A field experiment was carried out in order to evaluate the effect of planting date, method and date of weed control on weed density and biomass in the experimental research field, Faculty of Agriculture, during 2006. Treatments included planting date (30 December, 20 January and 30 February), weeding date first true leaf, start of branching and beginning of flowering stages) and weed control methods (hand weeding, fire treatment and control). The results showed that there were significant differences in weed density between different weed control methods. There were also differences in weed population between dates of weed control, as the lowest weed density was observed in treatment of flowering stage. Weed biomass was significantly different between treatments of date and methods of weed control. Hand weeding at beginning of flowering stage caused lowest weed dry weight.

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