Abstract
IRAT (Institut de Recherches Agronomiques Tropicales) has set up a network of trials at various sites in Reunion on soils of volcanic origin. The peculiar properties of these soil have led to a study of their hydrological behaviour with respect to crop water requirements. Soils in Reunion have andic characteristics whose particular properties towards water are still not clear. This work has been directed towards the determination of the main processes that control the movement of water in the field. The use of a neutron probe has made it possible to study fairly accurately the changes in water storage through time and to set up a model that estimates the actual evapotranspiration from soil water content. The model which was set up to simulate water balance from data obtained makes it possible to follow changes in water storage through a season. In terms of methodology, it is a diagnostic tool that helps in the interpretation of neutron probe data and crop yield data.
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