Effect of allelopathic extract of 4 medicinal plants on germination indices of Datura stramonium L.

This experiment was conducted in a completely randomized design with three replications in 2016 in Laboratory of Agricultural College, Mohaghegh Ardebili University. Medicinal plants included Artemisia sieberi L., Achillea millefolium L., Salvia officinalis L., Matricaria chamomilla and control (distilled water). The results showed that the medicinal plants extract significantly reduced germination percentage, length and dry weight of Datura stramonium L. seedling compared to the control. Among the medicinal plants, extract of Artemisia sieberi L., and Salvia officinalis L, compared with other extracts, reduced germination percentage by 32% and 24%, respectively, compared to the control. In the extracts of Artemisia sieberi L., and Salvia officinalis L, dry weight of Datura stramonium L seedlings decreased compared to other plants extracts. In general, these herbs, especially Artemisia sieberi L. and Salvia officinalis, can be used in rotational programs to reduce the presence of weeds.