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History of fertilizer : ウィキペディア英語版 | History of fertilizer
The history of fertilizer has largely shaped political, economic, and social circumstances in their traditional uses. Subsequently, there has been a radical reshaping of environmental conditions following the development of chemically synthesized fertilizers.〔http://books.google.com/books?hl=en&lr=&id=G9FljcEASycC&oi=fnd&pg=PR11&dq=war++fertilizer+food+haber&ots=qMXZSF_QRM&sig=w8cL4hh1u9xNu-MzCm2fSrLJbkU#v=onepage&q=&f=false〕〔http://soil.scijournals.org/cgi/content/abstract/41/2/260〕 ==Ancient history== Egyptians, Romans, Babylonians, and early Germans all are recorded as using minerals and or manure to enhance the productivity of their farms. The use of wood ash as a field treatment became widespread. In the 1800s Humboldt recommended the use of guano.〔Heinrich W. Scherer "Fertilizers" in Ullmann's Encyclopedia of Industrial Chemistry, 2000, Wiley-VCH, Weinheim. 〕
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