Natural Farming, Soil Health, and Microbial Communities: A Comprehensive Perspective

Natural farming has emerged as a promising approach to sustainable agriculture by minimizing reliance on synthetic agrochemicals and enhancing ecosystem functions through biologically driven management practices. This review synthesizes current evidence on the effects of natural farming systems—including crop diversification, cover cropping, organic amendments, composting, reduced tillage, and integrated nutrient management—on soil health and soil microbial communities. Soil health is defined as the capacity of soil to function as a living ecosystem that sustains plants, animals, humans, and the soil microbiome, integrating physical, chemical, and biological attributes. Among these, soil microbial communities play a central role in regulating nutrient cycling, organic matter decomposition, carbon transformation, and soil structural stability. Evidence from long-term field studies indicates that natural farming practices generally improve soil physical properties (e.g., aggregate stability, porosity, and water-holding capacity), enhance chemical fertility (e.g., soil organic carbon and nutrient availability), and stimulate biological activity, including microbial biomass, diversity, and enzyme activities. Practices such as crop rotation, cover cropping, compost application, and reduced tillage consistently promote more diverse and functionally active microbial communities compared with conventional systems dominated by synthetic inputs. Although responses vary with soil type, climate, and management intensity, the overall trend supports the role of natural farming in restoring degraded soils and strengthening soil ecological functions. The review also highlights key challenges in adoption and emphasizes future research needs, particularly the integration of soil physical, chemical, and biological indicators with advanced molecular tools to better quantify the long-term sustainability and productivity of natural farming systems.