University of Tabriz Journal of Plant Physiology and Breeding 2008-5168 14 2 2024 12 01 The impact of herbicides on weed control and physiological traits in corn (Zea mays L.) 169 179 20044 10.22034/jppb.2024.60403.1329 EN Rasoul Fakhari Plant Protection Research Department, Ardabil Agricultural and Natural Resources Research and Education Center, AREEO, Moghan, Iran Noushin Nezamabadi Iranian Research Institute of Plant Protection (IRIPP), Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran Sajjad Moharramnejad Crop and Horticultural Science Research Department, Ardabil Agricultural and Natural Resources Research and Education Center, AREEO, Moghan, Iran Ghorban Didehbaz Moghanlo Plant Protection Research Department, Ardabil Agricultural and Natural Resources Research and Education Center, AREEO, Moghan, Iran Journal Article 2024 02 03 <strong>Objective</strong>: This research aimed to evaluate the effect of herbicides on weed control and physiological traits in corn (<em>Zea mays</em> L.).<br /><strong>Methods</strong>: An experiment was performed using a randomized complete block design with four replications at the Agricultural and Natural Resources Research Center of Moghan, Iran, during the 2021 growing season. The herbicides included Amaize-ing (Terbuthylazine, 50% SC) at the rates of 1, 1.2, 1.5, 1.8, and 2 L/ha, Isoxaflutel + Tincarbazone (Adango 46.5% SC), Mesotrione + S-metolachlor + Lumax (Lumax 53.75% SE), U46 Combi Fluid (2,4-D + MCPA 67.5% SL), Bromicide MA (Bromoxynil + MCPA 40% EC), and Bromicide MA (Bromoxynil + MCPA 40% EC) + Cruze (Nicosulfuron 4% SC).<br /><strong>Results</strong>: The analysis of variance revealed a significant difference among treatments in terms of weed density, weed dry weight, corn grain yield, chlorophyll index (SPAD), leaf weight, proline, and catalase activity. The use of 1.8 and 2 L/ha concentrations of Amaize-ing, Adengo, Lumax, U46 Combi Fluid, Bromicide MA, and Bromicide MA + Cruze herbicides had a favorable effect on redroot pigweed and common lambsquarters. It resulted in a 20 to 30% increase in corn yield. The highest chlorophyll content and leaf weight of corn were associated with treatments of Adengo, Lumax, U46 Combi Fluid, Bromicide MA, and Bromicide MA + Cruze. However, the Amaize-ing herbicide had a smaller effect on the leaf weight of corn. Also, increasing the concentration of Amaize-ing increased the proline content and activity of catalase in corn.<br /><strong>Conclusion</strong>: In conclusion, it seems that the use of 1.8 L/ha of A-mazing and Adengo herbicides can have an effective role in controlling weeds, leading to an increase in leaf weight, photosynthetic capacity, and ultimately corn grain yield. https://breeding.tabrizu.ac.ir/article_20044_f000c19df773996acdb555a82a3d5a46.pdf