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Reverted edits by Julietthompson (talk) to last revision by VPropp
'''Manure''' is material—usually some kind of farm waste material, often consisting the feces of animals—used as agricultural fertilizer. It must be used with care to prevent the spread of [[bacteria]]l infection.
Human manure, known as "night soil," was a traditional form of fertilizer in [[China]] and [[Japan]]. Human manure was also used in Europe untill about the middle of the 19th century. At that point it was usually replaced by cheap and effective Guano imported from [[Peru]]. In the United States, heavily treated products derived from municipal sewage are sold for use as fertilizer, one example being Milorganite.<ref>[http://www.milorganite.com/about/history.cfm Milorganite: Our History]</ref>
''Green manure'' consists of crops which are deliberately planted for the purpose of being plowed under later in order to improve the soil.
During the First World War, the Germans were successfull in fixating nitrogen from the athmosphere, thus heavily reducing the need for 'natural' manure.
==Notes and references==
<references/>
G.J. Leigh: The worlds greatest fix: A history of nitrogen and agriculture. Oxford University Press 2004.
[[category:agriculture]]