Dobrudzha Agricultural Institute - General Toshevo, 9521, General Toshevo, Bulgaria
Резюме
The investigations were carried out during 2016–2017 at Dobrudzha Agricultural
Institute – General Toshevo (DAI). The aim of this investigation was to determine
the effect of the treatment with herbicides in sunflower on weed infestation. The
following herbicides combinations were used: pendimetalin (450 ml)+linuron (300
ml); linuron (300 ml) + pendimetalin (450 ml); metolachlor+terbutilazin (350
ml)+kletodim (160 ml); petoxamid (300 ml) + linuron (300 ml). The herbicides
were applied at stage 01 (BBCH), and pendimetalin (450 ml) and kletodim (160
ml) at stage 12-14 (BBCH) on three sunflower hybrids ”Viyani”, ”Kaliya” and
”Velko”. The herbicide effect was determined by the quantitative weight method
and evaluated by the EWRS scale. Regardless of the used hybrid, the herbicide
combination petoxamide+linuron had highest efficiency (100%) on all investigated
weeds: Setaria viridis L., Echinochloa crus-galli L.,Sinapis arvensis L., Datura stramonium L., Xanthium strumarium L., Amaranths retroflexus L., Polygonum convolvulus L., Chenopodium album L., Polygonum hydropiper, Convolvulus
arvensis L., Cirsium arvense (L.) Scop and Canabis sativa L. Herbicide combinations:
pendimetalin+linuron; linuron+pendimetalin; metolachlor+terbutilazin+kletodim
had lower effect (90-94%) on Setaria viridis L. and Echinochloa crus-galli L. but
to broadleaved weeds (100%).
Did not observed visible symptoms of phytotoxity at investigated hybrids.
