compost

A dark amorphous material, the end product of the decomposition of organic matter (when kept separated from the soil in a heap or bin). Compost is added to soil as a soil improver, increasing soil organic matter and improving soil structure.

carbon:nitrogen ratio,
compost accelerator,
compost tea,
decomposition,
humus,
leaf mould,
organic matter,
PAS 100,
soil improver,
soil organic matter,
soil structure

This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
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