Allelopathic effects of Thymus caramanicus.Jalas on some vegetative indexes of Amygdalus scoparia Spach

Some plants have negative effects on growth of the adjacent plants through excretion chemical compounds known as allelopathy. In order to cultivate Thymus caramanicus and Amygdalus scoparia (Agroforestry), this research was performed under laboratory conditions to determine the allelopathic effects of aerial extracts of Thymus caramanicus on some vegetative traits of Amygdalus scoparia in a completely randomized design with 3 replications. The results showed that different water extract concentrations of aerial parts of Thymus caramanicus had no significant effects on fresh and dry weights of underground parts of Amygdalus scoparia. However, germination percentage and fresh aerial weight were negatively affected at 50 and 100 gr/lit respectively. For other vegetative traits (germination rate, radicle length and aerial dry weight), 25 gr/lit was identified as the start of allelopathic effect. Since a threshold of allelopathic effect of Thymus caramanicus on different traits of Amygdalus scoparia was identified in this research, investigation on the same under natural conditions and different phonological stages is recommended.