The invention relates to a system (1) for spraying vegetation treatment liquid comprising main spraying devices (4, 4 ') forming pairs of devices each delimiting a spraying zone (12), each spraying device. main comprising treatment liquid spray means (7) as well as treatment liquid recovery means. According to the invention, the system comprises two additional spraying devices (6) of different design from that of the main spraying devices (4, 4 '), each additional device (6) being arranged movable relative to its associated end device ( 4 ') between a first inactive rest position, and a second operating position in which the additional device (6) is located, in the transverse direction (10), further away from its associated end device (4') than in the first inactive rest position. Figure for the abstract: Figure 1
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