A robot system (100) for automatically managing agricultural activities is disclosed. The robot system (100) includes a chassis (102), a plurality of parallel link arms (104), a body assembly (108), and a robotic arm (202). The robotic arm (202) is mounted on top of the body assembly (108). The robotic arm (202) performs crop disease identification, pesticide spraying, soil sampling, and crops harvesting. The body assembly (108) includes a sensor and actuator unit (204) that captures data corresponds to a location of diseased plants, fruits on each tree, or points on a vine to prune. Each of the plurality of parallel link arms (104) is configured to connect each of the one or more top assembly (102b) with each of a plurality of shoulders (106) using slotted brackets (116) that enable adjustment of the height of the robot system (100) in a desired configuration based on field requirements.