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Vanlauwe, Bernard ,  Wendt, J. ,  Giller, Ken E. ,  Corbeels, Marc ,  Gerard, Bruno G. ,  [Response to Sommer et al. (2014) Fertiliser use is not required as a fourth principle to define conservation agriculture] ,  Response to Sommer et al. (2014) Fertiliser use is not required as a fourth principle to define conservation agriculture