An improved method and apparatus for the jet injection of agricultural liquids into the soil includes a series of jet nozzles, one for each plant row, spaced along the usual tool bar carried by a tractor which normally tows a nurse tank containing the liquid. A pump having an adjustable delivery rate is driven at a rate proportional to ground speed of the tractor, normally by the power take-off of the tractor, to deliver liquid from the nurse tank under substantially constant high pressure. A timing distributor, also driven by the power take-off, connects the high pressure liquid, i.e. the pump output, successively to the nozzles so that the entire output of the pump is concentrated through one nozzle at a time, for a very brief interval, to inject a high velocity slug of liquid which will penetrate the soil to an agronomically satisfactory depth. The timing is such that one slug is injected for each nozzle during a predetermined distance of travel, e.g., 12 inches, to provide a series of equally spaced injections along each plant row.
