Pre-Incans collected seabird poop from remote islands to use as fertilizer: Guano-based agriculture became highly prized in the Inca empire.

  • Published In: Sciencemag.org, 2026. P. N.PAG 1 of 3

  • Database: Applied Science & Technology Source Ultimate 2 of 3

  • Authored By: Larson, Christina 3 of 3

Abstract

The article focuses on the historical significance of guano, or seabird excrement, in agriculture, particularly within the Inca empire and its precursors, the Chincha. Research indicates that the Chincha harvested guano for fertilizer as early as 800 years ago, enhancing their agricultural productivity and social status before their incorporation into the Inca empire. The study analyzed ancient maize from Chincha tombs, revealing elevated nitrogen levels consistent with guano use, thus providing direct evidence of its role in pre-Inca agriculture. This finding suggests that guano may have been a key factor in the Chincha's importance and strategic alliance with the Inca. [Extracted from the article]

Additional Information

  • Source:Sciencemag.org. 2026/02, pN.PAG
  • Document Type:Article
  • Subject Area:Social Sciences and Humanities
  • Publication Date:2026
  • Accession Number:191520747
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