Effect of Herbicides Application on Weed Growth and Subsequent Important on Yield of Three Wheat Varieties.

This field experiment aimed to study the positive effect of some herbicides (Atlantis, Tonic + 2.4 D, Granstar + Tonic, and control, on weed plants to improve the growth and yield of three wheat varieties (Hasad, Wafia, and Rezan) under the rain-fed condition of both locations. The experiment was laid out in a randomized complete block design, arranged according to a split plot with three replicates. At the Grdjan location, herbicide treatment caused a significant reduction in the number of weeds at sampling (100 DAS) compared with the control treatment by 87.98%. While, at the Qaladze location, the reduction values in the number of weeds by herbicides at sampling (120 DAS) was 60.77%. At the Grdjan location, herbicide treatment significantly decreased flag leaf area as compared with the control treatment. However, at the Qaladze location herbicides significantly increased, plant height and a number of grains spike-1, whereas significantly reduced the flag leaf area biological yield and wheat grain yield, compared with the control treatment. At the Grdjan and Qaladze locations, the Rezan variety surpassed the Hasad and Wafia varieties in plant height, spike length, number of grains spike-1, 1000-grain weight, wheat grain yield and biological yield. The interaction among Granstar + Tonic application with the Rezan variety increased plant height and wheat grain yield at the Qaladze location. The interaction among Tonic + 2.4 D treatment with Rezan increased the number of grains spike-1 1000-grain weight and harvest index. [ABSTRACT FROM AUTHOR]