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This article presents an application of a robotic system for agricultural. Initially, we designed and built a robot for hydroponics, built for moving on rails and using an image processing system to analyze plant growth. The hydroponics plant care robot is like a helper to take care of the vegetables in the field. And the robot can work continuously for 6 hours on a single charge. In this article, data on the growth of kale were collected. Growth was analyzed as a percentage of growth per unit area as captured by the camera. In experiment 1, was an appropriate movement speed test to detect vegetable growth. The robot spent an average of 3 minutes 19 seconds on rails in the laboratory for 1.25 meters, or an average speed of 0.392 meters/min, which was approximately 29.55% slower than humans (compared to walking around the plants around a human plot). But the robot could take care of every plant, which is more thorough than human activity. The second experiment was about detecting the position of plants. The positioning accuracy was 86.67% on average. Finally, in the third experiment, the results of the experiment were used to detect the growth of plants in each planting trough, with 4 planting troughs, 3 plants in each planting trough, running back and forth a total distance of 0.65 m. 90.9%. [ABSTRACT FROM AUTHOR]