Designation for the decomposition product (therefore also rotting) of organic substances of mainly vegetable waste such as grass, leaves, mulch (mainly wood waste such as branches, twigs, bark), fruit, straw, peat, pomace and weeds, and possibly also animal waste in the form of earth-like substance. Animal excrement products such as manure, slurry or stable manure are added (if at all) in pre-composted form. As a rule, however, these animal waste products are used as own fertilizers. Composting or rotting (rotting) is the controlled decomposition of organic material by micro-organisms(algae, bacteria, fungi) and micro-organisms (woodlice, worms, etc.) with the addition of oxygen. The structural components (such as cellulose etc.) and constituents (such as sugar) of the plants are decomposed. Some of the intermediate products resulting from the decomposition are converted into humus. The admixture of rock flour, sometimes used as an alternative, increases the nutrient content.