Emissions of N₂0 from soils is the result of complex interactions among agronomic practices, N fertilization regime (i.e. source, rate, timing, and place of N fertilizer application), soil physical and chemical properties, and weather conditions. The results of a given field study are therefore determined by site-specific conditions during the experiment, and their extrapolation in time and space is difficult. Meta-analysis is a statistical tool that has been widely used to analyze and integrate larger sets of research findings (Valkama et al., 2009; de Graaff et al. 2006; Van Groenigen et al. 2006; Hungate et al. 2010; Chivenge et al. 2011).

Current contact info:
Dr. Johan Six, Professor in Sustainable Agroecosystems
Department of Environmental System Science
ETH-Zurich (Swiss Federal Institute of Technology Zurich)
TAN F4, Tannenstrasse 1
8092 Zurich, Switzerland
Email:Jsix@ethz.ch
Phone: +41 44 63 2 84 83

Dr. Charlotte Decock, Postdoctoral Scholar
Department of Environmental System Science
ETH-Zurich
TAN F4, Tannenstrasse 1
8092 Zurich, Switzerland
Email: charlotte.decock@usys.ethz.ch