CETIOM evaluated cultural methods during the intercropping period in the Berry region. Shallow tillage before winter oilseed rape (WOSR) or before winter barley were not effective to stimulate weed germination. Before winter wheat drilling, it gave whole satisfaction. Other results indicated a back-effect of the cultivation before WOSR establishment on the autumnal infestation of Crane's-bills. Deep cultivation (10-15 cms), realized a few weeks preceding the WOSR drilling, amplified the autumnal weed emergence, probably by bringing old seeds from depth to the surface and by breaking their dormancy. In comparison, a very shallow cultivation sharply reduced the subsequent weed infestation in the WOSR. Finally, if the interest of no-till drilling to limit the weed emergence was confirmed, that of the delayed drilling was not attested.
