I would never
root a stump and bury it for one simple reason, sink holes. Livestock can step in them and snap legs and it makes
tractor work even more difficult. I do however bury rocks.
We have a lot of rock walls here so a favorite trick of mine is to take my bulldozer and dig a trench on the down hill side of the rock wall about 5 feet deep, and then push the rock wall into it. Smooth it over with loam, and being below plow-depth, it works quite well. Another trick is to push the big rocks into muddy areas and then drive up on them with the bulldozer. The pounding of the tracks sends the rocks deep into the mud. Cover with loam and again you are good. The only reason I do this is because it saves pushing big rocks ALL the way across a field/pasture. If they are close to edge of the field I am making, I'll just push them aside.
Another trick to clearing a field is to use an excavator/bulldozer combination. Use an excavator to pull the stump in the fall and just leave it on top of the ground. Over winter the dirt freezes and when you use a bulldozer to push the stump to the edge of the field, all the dirt just falls off right where you want it; in your field.
Honestly, I prefer to stump with a bulldozer. With it you can get the stumps out of the ground and to the edge of the field with one machine, as well as smooth your field to a glass like surface when you are done. A Excavator can only get the stump out of the ground. A bulldozer/excavator combination is best, but you must also truck two pieces of equipment to.
Stumps are tricky. Spruce, hemlock and fir are easy and I'll tackle some big ones with my dozer, but big
Ash and White Pine I steer clear of because their tap
roots go down to the center of the earth.
Get the biggest dozer you can afford to hire/rent. You are not taking on a simple stump, you are wrestling weight and it takes sheer weight to stump efficiently. But more importantly, that wide blade is also what gives you a really smooth field when you are done. I use an 850 John Deere if that tells you anything. Its not the biggest John Deere makes, but it is the second biggest.
Don't be put off by a 4 way dozer blade instead of a 6 way. You need to tip the blade from right to left and obviously lift the blade up and down, angling is NOT required. In fact the big dozers often can't. The reason is simple. Set at an angle, you just skid your bulldozer sideways anyway and off the stump.
Some people say cut the stumps high so you have leverage to rip a stump out, but that is wrong. A dozer blade only raises to 4 feet anyway and with an excavator you dig down. To get a stump out, you dig down under it. It is like a piece of glass on a smooth surface with water. You must get under it to help break that suction and when you do, "pop" up it flops out of the earth.
These are the steps to digging out a stump:
Typically a bulldozer tilts more to one side than the other. Approach the stump with the blade tilted fully to that side (typically the right)
Lower the blade deeply about 4 feet before the stump
As the cutting edge starts to rip the roots apart start to angle the blade to flat
As the stump starts to roll up out of the ground start to lift your blade
Lift your blade until it is all the way up
Reverse your machine backwards until you can get under the stump again
Go forward, hitting the root ball flat on
Lift the blade about 1 foot off the ground all the way to the edge of the field so you do not lose your precious top soil
I know how to make pastures/fields. Everything in this 12 acre field was forest 6 years ago.