
Topdressing has long been practiced to improve soil structure and drainage
and encourage microbial breakdown of thatch buildup. Recent studies and
trials have demonstrated even greater benefits from applying composted materials
as a topdressing, including improved resistance to turf diseases and an increase
in the soil fertility, resistance to compaction, and the diversity of beneficial
soil organisms.
What about adding topsoil? Commercial "topsoils" are
usually a mixture of compost and subsoils of varied origin. They may
contain invasive weeds, inadequate or toxic levels of some minerals, or be
structurally incompatible with your existing soil. In general it is better
to buy and use a Grade A compost.
For clay soils: The addition of sand to clay soils is not
recommended, because it may create a concrete-like structure. We recommend
using compost and mulching your lawn.
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