This study was conducted on the lentil cultivar Malazgirt 89 during 1999 and 2000 to determine the most appropriate method for controlling weeds. In the experiments, hand hoeing, trifluralin, imazethapyr, linuron, prometryn, phenmedipham + desmediphame, trifluralin + hand hoeing and linuron + hand hoeing which should be used as an alternative to hand weeding, were tested. The effects of herbicides on nodulation in lentils were also investigated. Centaurea depressa in the first year, and Ranunculus arvensis and Acroptilon repens in the second year were the dominant weed species encountered in the plots. A combination of linuron + hand hoeing, linuron alone and hand hoeing were the most effective methods for weed control. Trifluralin, imazethapyr and phenmedipham + desmedipham showed phytotoxic effects on lentils. None of the herbicides and methods used in the investigation had any adverse effects on nodulation, and Rhizobium leguminosarum inoculation was not found to have any effect on the competitive ability of weeds in lentils. © TÜBITAK.