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Fluid Journal : Late Spring 2013
12 The Fluid Journal Late Spring 2013 season N2O-N fluxes from the ESN are consistent with earlier results. The rapid increase in N2O emissions following N application is consistent with earlier work by others where it was reported that 50% of the N2O emissions occurred shortly after N application, regardless of tillage or crop rotation practices. In 2009, we were able to collect N2O flux measurements during the non- crop period (1 Oct. 2009 to 22 Mar. 2010). Nitrous oxide fluxes remained near background levels for the entire period for all N treatments, with a slight rise in N2O emissions on 4 Mar. 2010, as the frozen soil had thawed and soil temperatures increased, with a decline Figure 1. Air (A) and soil temperature (B) at about the 5-7 cm depth measured at the time of gas flux measurement in 2009 and 2010. to background levels at the 12 Mar. sampling date. The slight increase in N2O emissions as the soil thawed out is consistent with the observations of others who have reported increased N2O fluxes at spring thaw. Average N2O-N emissions (174 d) for the non-crop period were: 1.44a, 1.23ab, 1.18ab, 1.13bc, 0.99bed, 0.88cd, 0.87cd, 0.80d, and 0.79d g N ha-1d-1 for ESNssb, ESN, SuperU, urea, UAN+AgrotainPlus, UAN+Nfusion, check, UAN, and blank, respectively, with significant differences indicated by lowercase letters following the daily emission value. The ESNssb treatment had the highest daily non-crop period emissions and the blank (no N applied) had the lowest emissions. The ESNssb Fluid Journal Internet Edition Now Reaches Readers in 28 Countries and Territories. Log onto www.fluidjournal.org for Info Today!
Early Spring 2013