In order to investigate the effect of different methods of integrated weed management on radiation use efficiency of sugar beet and different species of weeds, this experiment was conducted based on randomized complete block design with three replications in the Agricultural Research Station, Ferdowsi University of Mashhad in 2010. Treatments included Metamitron Herbicide + Fenmedifam

Herbicide, Metamitron H. + Fenmedifam H.+Rotation, Metamitron H. + Cultivation, Metamitron H. + Cultivation + Rotation, Disc + Fenmedifam H., Disc + Fenmedifam H. + Rotation, Disc + Cultivation, Disc+ Cultivation + Rotation, Cover Crop + Cultivation, Cover Crop + Fenmedifam H., Fenmedifam H. + Weeding, Weeding and Control (without management). Samples were taken by Sun Scan instrument after plants emergence at fifteen days intervals. Results showed that the highest differences between leaf area of sugar beet and weeds in different treatments were seen using Weeding, Weeding+Fenmedifam H. and Disk+Fenmedifam H.+Rotation. The smallest differences were observed in control and Metamitron H. and Fenmedifam H. The maximum and minimum dry matter aggregation obtained in Weeding and control at 140 days after planting. Among different weed species, Barnyardgrass (