Yes, it does seem so. Also, though I haven't checked the financial aspects, it seems like it could be done at somewhat low cost, and still be effective to some extent - e.g. not only the machine-driven imprinting, but might be possible to do it manually by humans (using some hand-operated tools, like even just spades/shovels, or something a bit more sophisticated). And that could be decided on a case-by-case basis depending on availability and cost of the human labor vs. cost of the imprinting machine (the tractor with an attachment or whatever it is).