نوع مقاله : مقاله پژوهشی
نویسندگان
1 محقق بخش تحقیقات گیاهپزشکی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان خوزستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، اهواز،
2 عضو هیئت علمی مرکز تحقیقات کشاورزی همدان
3 تهران ولنجک موسسه تحقیقات گیاه پزشکی کشور
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
In order to evaluate the herbicide imazamox (Immertar Xtra® WG 70%) on weed control in new-seeded alfalfa, an experiment was done in Karaj, Hamedan, and Ahwaz during 2021-2022 in a randomized complete block design with 4 replications and 11 treatments. Herbicide treatments, all applied in alfalfa at the 8-leaf stage, included: 2,4-DB (Butress® SL 50%) at 3 and 3.5 L ha-1, imazethapyr (Pursuit®) at 1 L ha-1 and 0.4 L ha-1+ citogate 2%, imazamox (Immertar Xtra® WG 70%) at 45, 50, and 55 g ha-1, imazamox (Immertar Xtra® WG 70%) at 40, 50, and 55 g ha-1 + citogate 2%, and weeding treatment. The effect of herbicides was evaluated on dominant weed density and biomass, and alfalfa yield during the first harvesting. Results showed that in Karaj, imazamox at 45 and 50 g ha-1 could suppress Descurainia sophia, Chorispora tenella, and Veronica persica by more than 80%. However, in Hamedan, Lactuca serriola and Carduus pycnocephalus were not controlled under the effect of imazamox. In Karaj and Hamedan, imazamox at 50 g ha-1+ citogate 2% and imazamox at 50 and 55 g ha-1 caused the maximum increase (53 to 62%) in alfalfa yield. In Ahwaz, the efficacy of imazethapyr at 1 L ha-1 in increasing alfalfa yield (47%) was more than imazamox (32.5 to 38.5%) with and without citogate. Overall, imazamox had no phytotoxicity on alfalfa. Therefore, imazamox at 45 to 50 g ha-1 + citogate could be recommended for controlling broad-leaved annual weeds in new-seeded alfalfa
کلیدواژه‌ها [English]
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