ABSTRACT
The presence of earthworms can be seen as an added benefit to many agricultural systems since earthworms contribute greatly to the overall physical properties of agricultural soils [1]. The study in sole cropping systems have focused on the ability of earthworms to facilitate soil mixing and the decomposition of organic matter which is especially important in agricultural systems [2-4]. Earthworms also affect soil properties by increasing soil porosity and decreasing bulk density through bioturbation and cast deposition on the soil surface [1]. Earthworm activity stimulates mineralization
of N in residues which promotes the availability for plants and microorganisms of inorganic forms of N from plant material [1, 5].
