Abstract: Disclosed is an apparatus for and a method of soil sterilization to control undersirable biotica resident therein. The apparatus for soil sterilization includes a shielded chamber with a baffled inlet and a baffled outlet formed on side walls thereof. Means for generating electromagnetic energy in the gamma region is provided, and the rays emitted therefrom are contained within the shielded chamber. A conveyor means such as a conveyor belt continuously and sequentially conveys portions of unsterilized soil from a tillable field into the baffled inlet, then through the energized chamber, and thence out of the baffled outlet. After exposure to the gamma rays contained within the chamber, undesirable biotica resident in the unsterilized soil are significantly reduced by death and morbidity.