[dcarch]

I hope I am not stealing this thread:

Here is what I havew been doing: for maximum effect, if heat is to be considered to treat soil:

1. My raised bed is insulated with 1 1/2 foam.
2. I cover the soil with double layer of clear polycarbonate plastic panels to gain solar heat and prevent heat loss.
3. Near the end of solaring the soil, when the soil is quite warm already from the sun, on a warm day, I pour boiling water into the soil. In most areas, the energy to boil water on a stove is much cheaper than electric heat and it carries the heat very deep into the soil. The combined heat of already hot soil from solar heat and boiling water is much more effective than either one alone.

I do this not to control RKN, which is not a problem in my area, I do it to kill roots from nearby trees and weeds.

BTW, I still get plenty of worms afterwards.

dcarch