The main GHGs in wheat and maize cropping systems are N2O and CO2. In the case of N2O, N fertilizers are a significant direct source of emissions of this gas in the field and an indirect source through fossil fuel energy consumption associated with manufacturing and transport of fertilizers. In the case of CO2 there are expectations that C can be sequestered through the adoption of conservation agriculture or no-till systems (Barker et al., 2007). A general summary of the potential of different management practices in wheat and maize to mitigate GHG emissions can be found in Table 9.2.
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