engleski

Site specific post-emergence weed control in soybean

Field experiments were conducted over two years at three different locations (Šašinovecki Lug (1 and 2) and Oborovo) to evaluate the influence of post-emergence herbicides (imazamox at 40 g a.i. ha-1 ; imazamox in split treatment at 20 + 20 g a.i. ha-1 ; imazamox+bentazone at 40+900 g a.i. ha-1 and imazamox +tifensulfuron at 40+6 g a.i. ha-1) on weed control and soybean [Glycine max (L.) Merr.] response. Experiments were set under natural weed flora with significantly higher weed infestation at the Oborovo location (190 weeds m-1) when compared to Šašinovečki Lug (SL) 1 (26 weeds m-1) and SL 2 (52 weeds m-1). All treatments reduced weed biomass and increased soybean yield plant-1 when compared to the untreated control. Satisfactory broadleaved biomass reduction (88.5-99.0%) was achieved by all herbicide treatments except at the Oborovo location where imazamox 40 g a.i. ha-1 achieved 64.1% reduction due to poor biomass reduction for Chenopodium album which was reflected in lower soybean yield. Addition of bentazone or tifensulfurone to imazamox or split applicaton of imazamox improved weed control by an average of 35 % and soybean yield by 38.7 %. On other locations there was no statistical difference among herbicide treatment in broadleaved biomass reduction and soybean yield.

imazamox;; soybean; weed; herbicides

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