اثر روش‌های مختلف مدیریت تلفیقی بر ویژگی‌های علفهایهرز و عملکرد چغندرقند

In order to compare different weed management methods in sugar beet, an experiment was conducted at the Agricultural Research Station, Ferdowsi University of Mashhad, Iran, during 2006-2007 and 2007-2008. The experiment designed as a Complete Randomized Block with three replications. The treatments including: Metamitron + Fenmedifam, Metamitron + Fenmedifam + rotation, Metamitron + Cultivation, Metamitron + Cultivation + rotation, Disk + fenmedifam, Disk + fenmedifam + rotation, Disk + cultivation, Disk + cultivation + rotation, Covercrop + Fenmedifam, Covercrop + Cultivation, Hand-Weeding and Hand- Weeding + Fenmedifam. In the first year, apart from rotation treatments, the highest and Lowest weed density were obtained in Disk + Cultivation (33 plant.m-2) and Hand-Weeding + Fenmedifam (20.1 plant.m-2). In this year maximum amount of weed dry matter was seen in Disk + Fenmedifam with 89.2 g.m-2 and minimum dry matter of weed was showed in Hand-Weeding + Fenmedifam with 22.2 g.m-2. In second year maximum and minimum weed density were showed in Metamitron + Fenmedifam with 142.6 plant.m-2 and Hand-Weeding with 21.5 plant.m-2, respectively. In this year highest and Lowest dry matter of weed were obtained in Metamitron + Fenmedifam and Hand-Weeding + Fenmedifam with 204 and 30.3 g.m-2, respectively. In first year maximum and minimum sugar beet yield were obtained with Hand-Weeding and cover crop + Fenmedifam with 114 and 43.6 ton per hectare, respectively. In second year highest and lowest sugar beet yield were obtaned with Hand-Weeding and Metamitron + Fenmedifam with 94.4 and 28.3 ton per hectare, respectively. Maximum sugar contains in first and second year were obtained in Disk + cultivation (19.7) and Disk + Fenmedifam (18.3).