Phosphorus cycle is a sedimentary nutrient cycle in which materials involved in circulation between biotic and abiotic components of biosphere are non-gaseous. Phosphorus is mostly used as phosphate. Its reservoir pool is phosphate rocks whereas cycling pool is soil for terrestrial ecosystems and water for aquatic ecosystems. Atmosphere or gaseous cycle is absent. Phosphate circulates in the abiotic environment in lithosphere as well as hydrosphere.