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Manuring practices in the first millennium AD in southern Sweden inferred from isotopic analysis of crop remains
Fig 7
Stable nitrogen isotope values in grain from House 11 at regional center Uppåkra.
Dashed horizontal line at 6.3 ‰ indicates difference between low and high inputs of manure.
doi: https://doi.org/10.1371/journal.pone.0215578.g007