I have several stumps around my new barn, I have been looking for ways to get rid of them. This past week I poured some burnt motor oil on a stump and lit it, thinking that it would burn for just a little while, well 10.5 hours later it was still going! I didnt even drill holes, I just poured it over the top, because i didnt think it would burn very long. I wish now i would have done it right, so Im going to be hunting some burnt motor oil for the rest of them. I know you said that this area was going to be a food plot, but if you drill holes and control how much excess you have running around the stump, ie drilling holes and letting it soak in then add more, I would think most of the oil would burn up and not affect the soil a whole lot. Its worth a try, I know I was surprized.