In biogas plant there is a release of mainly two products. Methane gas which use for different purpose like cooking, lighting and slurry which can be used as organic fertilizer. The main target of this study was characterizing the slurry by measuring the relative amount of macro and micro nutrients like Nitrogen, Phosphorus, Potassium Calcium, Magnesium, and Manganese by using standard methods. And comparative study of the organic fertilizer at different treatments with commercial fertilizer on selected crops. Potassium and Calcium (part of plant cell wall) show positive deviation when it was composted.