Organic fertilizers are a type of carbon (C)-rich fertilizer that occurs naturally.[1] Fertilizers are materials that are applied to the soil and plants to provide nutrients and maintain growth. Organic fertilizers include mineral sources, all animal waste, liquid compost, guano, plant-based fertilizers such as compost, biosolids.[2] There are also other inorganic and non-chemical fertilizers that follow the principles of organic farming, which can be used in commercial organic farming.