I found this:

the stump can be killed as follows: Bore holes at a slanting angle around
the top of the stump. The holes should be about one and one-half inches in
diameter and from eight to ten inches deep.


Just how are we drilling holes that size these days ?



Fill them with salt peter (nitrate of potash) or a commercial stump-killing
product. The material will spread through the stump and prevent sucker
growth from appearing. If the stump has green foliage growth on it now, you
can apply a Blackberry Vine or Brush Killer to the foliage as a first step.
Be sure this material does not touch any desirable vegetation, except the
plant suckers you are trying to destroy. Read and follow label
instructions.


You can get a "speed-bore" bit at HD or Lowe's or any hardware store for
1 1/2". They work great in a 1/2" drill motor. If all you have is a 3/8"
variable speed drill motor, begin by using a slower speed, then increase
speed as you go deeper.

BTW, since the post has returned an abundance of votes for using
RoundUp, why not save yourself a lot of money and use a product called,
"Remuda", from Monterey Lawn & Garden. Here in San Diego, RoundUp costs
$90 a gallon; Remuda costs $44.

When the patent ran out on Monsanto's formula, Monterey picked up the
ball and made the same stuff. Sew the link below:

http://search.atomz.com/search/?sp-q...1ee-sp00000002