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Atmospheric nitrogen wet deposition and nitrogen volatilization in Chinese chive planting field of a typical agricultural area at northern bank of Dianchi Lake |
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Abstract One–year monitoring study was conducted to estimate wet N deposition to in Chinese chive planting field of a typical agricultural area at northern bank of Dianchi Lake. Nitrogen volatilization was also investigated in soils of Chinese chive planting fields, in situ field Chinese chive decomposition, and in ditch sewage water. The total wet N deposition was 7.1kg N/hm2 in 2007, about 89% of N deposition occurred during the rainy season of April to September. The cumulative ammonia volatilization loss 35days after N fertilization accounted for 25% of supply N as urea (345 kg N/hm2), about 96% of ammonia volatilization loss occurred during the first 9days after N fertilization. The cumulative N volatilization loss accounted for 27%~38% of total N in the ditch sewage water containing 7~51mg N/L (2.7~25.8mg N/L as NH3-N) within open storage for 12days. Therefore, nitrogen volatilization in Chinese chive planting fields could be one of important sources of atmospheric nitrogen in the present investigation area.
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Received: 04 February 2010
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