The effect of salinity and weed allelopathic extract Amaranthus retroflexus and chenopodium album on growth and production of pharmaceutical active Valeriana officinalis

Stress، particularly the combination of them reduction in plant growth and development. However، herb plants have shown resistance to stress. The purpose of this review، the study of the interaction region is important to extract Amaranthus retroflexus and chenopodium album and salinity on germination، growth and yield of root essential oil on valerian. Treatment was extracts of different weeds parts (root، shoot، total plant and control) Salinity levels also defined as control، 4، 8 and 12 ds/m. Maximum negative effect was shoot extract in witout sailinty and 12 ds/m sailinty on germination percent، root، shoot length and leaf area in 4،8 month after emergence and root dry weight. 8 and 12ds/m sailinty reducing germination percent، shoot and root length and leaf area for eight months after emergence، leaf dry weight and root dry weight also. But 4 ds/m salinity drop leaf area in eight months after the green and dry weight of leaves. 4 ds/m salinity only for oil increased.