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作 者 ：刘增兵, 赵秉强, 林治安

期 刊 ：植物营养与肥料学报 2010年 16卷 1期 页码：208-213

关键词：熔融造粒；腐植酸尿素；氨挥发；脲酶活性；溶出率；铵态氮；

Keywords:ammonia volatilization, urease activity, leaching rate, NH+4-N,

摘 要 ：采用室内模拟，研究了腐植酸尿素在土壤培养条件下其氨挥发特性及其与土壤脲酶活性、氮溶出率以及土壤铵态氮、硝态氮含量变化的关系。结果表明，研制的4种腐植酸尿素氨挥发量分别比普通尿素降低了48.14%、 47.99%、 30.89%、 59.22%，其中水溶性腐植酸含量11.78%的腐植酸尿素降低最多。腐植酸尿素降低氨挥发量与其养分释放模式和形成的土壤环境密切相关。土壤氨挥发总量与脲酶活性在培养前期相关系数较高，培养48和96 h分别达到0.825和0.808； 土壤氨挥发总量与肥料累积溶出量相关系数为0.903； 培养前期，土壤氨挥发量与铵态氮含量相关系数达到0.869。

Abstract:Behaviors of humic acid compound urea in soil were studied under laboratory conditions. Results show that compare with common urea, the total ammonia volatilization from four humic acid compound urea fertilizers were decreased by 48.14%, 47.99%, 30.89%and 59.22%, among them the compound urea with water soluble humic acid content being 11.78%decreased most. The ammonia volatilization reduction of humic acid urea correlated significantly with its nutrient-release mode and soil ambient. The total ammonia volatilization correlated significantly with soil urease activity during initial period of incubation, the correlation coefficient between total ammonia volatilization and soil urease activity was 0.825 and 0.808 for the fertilizer incubated for 48 hours and 96 hours, respectively. The correlation coefficient between total ammonia volatilization and N leaching rate was 0.903. The correlation coefficient between total ammonia volatilization and content of NH⁺₄-N was 0.869 at the initial stage of incubation.

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