FIG. 1 is a front perspective view of a soil plug sampling device showing my new design;

FIG. 2 is a front view thereof, the unshown opposite rear view being of identical appearance;

FIG. 3 is a side view thereof taken from the left of FIG. 2;

FIG. 4 is a top view thereof; and,

FIG. 5 is an enlarged bottom view thereof.

The broken line showing of the soil plug sampling device is included for the purpose of illustrating portions of the article and forms no part of the claimed design.