Abalos Diego, Jeffery Simon, Sanz-Cobena Alberto, Guardia Guillermo, Vallejo Antonio (2014): Meta-analysis of the effect of urease and nitrification inhibitors on crop productivity and nitrogen use efficiency. Agriculture, Ecosystems & Environment, 189, 136-144  https://doi.org/10.1016/j.agee.2014.03.036 Agronet – Colombian Ministry of Agriculture and Rural Development (2013): Statistics for the agricultural sector. Available at: http://www.agronet.gov.co/estadistica/Paginas/default.aspx (accessed 7 September 2016)Aronson E. L., Helliker B. R. (2010): Methane flux in non-wetland soils in response to nitrogen addition: a meta-analysis. Ecology, 91, 3242-3251  https://doi.org/10.1890/09-2185.1Ball B. C. (2013): Soil structure and greenhouse gas emissions: a synthesis of 20 years of experimentation. European Journal of Soil Science, 64, 357-373  https://doi.org/10.1111/ejss.12013 Cruz C., Bio A.F.M., Domínguez-Valdivia M.D., Aparicio-Tejo P.M., Lamsfus C., Martins-Louçao M.A. (2006): How does glutamine synthetase activity determine plant tolerance to ammonium? Planta, 223: 1068–1080.Harrison-Kirk T., Beare M.H., Meenken E.D., Condron L.M. (2013): Soil organic matter and texture affect responses to dry/wet cycles: Effects on carbon dioxide and nitrous oxide emissions. Soil Biology and Biochemistry, 57, 43-55  https://doi.org/10.1016/j.soilbio.2012.10.008Huérfano Ximena, Fuertes-Mendizábal Teresa, Duñabeitia Miren K., González-Murua Carmen, Estavillo José María, Menéndez Sergio (2015): Splitting the application of 3,4-dimethylpyrazole phosphate (DMPP): Influence on greenhouse gases emissions and wheat yield and quality under humid Mediterranean conditions. European Journal of Agronomy, 64, 47-57  https://doi.org/10.1016/j.eja.2014.11.008 IPCC (International Panel on Climate Change) (2006): Guidelines for national greenhouse gas inventories. In: Eggleston H.S., Buendia L., Miwa K., Ngara T., Tanabe K. (eds.): Prepared by the National Greenhouse Gas Inventories Programme. Japan, IGES.IRIGOYEN IGNACIO, LAMSFUS CARMEN, APARICIO-TEJO PEDRO, MURO JULIO (2006): The influence of 3,4-dimethylpyrazole phosphate and dicyandiamide on reducing nitrate accumulation in spinach under Mediterranean conditions. The Journal of Agricultural Science, 144, 555-  https://doi.org/10.1017/S0021859606006472Jia Junxiang, Sun Liying, Kong Xianwang, Yan Xiaoyuan, Xiong Zhengqin (2012): Annual N ₂ O and CH ₄ emissions from intensively managed vegetable fields in Nanjing, China. Soil Science and Plant Nutrition, 58, 91-103  https://doi.org/10.1080/00380768.2011.644510 Krey V., Masera O., Blanford G., Bruckner T., Cooke R., Fisher-Vanden K., Haberl H., Hertwich E., Kriegler E., Mueller D., Paltsev S., Price L., Schlömer S., Ürge-Vorsatz D., van Vuuren D., Zwickel T. (2014): Annex II: Metrics and methodology. In: Edenhofer O., Pichs-Madruga R., Sokona Y., Farahani E., Kadner S., Seyboth K., Adler A., Baum I., Brunner S., Eickemeier P., Kriemann B., Savolainen J., Schlömer S., von Stechow C., Zwickel T., Minx J.C. (eds): Climate Change 2014: Mitigation of Climate Change. Cambridge, Contribution of Working Group III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press, 1281–1328.Le Mer Jean, Roger Pierre (2001): Production, oxidation, emission and consumption of methane by soils: A review. European Journal of Soil Biology, 37, 25-50  https://doi.org/10.1016/S1164-5563(01)01067-6Losák Tomáš, Hlušek Jaroslav, Kráěmar Stanislav, Varga Ladislav (2008): The effect of nitrogen and sulphur fertilization on yield and quality of kohlrabi (Brassica oleracea, L.). Revista Brasileira de Ciência do Solo, 32, 697-703  https://doi.org/10.1590/S0100-06832008000200024Menéndez S., Merino P., Pinto M., González-Murua C., Estavillo J. M. (2006): 3,4-Dimethylpyrazol Phosphate Effect on Nitrous Oxide, Nitric Oxide, Ammonia, and Carbon Dioxide Emissions from Grasslands. Journal of Environment Quality, 35, 973-  https://doi.org/10.2134/jeq2005.0320Pasda Gregor, Hähndel Reinhardt, Zerulla Wolfram (2001): Effect of fertilizers with the new nitrification inhibitor DMPP (3,4-dimethylpyrazole phosphate) on yield and quality of agricultural and horticultural crops. Biology and Fertility of Soils, 34, 85-97  https://doi.org/10.1007/s003740100381Pfab Helena, Palmer Iris, Buegger Franz, Fiedler Sabine, Müller Torsten, Ruser Reiner (2012): Influence of a nitrification inhibitor and of placed N-fertilization on N2O fluxes from a vegetable cropped loamy soil. Agriculture, Ecosystems & Environment, 150, 91-101  https://doi.org/10.1016/j.agee.2012.01.001Ruser Reiner, Schulz Rudolf (2015): The effect of nitrification inhibitors on the nitrous oxide (N ₂ O) release from agricultural soils-a review. Journal of Plant Nutrition and Soil Science, 178, 171-188  https://doi.org/10.1002/jpln.201400251Anjana Shahid Umar, Iqbal Muhammad (2007): Nitrate accumulation in plants, factors affecting the process, and human health implications. A review. Agronomy for Sustainable Development, 27, 45-57  https://doi.org/10.1051/agro:2006021Van Groenigen J. W., Velthof G. L., Oenema O., Van Groenigen K. J., Van Kessel C. (2010): Towards an agronomic assessment of N2O emissions: a case study for arable crops. European Journal of Soil Science, 61, 903-913  https://doi.org/10.1111/j.1365-2389.2009.01217.xWeitzberg Eddie, Lundberg Jon O. (2013): Novel Aspects of Dietary Nitrate and Human Health. Annual Review of Nutrition, 33, 129-159  https://doi.org/10.1146/annurev-nutr-071812-161159