Easy way to sterilize soil for re-use.
If you want to re-use potato soil (as from potato bins), or other specially made soil as well, you can sterilize it with boiling water. How to do this is explained in the Storey Bulletin "Potatoes, Irish and Sweet" -- Storey Publications in Vermont (around page 21, if I remember right). 5 gallons of boiling water will sterilize about half of the soil that I store in a 55 gallon drum, so about 25 gallons of soil. My potato soil is too specialized (low pH) and costly (contains vermiculite) not to re-use it!