Journal of Food, Agriculture and Environment

Effects of nitrogen and soil moisture on nitrous oxide emission from an alfisol in Wuhan, China

Author(s):

Weihong Qiu, Jinshan Liu, Chengxiao Hu *, Xuecheng Sun, Qiling Tan

Recieved Date: 2010-07-20, Accepted Date: 2010-11-04

Abstract:

Soil moisture and nitrogen fertilizer are the key factors affecting nitrous oxide (N₂O) emission from agricultural croplands. The aim of this study was to ascertain the relationship between N₂O emission with soil moistures (35%, 60%, 85% and 110% WFPS) and N fertilizer rates (0, 0.2, 0.4 g N kg^-1) in alfisol. A laboratory experiment was employed and emissions of N₂O were measured regularly over a 61-days incubation period. N₂O emissions were significant affected by soil moisture and the largest N₂O emissions were occurred at 85% WFPS with a total 6.4, 10.4 mg kg^-1 from N₁, N₂, respectively, represented 3.1% and 2.6% of N applied. N₂O emisssions from dry soils (35% and 60% WFPS) were relatively low in this study. Nitrogen application significantly affected the N₂O emission and soil moisture is the main factor in producing N₂O emissions under a certain nitrogen fertilizer rate. The results demonstrate that it is very important to manage the nitrogen fertilizer rate and soil water when vegetables are planted in the alfisol.

Keywords:

Greenhouse gas, nitrogen applied rate, nitrous oxide, soil moisture, water-filled pore space

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Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 3&4
Category: Agriculture
Pages: 592-596

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