【摘 要】
：
在上海郊区首次应用微气象学方法测定了尿素施于栽培甘蓝田间后的氨挥发损失。尿素用量225公斤/公顷。尿素分100%表施与尿素70%混施于土层(另30%表施)两处理。连续11天累计的
【机 构】
：
上海市农业科学院土壤肥料研究所,上海市农业科学院土壤肥料研究所,上海市农业科学院土壤肥料研究所,上海市农业科学院土壤肥料研究所,澳大利亚联邦科学与工业研究组织,澳大利亚联邦科学与工业研究组织,澳大利亚
论文部分内容阅读
在上海郊区首次应用微气象学方法测定了尿素施于栽培甘蓝田间后的氨挥发损失。尿素用量225公斤/公顷。尿素分100%表施与尿素70%混施于土层(另30%表施)两处理。连续11天累计的氨态 N 挥发损失显著,分别为39.2公斤/公顷和25.0公斤/公顷,或尿素施用量的17.4%和11.1%。其损失量大小,与土壤水分,土壤 pH 和尿素施用深度等密切相关。试验期间,0—5cm土壤中的尿素浓度随试验时间延长而减少;氨态 N(NH_4~+ + NH_3)则随试验时间延长而增加。研究结果表明,把大部分尿素混施于耕层的方法,将能明显提高肥效。
In the suburbs of Shanghai for the first time the application of micro-meteorology method was measured urea fertilization in cabbage field ammonia volatilization loss. The amount of urea 225 kg / ha. Application of urea in 100% table and urea 70% mixed in the soil (another 30% table Shi) two treatment. The cumulative NH3-N loss over the 11 consecutive days was significant at 39.2 kg / ha and 25.0 kg / ha, respectively, or 17.4% and 11.1% of the urea application. The amount of loss is closely related to soil moisture, soil pH and urea application depth. During the experiment, the concentration of urea in 0-5cm soil decreased with the prolongation of test time. The ammonia nitrogen (NH_4 ~ + NH_3) increased with the prolongation of test time. The results show that the method of applying most of the urea to the topsoil can obviously improve the fertilizer efficiency.
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