Chemical analyses of phosphorus (P), carbon (C) and nitrogen (N) content were applied to an Iron age building located at Rotzo in the Asiago plateau (NE-Italy). Both total P and organic P distributions were high in the north-eastern zone and along the southern wall where there was an accumulation of the organic matter. The clustering of highest inorganic P values along the eastern wall highlighted the opposition of domestic activities between eastern and western areas, according to the highest values of the C:N ratio. The different forms of P provided good suggestions about the use of the inner space. In particular, oxalate extractable-P individuated the most ancient phase of life of the house.
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