Cow dung compost is typically composed of decomposed cow manure, straw or hay, and other organic materials, such as leaves or grass clippings. The manure is collected from cows and then stored in a dry, ventilated area until it has decomposed and formed a dark brown or black, crumbly material. castor oil cake Improves soil fertility as it is a rich source of NPK and other essential micronutrients.Increases humus content, helps in growth of earthworms.Balances soil pH and improves soil aeration resulting in better root development.Inhibits growth of termite & other pest.Can be use with other fertilizers for synergistic effect.Can also be used as a fuel in boiler due to its high calorific value, instead of lignite or coal.