Abstract: An agricultural sprayer for spraying a mixture of a carrier liquid and at least one active ingredient, and including a carrier liquid container, at least one active ingredient container for containing the active ingredient in concentrated form, a mixing chamber for mixing the carrier liquid with the active ingredient, at least one active ingredient feed line between the at least one active ingredient container and the mixing chamber and a carrier liquid feed line between the carrier liquid container and the mixing chamber, a boom structure having at least one nozzle connected with said mixing chamber for spraying the mixture of the active ingredient and the carrier liquid, and means for generating and discharging a flow of gas under pressure. The sprayer has connecting means that allow gas low communication between said means for generating and discharging a flow of gas under pressure and said at least one container for receiving an active ingredient.