Loss of nitrogen by ammonia volatilisation and denitrification after application of urea to maize in Shanxi Province, China
Z. P. Yang A B , D. A. Turner B , J. J. Zhang A , Y. L. Wang A , M. C. Chen A , Q. Zhang A , O. T. Denmead B C , D. Chen B E and J. R. Freney B D
+ Author Affiliations
- Author Affiliations
A Institute of Soil and Fertilizer Research, Shanxi Academy of Agricultural Sciences, No. 64, Nongke North Road, 030031 Taiyuan, Shanxi Province, P.R. China.
B School of Resource Management and Geography, The University of Melbourne, Vic. 3010, Australia.
C CSIRO Land and Water, GPO Box 1666, Canberra, ACT 2601, Australia.
D CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia.
E Corresponding author. Email: delichen@unimelb.edu.au
Soil Research 49(5) 462-469 https://doi.org/10.1071/SR11107
Submitted: 31 August 2010 Accepted: 25 May 2011 Published: 12 July 2011
Abstract
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 NH3were 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 µg 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.
Additional keywords: bLs method, deep placement, fertiliser, micrometeorological techniques.
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