There was an initial decline in MWD from installation to two months after installation most likely because of sample disruption during sample preparation, i.e. mixing soil with ORs and fertilizers. There after, the proportion of macroaggregates tended to increase with a significantly greaterMWD at eight months compared to two and five months after installation Mean weight diameter at eight months was similar to that at installation of the mesocosms. Similarly, the coarse POM, microaggregates and silt and clay fractions within macroaggregates increased with time