Investigating the effectiveness of oxyfluorfen, cetoxydim, bentazone and penoxolam herbicides along with the use of additives in the control of purple nutsedge (Cyperus rotundus L.) in onion (Allium cepa)

Purple nutsedge is one of the harmful weeds in onion (Allium cepa L.) fields. This project aims to investigate the effectiveness of oxyfluorfen, cetoxydim, bentazone and penoxolam herbicides along with the use of adjuvant. The use of additives is one of the most important effective ways to increase the efficiency and reduce the amount of herbicides. It was carried out in the form of a randomized complete block design with 11 treatments and three replications in industrial and cultivation fields in the year of 2021. The results of the project showed that the effect of different herbicides on the traits of Cyperus rotundus was significant and significantly reduced the number of shoots, number of tubers, above and below fresh and dry weight of shoots of Cyperus rotundus. The best treatment using bentazone + oil and cetoxydim + bentazone was obtained, yeild onion highest was obtained by hand weeding (47.272 ton. ha) and Bentazone + oil: Sethoxydim: Bentazone (43.636 ton. ha). Which was not significantly different from the control treatment (weed free). Therefore, the combination of the post-emergence application of bentazon + oil and cetoxydim + bentazone can be effective for controlling the purple nutsedge.