There are too much agricultural wastes that can make an environmental pollution. The management and reuse of organic wastes decreases environmental problems and increases utilization of these matters. One of the most important ways to use organic waste materials is reuse of them in agriculture especially as compost. Composting of garden and animal wastes, e.g. sawdust and manure, is the best method that could improve the properties of this materials for reusing in production cycle. Here two separate studies were performed to evaluate the effects of co-composting of sawdust and different nitrogen sources on characteristics of these mixtures during composting process as well their effects as growing media on the cucumber growth. In the first study the effects of co-composting of sawdust with cow manure, poultry manure and urea on some characteristics of these mixtures were evaluated. This study was carried out during 49 days and the samples were taken at 0, 7, 14, 21, 28, 35, 42 and 49 days of incubation and analysis was done. Results showed that adding of poultry manure to sawdust had the best effect on reduction of organic carbons and increasing carbon to nitrogen ratio and the maximum of nitrogen content was obtained in mixing with cow manure during the composting period. Also application of N-rich material was improved water holding capacity of these mixtures when compared to control. Poultry manure significantly increased particle and bulk density more than other treatments. The lowest bulk density as well highest aeration porosity was obtained at 35th day after incubation. In the second study we used of the mixtures produced in the first study with 10% pumice or without Pumice as growing media for cucumber cv.Storm. Here we used also Peat 80% + Perlite 20% mixture which is a common growing media for cucumber, as a control to compare with our treatments. The results of this study showed that adding of poultry manure to sawdust has the most positive effects on growth characteristics (plant height, number of nodes, stem diameter and dry weight) and characteristics of cucumber roots in comparison with the pure sawdust. There were no significant differences on percent of fruit dry matter between treatments. The maximum fresh weight and number of fruits obtained when manures added to sawdust. The results also showed that co-composting of sawdust with inorganic and organic nitrogen sources could improve the properties of fruits quality such as soluble solids content in comparison with sawdust and the highest concentration of nitrogen, sodium, potassium in fruits observed in pure sawdust treatment. According to this study, co-composting of sawdust with animal manures particularly with poultry manure could be recommend for practical study as a growing media for cucumber. Keywords: Compost, Media culture, Sawdust, Nitrogen rich source