$4 to $5 thousand if you call that reasonable. and up and up. Not too practical unless you are going into a sideline business. I rented a Vermeer 252 not long ago and got about 20 done in a day for $150. I have a fellow coming over in a couple of days with a big Vermeer on tracks with a 60 HP Cat engine and he is going to do 20 more big ones for $300.
As long as I can rent or get it done for this price I don't believe I will be sinking $5K into one. Give a little more detail of what you are doing and what you plan do do with it after you grind everything in your place.
I actually had pines cut on 3 acres, but now I am just trying to clear 1 acre and prep it for planting. Trees were 8-10 in diameter. It is a mess, but I figure if I can clear the acre of stumps and let mother nature take care of the other stumps on the other 2. I can use the other 2 acres later.
I recieved a quote of $150 per day for a rental. That it probably the way to go. $5000 is far too much. I thought they might be about $1500. Then it would be well worth the investment to have it sit around after I am done.
If you have some time to wait before you remove the stumps use some 28% nitrogen. I've done it by taking a cordless drill and popping some hole in the top of the stump. Fill the holes with 28% and once in a while go back and top the holes up. By the next year the stumps will be rotten enough to chip up with a shovel.
Grampa taught me that trick too but he used a dash of diesel fuel and urea as well. That'll make a stump jump real high.
As for where to find 28%, around here we get it from our local ag-fertilizer dealer. What do local farmers around Martha's Vineyard, Mass. use on their corn? 28% or straight anhydrous?
we aren't oversupplied with corn farmers, but I'll drift by and ask. Most stuff is bought off island in any case. And most farming is organic - don't know if that makes a difference.
I've been off of the farm now for quite a few years so I'm not sure what the organic guys use to get the nitrogen content up in their soils. You could always try a place that sells yard fertilizers. On the bags of fertilizer there is usually a 3 digit code X-X-X. The first number is the nitrogen percentage, the second is the phosphorous and the last is the potassium. Just look for one that has a really high value for the first number and really low for the last two.
Try mixing the fertilizer up with some water and pour the paste in the stump holes. Might be a quick solution instead of hunting down some 28%.