Abstract

• erious environmental and health problems can be managed, through production of compost. In the present research work, raw organic materials (cow dung, corn stalk and kokko leaves) that are well suited for application to the soil as a fertilizer or soil conditioner were used as materials for composting. Five kinds of composted organic fertilizers were prepared by using various ratios of these organic waste materials and EM solution and then some physicochemical properties (pH, moisture, EC, Organic matter, C:N ratio, total N, total P2O5, total K2O, Ca, Mg, S) and trace elements (Fe, Zn, Mn and Cu) necessary for plants of composted organic fertilizers were qualitatively and quantitatively characterized by EDXRF, AAS, and others modern and conventional methods. According to these data, the nitrogen and phosphorus contents of sample 3 (cow dung+ EM) are higher than the others (sample 1,2,4 & 5). However, secondary nutrients, micronutrients and trace elements were higher in samples 1, 2, 4, & 5. Therefore, macronutrients, micronutrients and trace elements needed for plant growth were found in these fertilizers. Thus, making combination of different organic wastes as compost is beneficial for plants by fulfilling of plant nutrients through organic resources and their application in a balanced way for maintaining soil productivity. Furthermore, the use of composted organic fertilizer will not only supplement the chemical fertilizers, but also reduce environmental pollution.