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Nowadays, many vegetables are grown insidegreenhouses in which environment iscontrolled and nutrition can be supplied through water supply using electricalpump, namely fertigation. Dosage of nutrition in water for many vegetableplants are also known so that by controllingwater supply all the needsfor theplants to grow are available. Furthermore, water supply can be controlled usingelectrical pump which is activated according to theplants conditionin relationwith water supply. In order to supply water and nutrition in the right amountand time, plants condition can be observed using a CCD camera attached to imageprocessing facilitiesto develop a speaking plant approach. In this study,plants development during their growing periodare observedusing imageprocessing. Three populationsof tomato plants, with less, enough, and exceedednutrition in water,are captured using a CCD camera every three days, and theimages were analyzed using a developed computer program for the heightofplants. The results showed that the development of the plants can be monitoredusing this method. After that, the responseof plant growth in the samecondition was monitored, and the responsewas used as input for the fertigationsystem to turn electrical pump automatically on and off, so the fertigationsystem could maintain the growth of the plants.

Speaking Plant Approach for Automatic Fertigation System in Greenhouse