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  • Title: Greenhouse gas emissions from a wheat-maize double cropping system with different nitrogen fertilization regimes.
    Author: Hu XK, Su F, Ju XT, Gao B, Oenema O, Christie P, Huang BX, Jiang RF, Zhang FS.
    Journal: Environ Pollut; 2013 May; 176():198-207. PubMed ID: 23434574.
    Abstract:
    Here, we report on a two-years field experiment aimed at the quantification of the emissions of nitrous oxide (N2O) and methane (CH4) from the dominant wheat-maize double cropping system in North China Plain. The experiment had 6 different fertilization strategies, including a control treatment, recommended fertilization, with and without straw and manure applications, and nitrification inhibitor and slow release urea. Application of N fertilizer slightly decreased CH4 uptake by soil. Direct N2O emissions derived from recommended urea application was 0.39% of the annual urea-N input. Both straw and manure had relatively low N2O emissions factors. Slow release urea had a relatively high emission factor. Addition of nitrification inhibitor reduced N2O emission by 55%. We conclude that use of nitrification inhibitors is a promising strategy for N2O mitigation for the intensive wheat-maize double cropping systems.
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