Evaluation of Pure and Mix Formulations in Grass Leaved Herbicides on Weeds Control, Yield and Yield Components of Wheat (Triticum aestivum L.)

Subject Areas : Journal of Crop Ecophysiology

Farhad Saki ¹ , Abdol Reza Ahmadi ² , Ali Asghar Chitband ³

1 - MS.c. Graduated Student in Weed Science, Faculty of Agriculture, Lorestan University, Lorestan, Iran
2 - Associate Professor of Weed Science, Department of Plant Protection, Faculty of Agriculture, Lorestan University, Lorestan, Iran
3 - Assistant Professor of Weed Science, Department of Plant Protection, Faculty of Agriculture, Lorestan University, Lorestan, Iran

Received: 2022-01-31 Accepted : 2022-05-21 Published : 2022-06-18

Keywords: Grass leaf, Mixture dose, Pinoxaden + Clodinafop-propargyl, Visual observation, Weed resistance,

Abstract :

To evaluate the efficacy of several herbicides for weed control in wheat fields, an experiment carried out as complete randomized block design with three replications at Lorestan province during 2020-2021. The experiment treatment was the pure clodinafop-propargyl (Topik®) application at 32, 48, 64 and 80 g active ingredients (a.i.) ha-1, pinoxaden pure application of pinoxaden (Axial®) ans also ready mix of pinoxaden + clodinafop-propargyl (binary mixture) (Traxos®) application at 33.75, 50.62, 67.5 and 84.37 g a.i. ha-1. The results showed that herbicide different doses were significant on all weeds density and dry weight. All crop characteristics such as biological yield, spike length, grain yield except crop height were significant by herbicide different doses as well. But seed 1000 weight was not significant by herbicide herbicide different doses. Also based on results, some weeds such as wild oat, ryegrass, blackgrass and canarygrass were sensitive to clodinafop-propargyl and pinoxaden pure application as their reduced dry weight compared to control were 24.01, 29.31, 27.71 and 51.92 for clodinafop-propargyl and 30.84, 22.32, 20.90 and 51.29 for pinoxaden, respectively. Binary mixture of pinoxaden + clodinafop-propargyl had more efficacy than their pure application. According to visual observations results, the only 50 percent control of wild barley, rye and downy brome were achieved when the mixture of pinoxaden + clodinafop-propargyl were used at high dose. The highest of grain yield was also attained at doses of 67.5 and 84.37 g a.i. ha-1 of pinoxaden + clodinafop-propargyl which increased grain yield 18.32 increase compared to the pure application of each herbicide. Therefore, due to the frequent application of clodinafop-propargyl and pinoxaden and the possibility occurring of weed resistance to these herbicides, using mixture of pinoxaden + clodinafop-propargyl can be suitable not only to more effective in weeds control but also as a appropriate replacement in herbicide rotation for managing and delaying of possible resistance in weeds.

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