Organic fertilizers are derived from animal and plant matter animal excreta (manure) and vegetable matter (e.g. compost and crop residues). Naturally occurring  include animal wastes from meat processing, peat, manure, slurry, and guano. That is usually made from plant or animal waste or powdered minerals. Examples include manure and compost as well as bone and cottonseed meal. They are usually sold as "soil conditioners" rather than because the nutrient ratios are difficult to guarantee and our company manufactures.