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I've been trying the approach to rotting stumps -- I assume that would work better for folks like you in more tropical locations? I rented an auger from the tool lending library and drilled fairly big holes in a stump, and then filled it with cheap high N lawn fertilizer. The problem is that we don't get enough rain to keep the stump soaked, and when it rains it's not warm so I haven't seen much decomposition. But I figure it'd work for you.
The last time I rented a medium size stump grinder. The control switch was damaged and the teeth were not that sharp, so I was not as productive as possible. I was rushing to be able to return the equipment on time on a two day rental, which is why I missed some stuff. It would be nice to have on stump grinder on hand when I have a little project. Is this one better than the DR Grinder?http://www.northerntool.com/shop/tools/product_200512501_200512501
it depends on how much of a hurry you are in. i use a one inch paddle bit drill and ammonium nitrate fertilizer from the feed store. two or three months later, no stump! lots of decomposed wood and bark breaks down into humus. also the roots decompose. a little "rid - x" septic tank activator speeds things up. i sprinkle a little on with the ammonium nitrate.waaaay cheaper (and quieter) than a stump grinder.
zands, one hole or multiple? depends on the size of the stump. drill them nice and deep, that helps with the washing-out. also, there's no rule you cant re-fill the holes. another cupfull of ammonium nitrate's pretty cheap. around here it comes in fifty pound bags. about eight bucks last time i bought any, but that was a while ago. it might be ten bucks by now. like i said, waaaaay cheaper than a grinder. probably cheaper than the gas to run a grinder.