White Gold' guano fertilizer drove agricultural intensification in the Atacama Desert from AD 1000 (original) (raw)

Nature Plants, 2021

Abstract

The archaeological record shows that large pre-Inca agricultural systems supported settlements for centuries around the ravines and oases of northern Chile’s hyperarid Atacama Desert. This raises questions about how such productivity was achieved and sustained, and its social implications. Using isotopic data of well-preserved ancient plant remains from Atacama sites, we show a dramatic increase in crop nitrogen isotope values (15N) from ~AD 1000. Maize was most affected, with 15N values as high as +30‰, with human bone collagen following a similar trend; moreover, their carbon isotope values (13C) indicate a considerable increase in the consumption of maize at the same time. We attribute the shift to extremely high 15N values – the highest in the world for archaeological plants – to the use of seabird guano to fertilise crops. Guano – “white gold” as it came to be called – thus sustained agricultural intensification, supporting a substantial population in an otherwise extreme e...

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