Organic manures are included well rotten Farm Yard Manure (FYM), Compost, Green manures etc. Generally, Farm yard manures and composts are the decomposed products of agricultural byproducts (animals and crops).
Normally organic manures are applied to the soil as a source of fertilizer, NPK (Nitrogen, Phosphate and Potassium) must have to be about 3.0 percent of the dry weight of the manures in order to meet the needs of the soil micro-organisms, otherwise little or no NPK will be released for the use of plants.
The Carbon Nitrogen ratio (C:N ratio) in the organic manure should be between 24:1.