Abstract
The partial sterilization of soil in raised beds in glasshouses is frequently carried out by a method known as sheet steaming. Some measurements taken during the routine steaming of six beds show that the depth of heat penetration by this method is variable. At a depth of 2 in (51 mm) the process was consistent, but at a depth of 6 in (152 mm) the process was less reliable, there being a reduced rate of heating and lower soil temperatures. During the 5–6 h duration of the treatment up to 2 1 2 times more steam was supplied than would be required with a steam injection method such as Hoddesdon pipes. An initial steam supply rate of at least 3 lb h −1ft −2 (4·07 g s −1 m −2) of bed should be allowed.
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