The objectives of this research are to study the relation between the different of nitrogen sources and the compost maturation by comparing with composting time and to analyze the quality of composted products. The leaves of rain tree (Samenea saman Jacq.Merr.) and water hyacinth (Eichhornia crassipes) were used as the basic composted material with the ratio of 2:1 w/w. Three types of organic waste; eg. fresh fish residual, swine manure and sludge from waste water treatment of chicken frozen factory were added as the different nitrogen sources. Urea fertilizer was used as a control treatment. All treatments was the initial of C/N ration at 30:1 and compared with the maturation time of composting at C/N ratio be equal or below 20:1 The results of experiment found that the different of nitrogen sources were effect on physical and chemical properties of compost by comparing with the maturation time of composting at C/N ratio was below 20:1 for treatment of urea fertilizer, fresh fish residual, swine manure and sludge 49, 56, 70 and 60 day, at C/N ratio 13.28, 10.38, 14.55 and 15.51, respectively and the total nitrogen of materials were 46, 2.53, 2.81 and 2.03%, respectively. The results showed that the different of nitrogen sources did not relate with the maturation time. In addition, the total nitrogen content of the sludge compost was higher than the treatment of fresh fish residual, swine manure and urea fertilizer 1.86, 1.83, 1.65 and 1.65%, respectively. The total P2O5 content of the sludge compost was higher than the treatment of swine manure, fresh fish residual and urea fertilizer 0.16, 015, 0.13 and 0.09%, respectively and the same of total K2O content were 0.16, 0.14, 0.13 and 0.08%, respectively. Conclusion, the differential nitrogen sources are influence on physical and chemical properties of compost because it stimulated a fermentation of compost and gave the macro-nutrition of the plant in the different amount. This study found the best of nitrogen source of organic waste was the fresh fish residual and second were sludge and swine manure, respectively.
