Tôn Thất Chiểu, Lê Thái Bạt (trang 36-41, 35)
Từ khoá: nghiên cứu, đất, Trà Lĩnh, Cao Bằng, phương pháp định lượng
Investigation of soil resources in Tra Linh district, Cao Bang province following quantitative soil classification approaches
Soil resources consists of 7 major soil groupings, 12 soil units and 32 soil subunits. Suitable areas for annual crops and perennial crops occupy 10-53% and 13.6%, respectively. Main types of land degradation are drought, soil erosion, leaching, monoculture, shifting cultivation, low ratio of land use coefficient.