Published in Scientific Papers. Series A. Agronomy, Vol. LVIII
Written by Grozi DELCHEV, Mitko GEORGIEV
Chemical control has emerged as the most efficient method of weed control. Herbicides combinations and tank mixturesof herbicides with adjuvants, fertilizers, growth regulators, fungicides, insecticides, are more effective than when theyare applied alone in sunflower crops. Their combined use often leads to high synergistic effect on yield. Introduction ofnew sunflower Clearfield and Express Sun technologies marks a new stage in the weed control in this crop, includingagainst Orobanche cumana Wall. Problem is a post-effect of some herbicides used in the predecessors on succeedingcrops, which is directly related to the weather conditions during their degradation. Most of the information insunflower relates to conventional technology for the weed control. On some issues are published contrary opinions, dueprimarily to the different conditions under which the experiments were conducted and also the biologicalcharacteristics of the investigated cultivars and hybrids. It is insufficient studied the effect of the herbicides on thesunflower yield that occurs by treatment the crop with the tank mixtures of herbicides, stimulators and fertilizers. Aserious problem is also the volunteers of the Clearfield and Experess Sun sunflower. They have resistance to herbicidesdifferent from that one of conventional sunflower hybrids. There is no information still in the scientific literature tocontrol of these volunteers.
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