It is assessed that 15% of the soil in Kosovo is high quality soil, followed by 29% of medium quality, so 56% of all soil is poor quality soil, while the high and medium quality make up 44% of the soil in Kosovo.[14] The high and medium quality soil is composed 11% by humus soil, 8.4% grey carbonate land, 7.8% alluvial soil, and other dark and serpentine soils.[14] The poor quality soil is composed of diluvial lands, swamps, acidic grey soils and other infertile soils, and it mainly lies on hilly areas and mountains.[14]