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Fluid Journal : Late Spring 2013
16 The Fluid Journal Late Spring 2013 Figure 4. Daily N2O -N fluxes with standard error bars at each sampling date in 2009 with for (A) SuperU, urea, ESN, ESN subsurface band (ESNssb), and check; and (B) urea-ammonium nitrate (UAN), UAN+AgrotainPlus (AP), UAN+Nfusion (Nf) and blank. Note the different scales on Y axis. Averaged over N sources, growing season N2O emissions were lower in 2009 than in 2010. The higher WFPS in 2010 during May through mid-June than in 2009 (Figure 3) may have contributed to the yearly difference, with some denitrification possibly contributing to the increased N2O loss. Compared with granular urea (averaged over years), UAN+AgrotainPlus reduced N2O-N emissions 70%, UAN+Nfusion 57%, SuperU 53%, ESN 49%, UAN 42%, and ESNssb 33% in this ST production system. Compared with liquid UAN, UAN+AgrotainPlus reduced N2O-N emissions 49%, UAN+Nfusion 26%, SuperU 19%, and ESN 12%, results that are in agreement with our previous studies. The N2O -N emission losses as a percentage of fertilizer N applied are reported in Table 4, with no significant interaction between N source and year. The N2O -N loss was significantly higher in 2010 than in 2009, with N sources having significant differences in N2O -N loss. All other N sources had significantly lower N2O -N emission losses than granular urea. This result indicates that the potential for reduction of N2O-N emissions with the use of controlled- release, slow-release, and stabilized N fertilizer sources in ST systems is substantial. The calculations above show that the fertilizer-induced component of N2O -N emissions could be reduced up to 70% by using enhanced-efficiency N sources in semiarid, irrigated cropping systems. The degree of reduction may vary strongly, depending on cropping MAXIMIZE PROFITS Root Growth Stimulator is a synergistic formulation of zinc and ammonium acetate that stimulates the plant to generate a greater volume of healthier roots. The result is a plant with more vigor and greater stress tolerance that produces higher yields and higher profits. learn more at: www.nulex.com Visit your Nulex Distributor or contact a sales representative at 800-831-4815
Early Spring 2013