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尿素是农业生产上施用很广泛的氮素肥料。据研究,水田的当季利用率很低,一般为20～30%。中国农科院土肥所在(土娄)土和黄绵土上进行试验、水田尿素利用率为24.5%和26.6%。大部份肥料氮以不同的形式损失。朱兆良1982年用~(15)N 测石灰性水稻土中尿素施用损失约50%左右。这些损失的氮素,不仅造成浪费,增加农民施肥的投入,而且污染水源、空气,还对土壤理化性状有不良影响。在我省生态条件
Urea is a widely used nitrogen fertilizer for agricultural production. According to the research, paddy field seasonal utilization is very low, usually 20 to 30%. Soil and Fertilizer Institute of Chinese Academy of Agricultural Sciences where (Lo soil) and loessial soil experiments, paddy Urea utilization was 24.5% and 26.6%. Most fertilizer nitrogen is lost in different forms. Zhu Zhaoliang in 1982 with ~ (15) N measured calcareous paddy soil urea application loss of about 50%. These losses of nitrogen not only cause waste and increase farmers’ input in fertilization, but also pollute the water and air and adversely affect the physical and chemical properties of the soil. Ecological conditions in our province