【作者】 熊又升； 陈明亮； 吕国安； 喻永熹； 邓波儿； 熊桂云； 巴瑞先； 乔艳；

【Author】 Xiong Yousheng Chen Mingliang Lu Guoan Yu Yongxi Deng BoerXiong Guiyun Ba Ruixian Qiao Yan ( Huazhong Agricultural University Wuhan Hubei Academy of Agricultural Science)

【机构】 华中农业大学资源环境与农业化学系； 湖北省农科院土壤肥料研究所；

【摘要】 采用土柱淋洗试验,模拟降雨条件下两种质地石灰性土壤中包膜尿素、尿素和硝酸铵的氮素形态转化和迁移规律。结果表明:经过25天1750ml蒸馏水分7次间歇淋洗,三种氮肥在土壤中氮素转化和迁移的主要形态是NO₃^-N。包膜尿素的总氮回收率90.5％～91.2％,以颗粒肥料形式残留在土壤中占使用量的62.7％～70.8％;尿素和硝酸铵的总氮回收率分别是53.1％～76.8％和89.2％～95％;三种肥料在土壤中的残留吸附量均不到使用量的4％。由此说明包摸尿素在土壤中保氮供氮持续时间较长,尿素挥发损失可能较高,硝酸铵淋失较快。更多还原

【Abstract】 Soil column leaching test was used in modeling the transformation and movement rules of N forms from urea, coated urea and ammonium nitrate in Calcic soil of two kinds of textures under rainfall. The experimental results demonstrated: the major form of transformation and movement from three varieties of N fertilizers in soils was NO3-N through 1 750ml/7times intermittent leaching and dry cycles in 25 days. The N cumulative recovery of coated urea was 90.5% -91.2%, The rate between the residual N amount in soils as fertilizer granulation and application N was 62.7% - 70.8% ; the sum of recovery of urea and ammonium nitrate were 53.1% - 76.8% and 89.2% - 95% , respectively; the residual N amounts of three varieties of N fertilizers in soils were less than 4% .These results testified that the lasting time of retaining and supply N of coated urea in soils was longer , volatilization loss of urea was higher and leaching loss of ammonium nitrate was quicker.更多还原