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Term for the decomposition product (therefore also rotting, from rot = to rot, modernise, decompose) of organic materials from predominantly plant waste such as grass, leaves, mulch (largely wood waste such as branches, twigs, bark), fruit, straw, peat, pomace and weeds, as well as animal waste in the form of soil-like substance. Animal excrement products such as manure, slurry or slurry or stable manure are added in pre-composted form.

As a rule, however, these animal waste products are used as fertilisers in their own right. Composting or rotting is the controlled decomposition of organic material by microorganisms(algae, bacteria, fungi) and microorganisms (woodlice, worms, etc.) with the addition of oxygen. The structural components (e.g. cellulose etc.) and ingredients (e.g. sugar) of the plants are broken down. Some of the intermediate products produced during decomposition are converted into humus. Alternatively, the addition of rock flour increases the nutrient content.

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