The invention relates to portable hand-operated agricultural sprayer featuring two modular chemical containers for sequential use in the application of chemicals on agricultural crops or on weeds with application in agriculture. The sprayer is equipped with shoulder straps (3) for securing on operator's back and consists of two modular containers assembled to one another, respectively first container (1) for herbicide and second container (2) for herbicide neutralizer. On the openings of the containers (1, 2) there is a cap for herbicide (4) on which there are air valves (5, 8) and finned connectors (6, 9) to which are connected the first flexible hose for herbicide (10) and the second flexible hose for herbicide neutralizer (11) each of which is equipped with first valve (13) for herbicide and second valve (14) for herbicide neutralizer. Each of the valves (13, 14) is connected to a lug (15) and to the first tube (24) is attached second tube (25), the first tube (24) being connected via the first valve (13) to the first flexible hose for herbicide (10), and the second tube (25) being connected via the second valve (14) to the second flexible hose for herbicide neutralizer (11). At the ends of these tubes (14, 25) are located the first nozzle for herbicide (28) and the second nozzle for herbicide neutralizer (29) mounted on tubular housing (27); the diameter of the opening of each nozzle is between 0.5 and 1.2 mm, the nozzle length is between 18 and 32 mm, and the wall thickness is between 0.1 and 0.5 mm. The first modular container (1) is tightly fit to the second modular container (2) using wedged grooves (32) and protruding wedge ridges (33). The first valve for herbicide (13) and the second valve for herbicide neutralizer (14) are located within the housing (19) in which is installed the plunger (20) with spring (17) closed on top with mounting cap (18), the lower end of the plunger (20) being in contact with arm (21) on the lug (15) attached using hinge (23) to the trigger assembly (12). The first tube (24) and the second tube (25) are designed as telescopic tubes inside which by means of screw connectors (26) is installed telescopic tip (31) consisting of first telescopic tube (32) and second tube (31). At the end of the first telescopic tube (32) and the second telescopic tube (31) are located respectively the first nozzle (28) and the second nozzle (29). The telescopic tip (31) is extendable as needed to the desired length using the screw connector (26).