0000000000993462
AUTHOR
Rodriguez Alain
Membres du comité d’organisation scientifique et logistique
National audience
Organisation scientifique du colloque
National audience
La nuisibilité directe des adventices en grandes cultures : quelles réponses nous apportent les essais désherbages ?
The direct harmful effect of weeds in field crops : what do herbicide trials tell us ? Weeds are plants whose undesirable qualities (“harmfulness") outweigh their desirable qualities (trophic resources). Few studies conclude that weeds do not affect crop yield. However, it is difficult to generalize since weeds compete with crops for resources and these resources are spatially and temporally variable. This study analyzed 110 herbicide trials (untreated vs. treated plots) performed in France from 1993 to 2015 on three major grain crops: winter wheat, winter oilseed rape and sunflower. Significant yield losses were found in 92% of wheat trials (average over all trials: -2.6 t/ha), 51% of wint…