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Guano
Guano (via Spanish, ultimately from the Quechua ''wanu'') is the excrement of seabirds, cave-dwelling bats, pinnipeds, or (in English usage) birds in general.[(【引用サイトリンク】 title=Seabird Guano and Bat Dung )〕 As a manure, guano is a highly effective fertilizer due to its exceptionally high content of nitrogen, phosphate and potassium: nutrients essential for plant growth. The 19th-century guano trade played a pivotal role in the development of modern input-intensive farming practices and inspired the formal human colonization of remote bird islands in many parts of the world. During the twentieth century, guano-producing birds became an important target of conservation programs and influenced the development of environmental consciousness. Today, guano is increasingly sought after by organic farmers.]
==Composition==
Seabird guano consists of nitrogen-rich ammonium oxalate and urate, phosphates, as well as some earth salts and impurities. Unleached guano from favored locales, such as the Chincha Islands off the coast of Peru, typically contains 8 to 16 percent nitrogen (the majority of which is uric acid), 8 to 12 percent equivalent phosphoric acid, and 2 to 3 percent equivalent potash. The fresh excrement of insect-eating bats can have nitrogen levels approximating that of seabird guano and high phosphate levels, but bat guano typically has less fertilizing value than seabird guano from arid areas because its nitrogen content is more easily leached within cave environments.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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