Nguyễn Công Vinh, Thái Phiên (trang 136-145)
Từ khoá: cân bằng, dinh dưỡng, nông lâm, đất dốc
Nutrient balance in slopping land affected by the different cultivation practices in Luong Son district, Hoa Binh province
Soil types in research are strongly weathered red-yellow soils. Upland rice, beans are common practices of farmers in upland. Soil erosion has serious disturbance to the soil fertility. Soil erosion was 13-85 tones/ha/year and 887-17,000m3 of runoff/ha/year. Soil erosion is the main reason leading to the degradation on slopping land. The nutrient balance in terms of N, P, K was negative in the first 2 years of experiment, but in the next 2 years, the nutrient balance was improved remarkably by crop residues returned to the soil.