Plant Archives Vol. 19 No. 2, 2019 pp. 4463-4469 e-ISSN:2581-6063 (online), ISSN:0972-5210 ACTIVITY OF HERBICIDE IODOSULFURON -MESOSULFURON AFFECTED BY MAGNETIC TREATMENT TO WEED CONTROL IN FIVE WHEAT CULTIVARS Hameed A.K. Alfarttoosi 1 , Nabil R. Lahmod 2 and Ali K. Slomy 3 1 Field Crop Department, Agriculture College, Kerbala University, Iraq. 2 Field Crop Department, Agriculture College, Wasit University, Iraq. 3 Horticulture Department, Agriculture College, Green Qasim University, Iraq. Abstract Field experiment was conducted in the fields of Agriculture Collage, Kerbala University, Iraq, during winter season of 2016- 2017 to evaluate the activity of herbicide iodosulfuron-mesosulfuron affected by magnetic treatment on weed control in five wheat cultivars. Randomized completely block design was used in split plot arrangement in three replications. The main plots were five wheat cultivars (Sham6, Bhoth 22, Ipa99, alfateh and Tahady) while herbicide treatments represent (100% and 50% of the recommendation of iodosulfuron -mesosulfuron) were made with or without magnetization of spray solution as sub plots. The results showed significant effect of the herbicide spraying solution by increasing efficiency of herbicide absorption by weeds and decreasing its density and biomass on the unit area. The weed control percentage used at half recommendation for the herbicide with magnetization has exceeded use of full recommendation concentration without a magnetization. The response of the cultivars to herbicide spraying treatments were various according to different susceptibility of the weeds competition and different growth season. Key words : Magnetic water, herbicide, wheat cultivars. Introduction Wheat (Triticum aestivum L.) is one of the most important grain crops in Iraq and the world. It occupies the first place in terms of importance and area of cultivation. However, it weak competitor to weed associated compared to other cereal crops. Weed control is an important process to increase the yield, and susceptibility of some wheat varieties to impeding the growth of weed control is great importance in completion and integration of weed management process in crop fields such as wheat (Alziadee, 2015). Chemical herbicides are one of the most important means of reducing competition for economic yields, but their frequent use leads to health and environmental problems (Slomy, 2014). Controlled of weed using the chemical herbicides provides necessary requirements for the growth of crop so as to make it possible to store surplus of dry material resulting from net photosynthesis in several parts of plant, such as stems, leaves and roots, and converts a section of this gasoline into grain when starting grain filling operations, that affects quotient and its components (Safi, 2016). Iodosulfuron-mesosulfuron, which belongs to the Sulfonyl-urea group is one of the most important herbicides used in weed control of narrow and broad leafed in wheat fields, both soft and durum, barley and triticale. Rate of growth of the species and the morphological, physiological and biochemical factors are among the factors attributable to the variation in the competitiveness of the varieties of wheat in the accompanying. (Shati, 2014). Varieties of wheat have differed in the competitiveness of their associated ad factory and the existence of weed that has caused a clear reduction in the qualities of growth and the quantity of the items under study (Al-Chalabi and Al- Agidi, 2010). Appling magnetic water technology has emerged in agriculture (magnetic technology), or so-called magnetic bio stimulation to raise crop productivity through the creation of desirable stimulation such as the