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Did seabird poop fuel rise of Chincha in Peru?

Did seabird poop fuel rise of Chincha in Peru?

A nutrient-rich natural fertilizer Now Bongers has turned his attention to analyzing the biochemical signatures of 35 maize samples excavated from buried tombs in the region. He and his co-authors found significantly higher levels of nitrogen in the maize than in the natural soil conditions, suggesting the Chincha used guano as a natural fertilizer. The