Characteristics of Nitrogen Cycling in Farm Systems in a Small Watershed of Three Gorges Reservoir Area,China
三峡库区小流域农户氮循环和排放特征

In China,the agricultural activities are often carried out by single family,and the balance of nitrogen in every farm may have great effect on agricultural production and environment.A farm survey was carried out on the amounts of chemical fertilizers consumed,the amounts of food and feed purchased,and the livestock manures used in Zhangjiachong watershed of Three Gorges Reservoir Area for each farmer.According to the characteristics of nitrogen flow,farms in this watershed could be divided into 5 types: br...