the allelopathic effects of sinapis alba l., achillea millefolium l.,

in the recent years application of allelopathic effects in weeds managment have attracted the attention of many researchers. to study the effects of water extracts and various amount of plants powder of sinapis, achillea, salvia, artemisia and wanut leaf on seed germination and seedling growth of bean, two separate factorial experiments were carried out in completely randomized design, with 3 and 5 replications, under laboratory and greenhouse conditions in the agricultural research center western azerbayjan. in the first experiment, five concentrations of weeds water extracts including 0 (control), 2.5, 5, 7.5 and 10 percents was applied on bean seeds. with increasing in concentration of sinapis, achillea and salvia germination percentage of bean was decreased but artemisia and salvia hadn’t any effects on the germination. the most preventing effect on radicle and plumule lengths of bean were observed respectively in 90.5 and 83.2 percents with 10% sinapis concentration. in second experiment soil of the pots was extended with plants powder in rates of 0, 0.33, 0.67, 1 and 1.33 percent. decrease in plant height and leaf area were in salvia, with 35.6% and 57.1%, respectively. salvia concentration of 40 gr in soil, decreased total dry matter with 54% control, but walnut leaf with amounts of 10, 20, 30 gr in soil increased than total dry matter. existence of more than 30 gr salvia and 40 gr artemisia in the soil decreased 33.7% root dry weight compared to control. 40gr salvia in soil decreased the dry weight of the seed from 452.6mg (control) to 257.6mg.