The “Anjou Terroirs” programme aims at bringing the necessary scientific basis for a rational and reasoned exploitation of the technical itinerary of the terroir. The scale study is 1/12500. For the mapping, many parameters, such as the granulometry or the depth of soil are observed to each point of caracterisation. However, the composition and the quality of grapes do not depend directly on these parameters, but is influenced by variables such as water supply or vine precocity. These variables cannot be easily mapped, but can be estimated by algorithms based on expertise. The precision and the content of the cartographie study allow to quantify these main variables wich influence the vine behavior. It is therefore possible to build advisory maps that can be used by the vine growers at the scale of the parcellary. As an example, a map on rootstock adaptation to the terroir has been published. Thanks to the knowledge obtained through a network of experimental plots, five fundamental factors seems determinant to us, to choose a rootstock in Anjou condition: water supply, natural drainage, iron chlorosis power of soil, vigour potential and precocity potential conferred by the terroir.
Authors: P. GUILBAULT, R. MORLAT, D. RIOUX
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