Loading ...i get it in the 50 pound bag at the feed store. they don’t keep track of it. if i were buying 500 pounds at a time, they might. they know me there, i buy other garden supplies, vet stuff for the dogs, hardware etc.
ammonium nitrate also works on stumps. drill some holes, fill with the ammonium nitrate, and the stumps rot in situ in a few months. add more chemical every month or two if the rain washes it out of the holes.