Method and device for automatic administration of liquid...

A - Human Necessities – 01 – G

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A01G 27/00 (2006.01) A01G 31/02 (2006.01)

Patent

CA 2320845

The present invention relates to a method and a device for automatic administration of liquid nutrients to plants (5), wherein said plants (5) are placed on an absorbent substrate (2) that has been placed in a tray (1) which is provided with at least one discharge (3), wherein said method comprises the following steps: a) administration of a quantity of nutrients to the substrate (2), b) determination of the weight of the tray (1). The method according to the present invention is characterised in that: c) calibration is carried out by determining the saturation level of the substrate (2) and taking the weight of the tray (1) and the contents thereof at the point in time when the saturation level is reached as the calibration weight; d) a threshold value for the weight of the tray (1) and the contents thereof is determined on the basis of the calibration weight determined in c); e) a specific quantity of nutrients is administered when said weight falls below the threshold value.

La présente invention concerne un procédé et un dispositif d'administration automatique d'éléments nutritifs liquides à des plantes (5) disposées sur un substrat absorbant (2) lui-même placé dans un bac (1) muni d'au moins un dispositif de décharge (3). Le procédé consiste à: a) administrer une quantité d'éléments nutritifs au substrat (2); b) déterminer le poids du bac (1); et se caractérise en ce que c) l'étalonnage s'effectue par détermination du niveau de saturation du substrat (2) et l'adoption du poids du bac (1) et de son contenu au moment précis où le niveau de saturation est atteint comme poids de référence; d) une valeur de seuil pour le poids du bac (1) et de son contenu est établie sur la base du poids de référence déterminé à l'étape c); e) une quantité spécifique d'éléments nutritifs est administrée lorsque ledit poids de référence tombe au-dessous de la valeur de seuil.

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