بررسی کارآیی علفکش جدید کلتودیمEC24% (سلکت ام) درکنترل علفهای هرز باریک برگ سویا

An experiment was conducted to evaluate the efficiency of Clethodiim herbicide Select MEC24%) for controlling grass weeds in soybean fields in a randomized complete block design with 8 treatments and 4 replications during the 2020 in Khozestan , Golestan and West Azarbaijan provinces. The experimental treatments included (1, 2 and 3) post emergence applicationofClethodim(Selct Mherbicide) (EC24%) at 0.4, 0.6 and 0.8 liliters per hectare, (4) post emergence application of Select super herbicide (EC12%) at 1 liliter per hectare, (5) post emergence applicationofHaloxyfop R methyl (Gallant super) at herbicide (EC10.8%) at a rate of 1 liters per hectare (6) post emergence application Clethodim (Woprodim)at rate of 1.2liliter per hectare, (7) post emergence application of Sethoxydim12.5% OEC(Nabo S)at 3liliters per hectare and (8) hand weeding. In Dezfolexperiment, crope yield of all herbicide treatments with the exception of hand weedin with 2.07 T/h,were placed in same group .In Golestan. Results showed that selectM 0.8 l/ha and select super had the most pods in plant .Also analysis of results showed that effect of treatment had significant effect at 1% on yield .The highest yield belonged to select super 1liliter with 1674.24 and the lowest yield in Golestan belonged to Select M 0.4 and 0.6 liliter. In Urmia the highest yield after control treatment was showen in Select M 0.8 liliter with 1660.85 Kg/ha and Super Galant 1685/05 Kg/ha .In Dezfol, Select M 0.6 and 0.8 l/ha ,select super, Woprodim ,Nabo S and control without weed treatments were placed in a same statistical group in the point of control of Echinocloacolonum. In Golestan the lowest dry weight of Echinocloacolonumwas observed at Select M0.8 and 0.6 l/ha,select super ,Gallant super and Woprodim which were placed in a 5 % statistical group.In Urmia in terms of weed density reduction ,after control (hand weeding), select M 0.8 liliter and super gallant 1l/ha were placed in a same statistical grope.There was significant difference between herbicide treatments in Khoseztan ,Golestan and West azarbaijan in terms of weed biomass reduction percentage. Based on the results of this study, the post emergence application of Cheletodim (EC24%) at a rate of 0.6 /ha,can be recommended in Soybean farms to grass weed control. The recommended dose of this herbicide is 0.6 liters per hectare, showing a slight decrease in efficiency compared to the dose of 0.8 in the same group, with this dose it is placed at a statistical level of 5%, and since it can be equivalent to these herbicides or equivalent to weeding treatment, it causes a significant reduction in the density and dry weight of narrow leaf weeds and an increase in soybean yield can be used to control narrow leaf weeds in soybean fields.