Fertilizers are products designed to ensure plant nutrition or to improve the physical, chemical and biological properties of the soil. It includes mineral fertilizers (fertilizers) and organic materials such as humus. Organo-mineral fertilizers contain both organic matter of plant and / or animal origin and mineral fertilizers. They must contain at least one percent of nitrogen of organic origin. In organic fertilizers, all the nutrients have an animal or vegetable origin. These include animal dung , leather powders, horn powders, etc.