I've heard of boreholes, and packing in powdered milk. I don't know if that
helps.

Saltpeter is potassium nitrate. Though, they are very similar in their
effect.

--

Christopher A. Young
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"William W. Plummer" wrote in message
...

In the old days we would use a brace and bit to bore 1 inch holes in the
stump. These would be filled with sodium nitrate (aka "saltpeter").
Several months later, the stump could be burned out.