To evaluate the effect of sowing density and sowing date on weed community of soybean (Glycine max L.), a field experiment was carried out during the spring 2009 at University of Zanjan as a factorial split plot on the basis of randomized complete block design, with three replications. Treatments were including factorial of sowing date at two levels (May, 27; and June, 9) and sowing density at three levels (low density (25 plants. m-2), optimum density (33 plants. m-2) and high density (50 plants. m-2)) as main plot and weed interference at two levels (control and without control) as sub plot. The results showed that maximum density of weeds obtains of second sowing date (27 May) and 25 plant.m-2 sowing density. Also narrow-leaf weed density and dry weight were more of broad-leaf weeds that were more in second sowing date (27 May) and 25 plant.m-2 plant density.

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