脲醛缓释肥料棒氮素缓释特性研究
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海南省财政科技计划(ZDYF2018088);中国热带农业科学院基本科研业务费专项(No.1630022017007);现代农业产业技术体系建设专项(No.CARS-34)。


Study on nitrogen slow release characteristics of urea formaldehyde slow release fertilizer rods
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    摘要:

    以脲醛缓释肥料棒为研究对象,测定了其密度、压缩比以及抗压强度,并通过室内间歇式土柱淋溶试验,研究了脲醛缓释肥料棒氮素淋出特性及其氮素累积淋出率曲线方程拟合。结果表明,随着脲甲醛用量增加,缓释肥料棒密度、压缩比及抗压强度逐渐减小;脲醛缓释肥料棒可明显减少氮素淋失,随着脲甲醛用量增加,氮素累积淋出率减小,并且一级动力学方程对脲醛缓释肥料棒的氮素累积淋出率曲线拟合效果最佳(r=0.967**~0.998**,SE=0.94%~3.85%),可用于表征氮素累积淋出率与时间的关系。第42 d淋溶时,脲甲醛氮量占缓释肥料棒总氮0、25%、50%、75%的脲醛缓释肥料棒FR、UFR1、UFR2、UFR3的氮素累积淋出率分别较普通肥料减少了21.93%、49.46%、61.34%、82.90%。表明脲醛缓释肥料对氮素具有较好的缓释效果,且随着脲甲醛用量增加,缓释作用增强。

    Abstract:

    With urea formaldehyde slow release fertilizer rods as the research object,its density,compression ratio and compressive strength were measured,the nitrogen leaching characteristics was studied and the fitting effect of nitrogen accumulated leaching rate was simulated by intermittent soil column leaching experiment.The results showed that with the increasing of urea formaldehyde,the density,compression ratio and compressive strength decreased.The urea formaldehyde slow release fertilizer rods obviously reduced nitrogen leaching,and the nitrogen accumulated leaching rate decreased with the increasing of urea formaldehyde.Nitrogen accumulated leaching rate curve could be best simulated by first order kinetics equation(r=0.967**~0.998**,SE=0.94%~3.85%).Compared to ordinary fertilizer,the nitrogen accumulated leaching rate of FR,UFR1,UFR2,UFR3(ureaformaldehyde nitrogen accounts for 0,25%,50%,75% of total nitrogen in slow release fertilizers,respectively)decreased by 21.93%,49.46%,61.34%,82.90% at the 42nd days,respectively.They indicated that urea formaldehyde slow release fertilizer rods had good effect on nitrogen slow release,and with the increasing of urea formaldehyde,the slowrelease effect increased.

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林清火,刘海林,杨凯,华元刚,茶正早,罗微.脲醛缓释肥料棒氮素缓释特性研究[J].中国土壤与肥料,2018,(4):153-158.

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  • 在线发布日期: 2018-08-17
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