Abstract: A rotary table is provided defining at least three peripherally spaced open-ended vertically extending sleeve-type cavities spaced equally radially outwardly from and about the axis of rotation of the table and a soil receiving chamber is stationarily supported and opens downwardly in a location with which the upper portions of the cavities are successively closely registrable from beneath upon angular displacement of the table. The chamber is disposed at a first stationary station and second and third stationary stations are also defined about the axis in position for registry with second and third cavities of the table when the first cavity thereof is registered with the soil receiving chamber.