Evaluation of herbicide efficacy of Bazageran M60 (Bentazone + MCPA, SL 46%) in paddy weed control

Repeated use of an herbicide or herbicides with the same mechanism of action results in a change in flora and weed resistance. Therefore, in order to evaluate the effectiveness of the new herbicide of Bazageran M60 in comparison with conventional herbicides, an experiment was conducted in the research farms of the Rice Research Institute in Gilan and Mazandaran in 2018. treatments included doses of 575, 1150, 1725, and 2300 (g.ai.ha-1) herbicide of Bazageran M60, the recommended dose of common nominal herbicides, Nominee (SC10%), Cleanweed (SC 40%) and Saturn (EC 50%) with two control (weed infested and hand weeded). The efficacy of Bazagran in control of bulrush was observed three days after treatment and it peaked within 10 days, while the first symptoms of the effect of nominee and Cleanweed appeared about three weeks after treatment. The efficiency of the recommended dose of Bazagran to control bulrush (Schoenoplectus maritimus) in the field ranged from 60 to 85 percent but it was more than 90 percent for Nominee and Cleanweed. The highest paddy yield in Gilan was obtained at a dose of 2300 (g.ai.ha-1) of Bazageran and in Mazandaran due to having a quarter of weeds of Gilan farms belonged to 575 (g.ai.ha-1) which were 30 and 40 percent more than weeding, respectively. Due to the high density of weeds in Gilan, a high dose of Bazagaran (2300 g.ai.ha-1) is recommended and the insufficient efficiency of this herbicide in controlling weeds, its combination formula with Saturn had a better performance in controlling most weeds.