Abstract
Earliness choice is a key factor of maize profitability as well as irrigation water management. The knowledge of earliness groups in a wide area may help with correctly estimating the irrigation demand. In order to identify the explaining factors of the spatial distribution of maize earliness groups in an irrigated area of south-western France, we analysed recommended practices and actual farmer practices. We found a great diversity of practices. The estimation of their spatial distribution cannot rely only on recommended practices or simple rules linking the sowing date to an earliness group.
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