ABSTRACT
An aggregate is defined as “a naturally occurring cluster or group of soil particles in which the forces holding the particles together are much stronger than forces between adjacent aggregates”. Aggregation or formation of organo-mineral complexes is a process as important as but much less understood than photosynthesis. There are two distinct scientific approaches to understanding the process of aggregation. These are, physio-chemical approach based on electrokinetic processes involving flocculation and cementation, and pedological approach based on soil genesis and factors of soil formation. Temperature and moisture regimes affect aggregation through their influence on weathering leading to differences in texture and clay minerals, and humus content and its quality. Duration and intensity of cultivation have significant impact on soil organic carbon content and aggregation through their effects on biomass input, soil aeration, soil temperature, and moisture regimes, and rate of decomposition.
