! "#$%&!'())!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!,-3$%14! ! on carbon dioxide and methane fluxes from irrigated cropping systems.” J. Environ. Qual. 38: 2023–2033. 2009. 104 West, T.O., and G. Marland. “A synthesis of carbon sequestration, carbon emissions, and net carbon fl ux in agriculture: Comparing tillage practices in the United States.” Agric. Ecosyst. Environ. 91: 217–232. 2002. 105 Ogle, S.M., F.J. Breidt, M.D. Eve, and K. Paustian. “Uncertainty in estimating land use and management impacts on soil organic storage for US agricultural lands between 1982 and 1997.” Global Change Biology, 9: pp. 1521-1542. 2003. 106 Alvarez, R. “A review of nitrogen fertilizer and conservative tillage effects on soil organic storage.” Soil Use and Management, 21: pp. 38-52. 2005. 107 Entry, J.A., R.E. Sojka, and G.E. Shewmaker. “Management of irrigated agriculture to increase organic carbon storage in soils.” Soil Sci. Soc. Am. J. 66: 1957–1964. 2002. 108 Mosier, A.R., A.D. Halvorson, C.A. Reule, and X.J. Liu. “Net global warming potential and greenhouse gas intensity in irrigated cropping systems in northeastern Colorado.” J. Environ. Qual. 35: 1584–1598. 2006. 109 Halvorson, A.D., R.F. Follett, C.A. Reule, and S. Del Grosso. “Soil organic carbon and nitrogen sequestration in irrigated cropping systems of the Central Great Plains.” p. 141– 157. R. Lal and R.F. Follett (ed.) Soil carbon sequestration and the greenhouse effect. Spec. Publ. 57. 2nd ed. SSSA, Madison, WI. 2009. 110 Entry, J.A., R.E. Sojka, and G.E. Shewmaker. “Management of irrigated agriculture to increase organic carbon storage in soils.” Soil Sci. Soc. Am. J. 66: 1957–1964. 2002. 111 Mosier, A.R., A.D. Halvorson, C.A. Reule, and X.J. Liu. “Net global warming potential and greenhouse gas intensity in irrigated cropping systems in northeastern Colorado.” J. Environ. Qual. 35: 1584–1598. 2006. 112 Fox, G., A. Weersink, G. Sarwar, S. Duff , and B. Deen. “Comparative economics of alternative agricultural production systems: A review.” Northeast. J. Agric. Resour. Econ. 20: 124–142. 1991. 113 Manley, J., G. van Kooten, K. Moeltner, and D. Johnson. “Creating carbon off sets in agriculture through no-till cultivation: A meta-analysis of costs and carbon benefits.” Clim. Change, 68: 41–65. 2005. 114 Wiese, A.F., T.H. Marek, and W.L. Harman. “No-tillage increases profits in a limited irrigation– dryland system.” J. Prod. Agric. 11: 247–252. 1998. 115 Archer, D.W., A.D. Halvorson, and C.A. Reule. “Economics of irrigated continuous corn under conventional-till and no-till in northern Colorado.” Agron. J. 100: 1166–1172. 2008. 116 Wiese, A.F., T.H. Marek, and W.L. Harman. “No-tillage increases profits in a limited irrigation– dryland system.” J. Prod. Agric. 11: 247–252. 1998. 117 Archer, D.W. and A.D. Halvorson. “Greenhouse Gas Mitigation Economics for Irrigated Cropping Systems in Northeastern Colorado.” Soil Science Society of America. Vol. 74(2): 446-452. 2010. 118 Ibid. 119 Smith, K.A. and F. Conen. “Impacts of land management on fluxes of trace greenhouse gases.” Soil Use and Management, 20: pp. 255-263. 2004. 120 Helgason, B.L., H.H. Janzen, M.H. Chantigny, C.F. Drury, et al. “Toward improved coefficients for predicting direct N2O emissions from soil in Canadian agroecosystems.” Nutrient Cycling in Agroecosystems, 71: pp. 87-99. 2005: "'#(" !,342#.5#6/1!78$.%3/23$1! 9.21$#23$1!:1;.1
! "#$%&!'())!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!,-3$%14! 121 Li, C., S. Frolking, and K. Butterbach-Bahl. “Carbon sequestration in arable soils is likely to increase nitrous oxide emissions, offsetting reductions in climate radiative forcing.” Climatic Change, 72: pp. 321-338. 2005. 122 Mosier, A.R., A.D. Halvorson, C.A. Reule, and X.J. Liu. “Net global warming potential and greenhouse gas intensity in irrigated cropping systems in northeastern Colorado.” J. Environ. Qual. 35: 1584–1598. 2006. 123 Wiese, A.F., T.H. Marek, and W.L. Harman. “No-tillage increases profits in a limited irrigation– dryland system.” J. Prod. Agric. 11: 247–252. 1998. 124 Archer, D.W. and A.D. Halvorson. “Greenhouse Gas Mitigation Economics for Irrigated Cropping Systems in Northeastern Colorado.” Soil Science Society of America. Vol. 74(2): 446-452. 2010. 125 Marland, G., B.A. McCarl, and U.A. Schneider. “Soil carbon: policy and economics.” Climatic ! Change, 51: pp. 101-117. 2001. 126 Blanco-Canqui, Humberto and R. Lal. “No-Tillage and Soil-Profile Carbon Sequestration: An On-Farm Assessment.” Soil Science Society of America Journal. Vol. 72(3): pp. 693-701. 2008. "'#)" !,342#.5#6/1!78$.%3/23$1! 9.21$#23$1!:1;.1