The trailed tank (1) for the spraying of plant protection and fertilizing products comprises:- a base frame (2)；- movement means (3), associated with the base frame (2) and adapted to move the base frame (2) onto the ground；- a reservoir (4) associated with the base frame (2) and defining a first volume (5) for containing a liquid (6)；- a mixing assembly (9) associated with the base frame (2) and housed in a second volume (10), the mixing assembly (9) being adapted to mix the liquid (6) with at least one plant protection and/or fertilizing product (11) to obtain a product to be sprinkled (12)；- a spraying assembly (16) of the product to be sprinkled (12) which is associated with the base frame (2)；- a hydraulic circuit (17), fluid-dynamically connected to the reservoir (4), to the mixing assembly (9) and to the spraying assembly (16)；- an opening/closing element (13) of the second volume (10), which is movable between an opening configuration, wherein the second volume (10) is open for the access to the mixing assembly (9), and a closing configuration, wherein the second volume (10) is closed；wherein the reservoir (4) and the opening/closing element (13) in the closure configuration define an overall upper surface (15) of substantially convex conformation.
