Soils organic amendments are increasingly being used as an alternative to conventional inorganic fertilizer to reduce deterioration of soil quality brought about by high inputs of chemicals and to counteract the depletion of mineral phosphorus (P) sources. The organic wastes, now referred to as recycled organics (RO), have been used in recent years as soil amendments to improve soil quality and crop growth. However, continuous application of RO amendments may result in the accumulation of P in soil and can eventually lead to eutrophication in surface water through excessive P runoff. Bioavailability of P from applied RO is not only related to the P content of the RO and the soil total P content but also to the particular P forms present in soil. Phosphorus in soil occurs in multiple forms and fractions which differ in their availability for plant uptake. The distribution, dynamics and availability of P are controlled by a combination of chemical and physical processes as well as by microbial activity. To date, there is little information available on the dynamics of P in soil amended with RO and the associated microbial processes. This study thereby focuses on RO as a source of P in soil using two application rates.