“The Study of Impact Assessment of Biofertilizers in Arecanut Plantation in Coimbatore District” evaluates the role of biofertilizers in improving crop productivity, soil fertility, and sustainability in arecanut cultivation. Based on field-level research with farmers in Coimbatore, the study demonstrates how biofertilizers such as Azospirillum, phosphate-solubilizing bacteria, and mycorrhizal fungi enhance plant growth, nut yield, and soil microbial activity while reducing dependence on chemical fertilizers. The findings highlight the potential of biofertilizers as a sustainable input in integrated nutrient management and provide region-specific insights valuable for both academic and farming communities.