The Chincha Kingdom was transporting seabird excrement from islands to valleys as early as the 13th century, and this powerful fertiliser may have been key to its economic success
Več na: https://www.newscientist.com/article/2515350-ancient-peruvian-civilisation-grew-mighty-by-harvesting-guano/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home
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