avec des herbicides sélectifs (T6) reste envisageable dans la gestion des mauvaises herbes sur les grandes superficies pour une réduction des coûts d'exploitation. Mots clés: adventices, oignon, herbicides, sarclage, centre, Burkina Faso Impact of weed control on the productivity and quality of onion bulbs in the center of Burkina Faso ABSTRACT Objective: This study aims to assess in central Burkina Faso the effect of the method of weeding on the productivity of the onion and the quality of the harvested bulbs in order to propose a method allowing a better control of the weed cover of this crop in the zone. Methodology and results: The experimental design is a randomized complet block with 4 replications and 6 treatments with the following formulations T1, T2, T3, T4, T5 and T6.The results showed that manual weeding on the 30th and 60th day after transplanting (T3) and Pendimethalin (herbicide) applied in preemergence only (T4) or followed by Manual Weeding on the 60th day after transplanting (T6) resulted in the largest numbers of respective bulbs of 116.75; 117.5 and 120.25 bulbs / 6 m². The average bulb weight transplanting with 41.55 and 26.3 g respectively. With respect to all treatments, total and permanent weeding and also manual weeding carried out on the 30th and 60th day after transplanting, have observed slightly better bulbs yields of 4.13 kg and 3.17kg/6 m² respectively. The absence of weeding (Control) and Clethodim (herbicide) in post-emergence (T5) resulted in a lower yield at harvest. Regardless of the applied treatments, the dry matter of the bulb has shown a very low variability ranging from 11.72% (T6) to 12.8% (T1). Conclusion and application of results Continuous and permanent weeding have observed a minimum number of 10.5 bulbs / 6 m² of small caliber and Clethodim in post-emergence a maximum of 26.5 bulbs / 6 m² of small caliber. The same trend was observed for the weight of small-caliber bulbs, with the continuous and permanent weeding which kept the lowest value of 0.04 kg / 6 m². On the other hand, the Manual Weeding on the 30th and 60th day after transplanting (0.08 kg / 6 m²), the Pendimethalin in pre-emergence and the Clethodim in post-emergence have observed the highest value of 0.09 kg / 6 m² of bulbs demonstrating a lower performance of these two molecules applied. Weeding and frequent hoeing in vegetable crops require an important workforce and is demanding in time. Their association with selective herbicides (T6) remains possible in the weed control on large areas for a reduction of operating costs.