Natural Farming for Sustainable Crop Production and Soil Health: A Critical Comprehensive Review

Abstract

Natural farming has moved from a group of locally adapted, low-external-input practices to a prominent agricultural policy proposition, particularly in India. Its appeal rests on the linked aims of reducing dependence on purchased agrochemicals, rebuilding soil biological function, maintaining crop production and improving farm profitability. Yet the label encompasses heterogeneous systems, and evidence for particular components is often stronger than evidence for the complete package. This critical narrative review examines natural farming as an agroecological redesign strategy, with emphasis on crop productivity, soil health, nutrient sufficiency, water relations, biodiversity, farm economics and implementation at scale. Literature available from 1990 to 5 June 2026 was identified through accessible scholarly indexes, bibliographic searches, institutional sources and citation tracing. Direct comparative evidence from Indian natural-farming programmes was integrated with higher-level evidence on organic amendments, soil cover, reduced disturbance, crop diversification and microbial inoculation. The strongest and most transferable support concerns permanent or frequent soil cover, organic-matter return, diversified rotations and intercrops, and reduced reliance on broad-spectrum pesticides. These practices can improve soil aggregation, moisture retention, microbial biomass and several regulating ecosystem services. Direct field studies in south-eastern India indicate that well-managed natural farming can maintain or increase yields and reduce production costs in some settings, while recent landscape evidence shows comparable yields, higher profits and improved farmland bird abundance. Confidence is nevertheless moderated by short experimental duration, treatment bundles that prevent attribution to individual practices, uneven geographical coverage and limited nutrient budgets. Biological activity cannot create phosphorus, potassium or other exported elements, and nitrogen supply may become constraining in high-yielding systems without legumes, recycled biomass or other accountable sources. Natural farming is therefore best understood as context-specific ecological intensification rather than universal input elimination. Credible scaling requires phased transition, soil- and crop-specific nutrient accounting, independent long-term trials, multidimensional monitoring and adaptive safeguards for farmers whose production systems have high nutrient demand.