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New plant macrofossil studies in northwestern France enable a better insight into agriculture through the Bronze and Iron Age. Most of the previous analyses, carried out in Calvados (Normandy) on Late Iron Age dwellings, suggested distinctive characteristics such as the increase of Avena (oat) and the abundance of pulses in storage pits. The collection of a new database with 25 sites was done in response to the previous lack of studies, which became an issue in Brittany, Normandy and the Loire region, which are known for their western location and trade links throughout Europe. This paper deals with farming practices and their changes during the Bronze and Iron Ages. The aim was to gather new evidence related to sowing times, tilling of fields and fertility management of soils in order to discuss extensive or intensive cultivation in northwestern France. The crop cultivation techniques were investigated by studying the weed flora composition according to the FIBS approach (Functional interpretation of botanical survey). The results reveal combinations of evidence and a pattern of intra-regional diversity. [ABSTRACT FROM AUTHOR]