I use something similar, but without duct tape or the added poker stick. Just a pipe, cut off at a 45 degree angle. Depending on the size of the tube, it can plant anything from small seeds, potatoes, onion sets, even transplanting tomato starts.
The secret to not plugging the tube, is to put the tube on the ground long end facing away from body, and then use a foot as a fulcrum to press it forward into the ground. For harder ground, I prefer to use metallic pipe over plastic.