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2. Estimates of N2O and CH4 fluxes from agricultural lands in various regions in Europe;Boeckx;Nutrient Cycling in Agroecosystems,2001
3. CSO, 2006. Central Statistics Office, Skehard Road, Cork, Ireland. www.cso.ie.
4. A survey of fertilizer use from 2001–2003 for grassland and arable crops;Coulter,2004
5. CMMS Statistics Report 2004;DAF (Department of Agriculture and Food),2005