Abstract
Oilseed rape seed loss during harvest can cause subsequent unwanted gene flow and thus give raise to management difficulties in order to keep segmented different productions. Furthermore, seed loss reduces benefits of producers. This loss was evaluated in different conditions and trials carried out in three French regions from 2002 to 2004. Seed loss was divided into three categories : before harvest, under the cutter bar and behind the combine harvester. Total loss represented on average 8,2 % of the harvest for grain water content under 12 %. But this figure does not take an important variability into account. Indeed, an advanced cutter bar could reduce loss by 80 % and grain humidity at harvest plays an important part in the total loss level and its distribution. Before harvest low grain water content could make seed loss more sensitive to climatic events. Under the cutter bar, seed loss is inversely proportional to grain water content. On the contrary, it increases with grain water content behind the combine, due to loss in green siliquae. These studies can help improving advice to producers and contribute to improve gene flow models.
Highlights
Article reçu le 20 septembre 2005 Accepté le 13 décembre 2006 FONDAMENTALLe colza est une plante déhiscente dont les graines peuvent tomber au sol avant ou pendant la récolte
Seed loss reduces benefits of producers. This loss was evaluated in different conditions and trials carried out in three French regions from 2002 to 2004
An advanced cutter bar could reduce loss by 80 % and grain humidity at harvest plays an important part in the total loss level and its distribution
Summary
Le colza est une plante déhiscente dont les graines peuvent tomber au sol avant ou pendant la récolte. Ces graines peuvent produire des repousses dont les graines et le pollen viendront altérer la qualité du colza suivant, dans le cas où l’agriculteur alterne deux types de colza (par exemple OGM puis conventionnel) sur la même parcelle. Les pertes des graines peuvent survenir à trois niveaux : avant la récolte par égrenage naturel, pendant la récolte sous la barre de coupe et à l’arrière de la moissonneuse après battage. Deux méthodes d’évaluation directe ont été mises au point : Price et al [3] repris par Hobson et Bruce [9] récupèrent les graines dans des bacs avant la récolte et sous la barre de coupe, mais ne comptabilisent pas les pertes à l’arrière de la machine.
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