Abstract: Method and apparatus for the disinfection of soil. Flames are generated into the soil, at the desired depth and at predetermined distances between them, so as to produce a relatively uniform heating of the soil. The flames are displaced within the soil along desired trajectories to cover any desired agricultural area. Narrow trenches, such as narrow clefts created in already plowed soil, are created in the soil and the flames are advanced along the trenches concurrently with them. The flames may be produced by igniting streams of liquid or gaseous fuel that are continuously fed to the desired depth in the soil.