Lowther Tree Planter Modified for Silt and Clay Soils
The Lowther tree planting machine plants trees well in light sandy soils. In heavy soils, such as silts and clays, the wedge-shaped trencher of the Lowther compresses the soil laterally with a greater force than the packing wheels can exert to replace the soil around the roots of the planted tree. This results in an open slit with the roots of the trees dangling in a pocket of soil air.
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Author(s): E. F. Johnston
Publication: Tree Planters' Notes - Issue 28 (1957)