Nguyễn Quốc Hải*, Trần Thị Tâm*
*Viện Thổ nhưỡng Nông hoá
Từ khoá: ảnh hưởng, băng cây xanh, phân khoáng, năng suất, lúa, đất nương, miền núi phía Bắc
Influence of hedgerow and inorganic fertilizer to rice yield on permanent agricultural upland area of the northern mountainous region
Research was in Ha Giang on permanent agricultural upland area with slope of 10o-15o and poor nutrient (2000-2003), including 2 experiments designed with 3 treatments per one with 300m2 per plot without replication and having four (4m2) randomized sites for statistical procedure. Results after 4 years of study: soil loss was decreased, rice yield increased from 11.5 to 19.0% and organic matter improved. In two types of hedgerow, veiler hedgerow has better erosion resistant capacity and higher yield than that of Tephrosia one. Using inorganic fertilizer maintained and increased considerable rice yield (53.4 to 66.9%) and benefit as the same time improved some soil nutrient.