Abstract: An apparatus for roadside spraying of herbicides or other liquids in a manner which ensures uniform application of the herbicide without resorting to atomization of the sprayed liquid. The apparatus provides means for uniformly applying the herbicide in a plurality of swaths at different distances from the spraying apparatus. The apparatus uses a means for vibrationally altering the directions of the sprayed liquid streams to ensure uniform coverage. The direction altering means allows the amplitudes of the direction alterations to vary in accordance with the target distance of sprayed liquid stream.

Abstract: A fluid delivery system (10) is provided for delivering at least one chemical (26) onto a field in a desired concentration. A carrier fluid (67) is provided for diluting the farm chemical (26). The mixture is pumped through a spray boom (18) onto the field by a main fluid pump (74). The chemical (26) is delivered to the inlet port (76) of the main fluid pump (74) by a chemical pump (54). The chemical pump (54) is operated by a variable speed stepping motor (56). The speed of the stepping motor (56) is controlled by a speed sensing wheel (88) to provide a uniform concentration of chemical on the field independent of vehicle speed. The motor speed is also controlled by a thumbwheel switch (116) to deliver a desired concentration on the field compensating for drive vehicle wheel slippage. The motor speed is also adjusted to calibrate the delivery concentration to the nozzle pattern through calibration switches.