commodify culture or distribute gains unevenly. The central implication is that TAS should neither be romanticised nor displaced through uniform modernisation. Policy and research should prioritise dynamic conservation: maintaining ecological functions, knowledge transmission, farmer agency and institutional capacity while allowing technically and economically defensible adaptation.