Steaming involves applying steam pressure directly onto crop beds and killing weed seeds at soil temperatures ranging from 70-100 degrees Celsius. This method kills most seeds to a minimum depth of 10cm. Problem seeds are hard shelled legumes and clover. It is important not to cultivate soil past the depth of steam application as this could bring deeper laying seeds to the surface. Steaming has shown to be effective for at least two seasons.
Article: DirectWeedControl39 (permalink) Date: 11 February 2013; 3:00:21 PM AEDT