The concentration of Cu and Zn in the compost produced from Horse dung (HDC) was 10.4 and 108 mg kg ^-1. The concentration of Cu and Zn in the compost produced from Swine manure (SMC) was 183 and 670 mg kg ^-1. Moreover, Cu was mainly collected into a fraction of Organic-complexes, and Zn into a fraction of Iron and manganese oxide.
For cultivation experiments, HDC and SMC was mixed with polytetrafluoroethylene (TF) powder and used as a medium for Peas (Pisum sativam L.). Cu in HDC-TF medium and SMC-TF medium mainly existed as Organic-complexes form. Additionally, Zn in these mediums mainly existed as Carbonate and Iron and manganese oxide forms. It was considered that Cu and Zn in Organic-complexes form were gradually transferred to a water-soluble fraction which is bioavailable according to cultivation time. Finally, it is supposed that the fraction of Organic-complexes form played as a storage (so called “Sink”) of Cu and Zn.