Open Access
Cah. Agric.
Volume 25, Number 2, Mars-Avril 2016
Article Number 25005
Number of page(s) 6
Section Études originales / Original Studies
Published online 04 April 2016

© R. Trédan and J.-P. Colin, Published by EDP Sciences 2016

Licence Creative Commons
This is an Open Access article distributed under the terms of the Creative Commons Attribution License CC-BY-NC (, which permits unrestricted use, distribution, and reproduction in any medium, except for commercial purposes, provided the original work is properly cited.