Abstract: An apparatus and process applying herbicide-containing liquid to weeds in a field also containing growing cultivated crops neighboring said weeds comprises means for moving an apparatus that transports a load of herbicide-containing liquid in a reservoir therefor along that field and then distributing that liquid from that reservoir to a weed-contacting surface: the pressure-controlled liquid reservoir provides the herbicide-containing liquid to any array of dispenser units arranged to rapidly and reliably and selectively and efficiently apply such herbicide-bearing liquid to the surface of weed plants in the field projecting above a neighboring cultivated crop without misapplication of such herbicide-containing liquids to such neighboring crops.