The present invention relates to a system for filling a sprayer tank with at least one liquid solution, including at least a first tank containing a first liquid solution and a second tank configured to contain a second liquid solution, means for temporarily connecting the system to the tank, means for incorporating an active material into the first tank or between the first tank and the connecting means, and pumping means controlled by a control device and configured to selectively fill the tank with the liquid solution(s). The system also includes means for preparing the first liquid solution in the first tank by mixing the second solution and the active material in predetermined proportions. The means for preparing the first liquid solution include at least the means for incorporating the active material, which are positioned between the first tank and the second tank, as well as agitation means configured to ensure that the first liquid solution remains a suspension in the first tank.
