中国农业科学 ›› 2008, Vol. 41 ›› Issue (5): 1383-1389 .doi: 10.3864/j.issn.0578-1752.2008.05.016

• 土壤肥料·节水灌溉·农业生态环境 • 上一篇    下一篇

包膜尿素氮素的溶出特性研究

张玉玲,张玉龙,党秀丽,虞 娜,岡本昌広   

  1. 沈阳农业大学土地与环境学院/辽宁省农业资源与环境重点实验室
  • 收稿日期:2007-08-12 修回日期:2007-12-24 出版日期:2008-05-10 发布日期:2008-05-10
  • 通讯作者: 张玉龙

Resolution on the Liquation Character of Nitrogen from Coated Urea by Reaction Rate Theory

Yu-Ling ZHANG Yu-Long ZHANG Xiu-Li DANG Na YU Masahiro Okamoto   

  1. 沈阳农业大学土地与环境学院/辽宁省农业资源与环境重点实验室
  • Received:2007-08-12 Revised:2007-12-24 Online:2008-05-10 Published:2008-05-10

摘要: 【目的】研究包膜尿素(LP 30)氮素的溶出特性。【方法】采用土壤、纯水两种培养方式,在4种温度(10、15、20、25 ℃)条件下对不同培养时期氮素溶出率进行测定,利用具体的方法——The number of days transformed to standard temperature(DTS),对自然温度条件下氮素的溶出率进行预测。【结果】培养试验表明,土壤和纯水两种培养方式对包膜尿素氮素溶出率的影响很小,不同温度对氮素溶出率的影响显著。分析表明,一级反应动力学模型可很好地描述包膜尿素氮素的溶出过程。氮素溶出速率随温度升高而加快,在10~25℃内,每升高5℃,速率常数约提高1倍左右。包膜尿素埋藏土壤后实测的氮素溶出率值与采用DTS法预测的氮素溶出率值之间无明显差异。【结论】包膜尿素(LP 30)氮素溶出率大小主要取决于温度的变化,DTS法能较准确地预测包膜尿素施入土壤后,自然温度条件下,任意天数的氮素溶出率。

关键词: 包膜尿素, 氮素溶出特性, DTS法

Abstract: The nitrogen liquation of coated urea(LP30)were resolved based on reaction rate theory with culture experiment method under different temperatures. The results showed that the nitrogen liquation of coated urea(LP30)could be obeyed to the first-order reaction model. Liquation rate constant(k)was dependent on temperature. When the liquation rate constants changed from 0.0081~0.0425, activation energy was 75733 J.mol-1 in range of 10℃~25℃.The days of temperature switch method could apply and estimate the liquation amount of coated urea based on reaction rate theory in natural conditions.

Key words: Reaction rate theory, Days of temperature switch(DTS), Coated Urea, Liquation character