A soil probe assembly includes a frame member and a wheel rotatably coupled to the frame member. The wheel includes one or more soil probes that, as the wheel rotates against the earth, the weight of the soil probe assembly drives the soil probes into the earth. The wheel is configured to have at least two planar edges such that, as the wheel rolls onto one of the at least two planar edges, a slamming effect occurs due to the planar edge impacting against the ground, thus causing a soil sample to eject from a soil probe located across the wheel from the ground. The ejected soil sample is collected by a collection hamper. The assembly includes a funnel and a carousel such that the funnel is configured to receive and direct the ejected soil sample to the collection hamper, wherein the collection hamper is coupled to the carousel.