Castor cake is also called as castor meal. Castor cake is an organic by product of castor seed oil production. Castor cake is used as a natural fertilizer. It enhances the fertility of the soil. Like Pongamia and Neem castor cake has also in it Nitrogen, Phosphorus and potassium and also has traces of nutrients like Manganese, Zinc and copper thus making a balanced fertilizer. They provide slow and steady nourishment, stimulation, Protection from soil Nematodes and insects. It improves physical, chemical and biological properties of the soil.