‘White gold’ guano fertilizer drove agricultural intensification in the Atacama Desert from ad 1000 | Semantic Scholar

Previously undescribed stable isotope determinations of charred cereals and pulses from 13 Neolithic sites across Europe show that early farmers used livestock manure and water management to enhance crop yields and suggest that commonly applied paleodietary interpretations of human and herbivore δ15N values have systematically underestimated the contribution of crop-derived protein to early farmer diets.