Soil microbial diversity: The hidden wealth of sustainable farming

Soil harbors diverse microbial communities that are fundamental to soil health and agricultural sustainability. Despite their ecological and agronomic importance, these communities remain underutilized as biological resources for improving crop production. With increasing concern over future food security under population growth, land constraints, and environmental degradation, biologically informed alternatives to input‐intensive agriculture are urgently needed. Soil microorganisms contribute to agricultural productivity through nutrient transformation, mineral solubilization, phytohormone production, metabolite secretion, and interactions that influence soil structure and plant performance. However, translating this potential into sustainable farming requires a clearer understanding of microbial taxonomy, ecological function, depth‐specific distribution, and plant–soil–microbe interactions. This review synthesizes current knowledge on soil microbial diversity and highlights the roles of microbial communities in metabolite secretion, nutrient dynamics, and soil ecosystem functioning. We also discuss how these processes can be better harnessed to support sustainable agriculture. By integrating recent literature on microbial diversity, functional traits, and soil‐profile heterogeneity, this review emphasizes both the opportunities and the current knowledge gaps in using soil microbiomes to strengthen agricultural resilience and long‐term soil health.