Pramitol is what I have used in the past to sterilize a limestone driveway to prevent grass/weeds from growing between the tire paths.
works very well. I got a gallon of concentrate from a friend who farms rice and uses it along right of ways. I don't know if you have to be licensed or not but I did see some at Chastant Bro's feed store in Lafayette a few weeks back. Definitely scorched earth policy for a year!
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