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L'absorption et la desorption d'eau par un superabsorbant commercial, un copolymere 70% acrylamide-30% acrylate de sodium reticule ont ete etudiees en faisant varier differents parametres en vue de son utilisation comme conditionneur de sol en agriculture. Des isothermes d'absorption et de desorption ont donc ete determinees en fonction de: la nature du sol, la position dans le sol, la granulometrie...