Document Type : Research Article
Authors
1
Department of plant production and genetics, faculty of agriculture and natural resources, university of mohaghegh ardabili,Ardabil,Iran.
2
Department of Agronomy, Faculty of Agriculture, Tarbiat Modares University, PO Box 14115-336, Tehran, Iran
3
Department of Agriculture Engineering, Faculty of Agriculture, Technical and Vocational University (TVU), Tehran, Iran
10.22034/ijws.2025.135814
Abstract
To investigate the effect of anionic and nonionic surfactants at different pH levels on the efficacy of sulfosulfuron in controlling wild barley, an experiment was conducted in a CRD as a factorial arrangement with four replications. The first factor was the application of sulfosulfuron herbicide (WG 75%) at four doses of 0, 13.3, 26.6, and 35 g ha-1. The second factor included the application of 10 types of surfactants that were sprayed on wild barley in mixtures with sulfosulfuron in solutions with pHs of 5, 7, and 9. There was no wild barley spike when sulfosulfuron was applied at 26.6 g ha-1 combined with SLS at pH 5 and 7 and KECO10 at pH 7 and 9, while in the control treatment without surfactant, spike dry weights exceeded 300 g m-2 at all pH levels. The minimum dry weights of wild barley were recorded at the mentioned sulfosulfuron dose combined with SLS at pH 5 and 7 and KECO10 at pH 7 and 9, which were 299, 438, 334, and 356 g m-2 respectively. In contrast, in the control without surfactants, the dry weight of wild barley exceeded 1000 g m-2 across all pH levels. Furthermore, the lowest effective doses for 90% control (ED90) were 13.9, 19.2, 15, and 12.7 g ha-1 for the respective treatments, compared to 35 g ha-1 in the control. The application of surfactants at different acidity levels, alone or together with sulfosulfuron, had no significant effect on total dry weight or leaf area in wheat cultivars Sivand, Bahar, and Sirvan. Although the use of all surfactants increased the efficacy of sulfosulfuron in controlling wild barley, the pH of the final solution can play a significant role in the performance of both the surfactant and the herbicide.
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