1. AEAT (1998) Options to reduce nitrous oxide emissions (Final report). AEAT-4180. directorate-general of the environment, nuclear safety, and protection (European Union), Brussels, Belgium
2. Allen RG, Pereira LS, Raes D, Smith M (1998) Crop evapotranspiration - guidelines for computing crop water requirements. FAO, Rome, Italy
3. Allison FE (1973) Soil organic matter and its role in crop production. Elsevier, Amsterdam, The Netherlands
4. Ammann C, Spirig C, Leifeld J, Neftel A (2009) Assessment of the nitrogen and carbon budget of two managed temperate grassland fields. Agr Ecosyst Environ 133:150–162. https://doi.org/10.1016/j.agee.2009.05.006
5. AOAC (1990) Official Methods of Analysis (15th Edn). Washington, DC, USA: Association of Official Analytical Chemists