hu·mus2 /ˈhjuːməs/ noun [uncountableU] TADLGsoil made of decayed plants, leaves etc that is good for growing plants 腐殖质,腐质土(壤) → compost humus• However, the basic structural principle remains, and the primary constituents are present: air, humus, bacteria and moisture.• The twin-bin system enables humus to be kept in one section, while decomposing materials are housed in the other.• Cultivation: The planting medium should contain a good amount of humus.• Wind and spring floods erode soils, exposing underlying layers and premiering new compositions of humus and minerals on the surface.• They require a fine tilth with plenty of humus and moisture, and are slow growing.• Also the humus from decaying plants is washed down.• I prepared the soil with humus, watered the plants and sprayed with a garlic solution to deter bugs.