Loss of nitrogen by ammonia volatilisation and denitrification after application of urea to maize in Shanxi Province, China

文献类型： 外文期刊

第一作者： Yang, Z. P.

作者： Yang, Z. P.;Turner, D. A.;Denmead, O. T.;Chen, D.;Freney, J. R.;Yang, Z. P.;Zhang, J. J.;Wang, Y. L.;Chen, M. C.;Zhang, Q.;Denmead, O. T.;Freney, J. R.

作者机构：

关键词： urea: 57-13-6;nitrous oxide: 10024-97-2;nitrogen dioxide: 10102-44-0;acetylene: 74-86-2;inhibition;nitrogen: 7727-37-9;agrichemical;fertilizer;denitrification;volatilisation;ammonia: 7664-41-7;denitrification;volatilisation;soil core;fertiliser use efficiency

期刊名称：SOIL RESEARCH （ 影响因子：1.987； 五年影响因子：2.47 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Much of the fertiliser nitrogen (N) used in agriculture is lost to the atmosphere as nitric oxide and nitrogen dioxide (collectively referred to as NOx), ammonia (NH3), and nitrous oxide (N2O). The lost N is not only an economic problem for the farmer; it also contaminates the environment and affects human health. Because the values obtained for NOx and NH3 loss to the atmosphere from agriculture in Monsoon Asia have been questioned, we quantitatively determined, using new techniques, the emission of these gases from a maize crop fertilised with urea in northern China. The fertiliser was deep-placed by traditional farmers' practice and emissions of NOx and NH(3)were determined with a chemiluminescence analyser and a backward Lagrangian stochastic dispersion technique. The emission measurements indicate that 1.2% of the applied N was lost as NOx. This loss is far greater than measured or derived by other researchers, and we suggest that this is because our measurements were made continuously rather than as spot measurements with static chambers. The results for NH3 show that, although the fertiliser was placed below the soil surface, a small amount (7% of the applied N) was still lost to the atmosphere. Soil analyses indicate that the rate of nitrification in this soil was low, and the maximum nitrate (NO3-) concentration found in the soil (31.4 mu g N/g) was only 3.9% of the fertiliser N added. Thus, there is little potential for NO3- to be leached down the profile. A study using soil cores and acetylene inhibition to measure denitrifying activity suggested that the rate of denitrification in this soil was also very low. The results suggest that in this soil with slow nitrification and denitrification rates and little potential for leaching, deep placement of the urea to limit NH3 volatilisation is an effective method for increasing fertiliser use efficiency.

分类号： S1

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