To maintain growing crops and the soil, access paths are formed through the growth, with the growths on both sides of the tracks. The vegetation is scanned on both sides of the tracks by pulsed laser beams on a horizontal or slightly angled alignment within a truncated cone mantle, to cover the front and sides and the zone over the carrier (1) with a spiral beam movement over the crop growths. The vegetation is scanned by the laser beams from a transmitter (7) in a high resolution light point grid on various levels, with one or more timers synchronized with the laser emission starts for level values. The timers are stopped to determine the different reflection levels from the grid of light points to give separate and/or common path, position and target data. Sensors (3) transmit data signals, from the reflected beam receiver (8) for processing into morphological and physiological characteristic values, and correct the operation of plant sprays, etc.
