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Magically speaking, Saltpeter has a long, long, long history in hoodoo as an agent of magical protection in spritual baths and floor washes and as a shoe-sprinkle. Also, because it is an ingredient in Gunpowder, it is used in formulae which are hoped to produce quick (explosive) action, such as Block-Buster.
Therefore, salt is better used to kill weeds in areas without other vegetation: driveways, sidewalks and so forth. In this case, dissolve 1 cup of salt to 2 cups of boiling water. Then, spray the salt mixture onto the weeds. Another option is to take a pinch of salt and apply it to the base of the weed.