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Macroscien said..
The main problem is that almost all trees I saw half a year ago - regrow already. Some have aleady branches 3 -4 meter tall and 8 cm diameter.
If cutting vertical lines prevent regrowth? Or I need to use some chemicals to kill stump and roots ?
To kill and rot out stumps, you can use "stump destroyer" [pretty much pure potassium nitrate - an oxidiser]
Last I checked it was still sold in QLD in small quantities labelled as above.
Back in the day, I used to buy 50kg bags of potassium nitrate from David Grays for [iirc] around $40ish, but there are probably legal restrictions on how much you can buy these days.
All you do is drill lots of holes in the stump with an extended spade bit, pour in the powder, dampen it, then cover the stump to let the stuff work for a few months.
The stuff will greatly accelerate the natural rotting process of the stump, usually, after a couple of months the timber has all the strength of cheese and is easy enough to hack out.
Sometimes, depending on the size of the stump you may need to retreat unaffected timber deep inside the remains of the stump.
If [like me] you don't have the patience to wait several months - light up the stump with scrap timber and a little diesel, when the fire settles down a bit, chuck a handful of the powder onto the stump - and watch as the dissolver eats into the stump while sounding like a turbine


don't stand too close - as the radiated heat can get pretty fierce.
repeat every so often until your stump is burnt out.
I have used this stuff to burn out stumps which were so recently cut that there was water and sap still oozing out of them.