- Authors: Jeffery, S., Verheijen, F.G.A., van der Velde, M., Bastos, A.C.
- Title: A meta-analysis of the effects of biochar application to soils on crop productivity
- Conference Title: European Confederation of Soil Science Societies, EUROSOIL 2012, 4th International Congress
- Conference Location: Bari, Italy
- Conference Date: 2-6 July 2012
- Year Published: 2012
- link: http://www.scienzadelsuolo.org/_docs/Atti_Eurosoil_2012.pdf