A system and method for measuring the plant/crop water consumption rate by means of wrapping suitable roots around the water-filled tensiometers when said tensiometers are placed into the ground. Thus the control system is constantly aware of the current plant/crop water consumption rate and schedules the irrigation events in accordance with it. Optionally the water-filled tensiometer(s) are also placed into a water permeable on top and bottom vertical capsule which is insulating the area near the tensiometer from the roots. The substantial change in the difference between the moisture content of a root-insulated capsule and the moisture content indicated by the root wrapped tensiometers outside of it will be deemed, when corroborated by the plant growth stage calendar and/or by other means, to indicate the plant/crop growth stage change. Alternatively determination of the plant growth stage is described based on the field/crop reflectance change or smell change. Subsequently the scheduling as well as the overall water amounts for the irrigation will be adjusted accordingly to the growth stage requirements for said stage duration thereby saving large amounts of water while satisfying the plant/crop water needs exactly and most timely.La présente invention concerne un système et un procédé permettant de mesurer le taux de consommation deau de plantes/cultures au moyen de lenveloppement de racines appropriées autour de tensiomètres remplis deau lorsque lesdits tensiomètres sont placés dans le sol. Ainsi, le système de commande est constamment informé du taux de consommation deau de plantes/cultures actuelle et planifie les événements dirrigation en fonction de celui-ci. Éventuellement, le ou les tensiomètre(s) rempli(s) deau sont également placés dans une capsule verticale perméable à leau sur la partie supérieure et inférieure qui isole la zone à proximité du tensiomètre des racines. Le changement substantiel au niveau de la différence entre la teneur en humidité dun
