none of the chemical methods that would work would be either safe nor cheap. Not to mention soil contamination

if you can burn it out, that definitely works - be aware the fire will burn for about 3 days underground and follow the roots. suitable for the countryside in winter, but less so for suburban housing.

cutting digging and manually removing the stump is probably the cheapest option if your labour is free. high pressure water helps a lot if there is drainage, or a sump pump.

explosives work... but are also not cheap, and not suitable for an urban environment.

WRT aggregate - you really want angular rock for interlocking and stability. Consider recycled brick - cheaper than road agg, has similar properties.

without knowing the specifics of the problem, I can't advise better.

On Sun, Jan 8, 2017 at 9:51 PM, Mark Trickett via luv-talk <luv-talk@luv.asn.au> wrote:

Hello All,

I have several willow tree stumps that I wish to remove. As they are
in ground where I want to put the footings for a carport, and wish the
ground relatively undisturbed, I do not want to dig them out, or have
them ground up. I do know that Nitric Acid will convert the cellulose
to cellulose nitrate, gun cotton, but I am looking for a way to not
have all the cellulose to go that way, I want it to burn, not go bang.

I have read somewhere about a suitable mix poured into holes drilled
into the stump, and I do recall the Nitric acid, and that there was
something else. If anyone can make suitable suggestions, or point to
the process, I would be very grateful.

Regards,

Mark Trickett
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Dr Paul van den Bergen