Abstract
The objectives of this 2-year field study were to assess the effects of irrigation and nitrogen (N) application on nitrous oxide (N2O). Soil N2O flux was determined using open-bottomed chambers. Nitrous oxide concentrations were determined with gas chromatography. The results showed that in 2008, N2O emission rates ranged from 2.0 to 50.0 g N ha−1 d−1 in the alternating furrow irrigation and N application treatments (AFINA) and from 2.4 to 68.4 g N ha−1 d−1 in the conventional every-furrow irrigation and fertilization treatment (CIF). In 2009, cumulative N2O-N loss in the optimal combination with greater yields and lower N2O emission in AFINA was 1277 g N ha−1 compared to 1695 g N ha−1 with CIF. The study indicated that AFINA practices combined with optimum N fertilizer and irrigation rates could reduce soil N2O emission and water input compared to CIF practices without causing a decline in corn yield.
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