Good Practice Guide - Soil manufacture and habitat creation
Trials have shown that an application rate of 20% by volume is sufficient for woodland establishment
Topsoil manufacture involves the blending of available soils with inorganic and organic materials such as PAS 100 compost to create a fit for purpose soil for the establishment of vegetation.
Manufactured soils often comprise green and/or food derived compost mixed with in situ or imported soils; and depending on the circumstances, other organic and inorganic materials, such as paper mill crumb, bio solids, and/or waste soils, may be incorporated.