Abstract
Due to the high cost and scarcity of labour, glasshouse growers have in recent years shown more interest in the use of mobile steaming grids as an effective method of soil sterilizing with a low labour content. This report describes experiments and trials concerned with the development of a grid capable of treating soil to a depth of 16–18 in (0·4–0·45 m) at a speed of 25 ft/h (8 m/h). The design of the sub-surface parts combines perforated tubes, in which the hole spacing is irregular, with a transverse horizontal blade which produces soil conditions suitable for the rapid sideways distribution of steam. The performance details of the grid are presented together with the theoretical steam requirements for sterilizing. Details are given of some suitable methods of anchorage for the winch unit. The safe operation of mobile grids is considered and various precautions which may be taken are suggested.
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