Poultry manure or guano (in English: Guano) or seagull manure, in geology, refers to phosphate deposits caused by the feces of seagulls, seabirds, bats, and jaws, and it is an expensive material with a high level of phosphorus and nitrogen, which is It is used as fertilizer and one of the components of making gunpowder. Guano is a very strong fertilizer. Its constituent elements are ammonia, uric acid, phosphoric acid, gazalic acid and carbonic acid, as well as earth salts and impurities.