@ARTICLE {VANLAUWE:2014d, title = {Response to Sommer et al. (2014) Fertiliser use is not required as a fourth principle to define conservation agriculture}, author = {Vanlauwe, B. and Wendt, J. and Giller, K. and Corbeels, M. * and Gerard, B. *}, journal = {Field Crops Research}, year = {2014}, volume = {167}, pages = {159}, issn = {0378-4290}, note = {CAHub}, url = {http://dx.doi.org/10.1016/j.fcr.2014.08.009}, doi = {10.1016/j.fcr.2014.08.009}, }