Evaluation of different weeders performance for controlling weeds in rice field

In order to comparison of different mechanical control methods of weed of rice field, a field experiment was carried out in Babol city- during 2011. The experiment in the basis of randomized complete block design with four treatments in three replications including powered weeder, conoweeder weeder, hand weeding and no weeding were used. Number of weeds was counted before and after weeding. There was significant effect among treatments on grain yield, weeding efficiency, number and dry weight of weeds after weed control. There was not any significant different between powered and conoweeder weeder regarding weeding efficiency, while there was significant different with hand weeding treatment. Number and dry weight of weeds forhand weeding was least. Average field capacity for powered weeder was 0.025 ha/h. Regarding economical considerations, powered weeder and hand weeding had the highest (5.86 percent) and least (1.68 percent) efficiency respectively. Therefore, treatments were ranked from powered weeder, conoweeder weeder and powered weeder, respectively.