Acetylene and N-serve effects upon N2O emissions from NH4+ and NO3? treated soils under aerobic and anaerobic conditions |
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| Authors: | MS Aulakh DA Rennie EA Paul |
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| Institution: | Department of Soil Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0 |
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| Abstract: | N2O emissions from soils treated with NH4+-N under aerobic conditions in the laboratory were 3- to 4-fold higher than those from controls (no extra N added) or when NO3?-N was added. Although the emission of N2O-N in these field and laboratory experiments represented only 0.1–0.8% of the applied fertilizer NH4+-N and are therefore not significant from an agronomic standpoint, these studies have conclusively demonstrated that the oxidation of applied ammoniacal fertilizers (nitrification) could contribute significantly to the stratospheric N2O pool.Like N-serve, acetylene was shown to be a potent inhibitor of nitrification as it stopped the oxidation of NH4+-N to (NO3+-N + NO2?)-N and hence reduced the evolution of N2O from nitrification within 60 min after its addition.Although high amounts of NO3?-N were present, the rate of denitrification was very low from soils with moisture up to 60% saturation. The further increase in the degree of saturation resulted in several-fold increase of denitrification which eventually became the predominant mechanism of gaseous N losses under anaerobic conditions. |
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