Soil physical structure and particle size distribution are fundamental factors governing its physico-chemical behaviour.These characteristics strongly influence water retention, nutrient availability, and overall soil fertility.This study investigates the effects of organic manure application on soil structure through soil samples analysis employing Scanning Electron Microscopy (SEM) along with Dynamic Light Scattering (DLS). SEM imaging provided high-resolution morphological insights, revealing structural differences between untreated and amended soils. Notably, organic manure application resulted in more cohesive aggregates with enhanced porosity, indicating improved soil aeration and water retention capacity.DLS analysisindicated that the mean soil particle size in the control plot was 892.9 nm. Particle size increased substantially with organic amendmentsreaching 1092 nm in the GM+SM+VC (12.5 t ha-1) treatment.This finding points toward the formation of larger aggregates, likely due to improved organic matter content and microbial activity. The results demonstrated that organic amendments contributed to a more heterogeneous soil structure with increased particle connectivity and surface roughness. These changes are associated with enhanced nutrient-holding capacity and soil stability, which are crucial for sustainable agricultural practices. Overall, the study highlights the significant role of organic amendments in altering soil morphology and particle size distribution, leading to improved soil quality. By enhancing soil structure and fertility, organic manure application promotes better crop growth and sustainable land management. These findings emphasize the importance of adopting organic amendments for long-term agricultural productivity and environmental sustainability.