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Line 1: − + − − 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]]
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'''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.
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