Nitrous oxide emissions in response to ESN and urea application in a no-till barley cropping system.

Li, C.L., Hao, X., Blackshaw, R.E., Clayton, G.W., O'Donovan, J.T., and Harker, K.N. (2016). "Nitrous oxide emissions in response to ESN and urea application in a no-till barley cropping system.", Communications in Soil Science and Plant Analysis, 47(6), pp. 692-705. doi : 10.1080/00103624.2016.1146745  Access to full text

Abstract

We investigated the effect of environmentally smart nitrogen (ESN) fertilizer on nitrous oxide (N2O) emissions under no-till barley (Hordeum vulgare L.) production over 3 years at three sites in Alberta, Canada. Treatments included two barley cultivars, with ESN and urea applied at 1× and 1.5× the recommended rate, and herbicide at 50% and 100% of registered in-crop rates. Cumulative N2O emissions over the growing season were low (0.11 to 1.32 kg nitrogen (N) per hectare or 0.05–0.22 g N kg−1 grain yield), and not affected by barley cultivars or herbicide rates in all nine site-years, nor by fertilizer type or rate in seven out of nine site-years. However, average N2O emissions from ESN were 15% lower (P = 0.05) than urea across all site-years. Our results suggest ESN could play a role in reducing N2O emissions, but the reduction will depend on rainfall events and crop N utilization.

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