Abstract: The present invention relates to a soil injection apparatus in which a probe having on insertion tip is inserted into the soil. A pair of probe guide assemblies are positioned adjacent each side of the probe to provide stability of the probe and prevent breaking of the probe. A probe hydraulic system extends and retracts the probe from the soil. A liquid pumping system pumps liquid into an outlet of the probe after insertion of the probe into the soil. A control system activates the probe hydraulic system and liquid pumping system. Preferably, a switch is used to activate the pumping system to pump liquid into the soil after the probe has been inserted a predetermined depth into the soil. The soil injection apparatus can be attached to a self-propelled vehicle. A carrier can be attached to the vehicle for holding debris removed from the soil injection site.