Effect of Tillage Systems and Herbicide Application in ‎Weed Control of Canola (Brassica napus L.)‎

Integrated weed management in canola (Hyola 401) was studied in an experiment conducted in 2014-2015 growing season in “Kohghilooyeh and Boyer Ahmad”, Iran. The experiment was performed in strip split plots based on randomized complete block design with three replications. Tillage systems with three levels (conventional tillage, reduced tillage and no-tillage) assigned to main plots, and herbicide applications at four levels consisted of trifluralin (1200 g ai ha-1,48% EC), quinmerac (1040 g ai ha-1, 41.6% SC), clopyralid (180 g ai ha-1, 30% SL) setoxydim (375 g ai ha-1, 12.5% EC), clopyralid (180 g ai ha-1) haloxyfop-R methyl ester (81 g ai ha-1, 10.8 % EC) and weed free treatments. Results showed that weed density and dry weight reductions were 76.84% and 68.08% in reduced tillage system quinmearc application, respectively. It was, also, observed that treatment influenced plant height, biological yield, harvest Index, silique number per plant, seed number per silique, 1000-seed weight and seed yield. The maximum yield (3226 kg.ha-1) was obtained by using reduced tillage quinmearc application. Therefore, it would be concluded that reduced tillage quinmearc was the best treatment to control weed and achieve high canola seed yield. The results, also, revealed that use of clopyralid Haloxyfop-R-methyl ester no-tillage resulted in lowest yield (467 kg.ha-1) So, it was considered as inefficient treatment.