Although each of these stress alone significantly affect the plant But if the interaction with other stress conditions, even in low situation plant ecosystems are able to change But little research has been to interference under stress. The aim of this experiment was interaction between biological and non biological stress, allelopathy and the salt that is applied to both the chemical impact on plants. Treatment was 4level salinity and weed organs extract (10 percent). The result showed that Organ extract treatment of weeds with greater deterrence, less impact on the salinity change is the result of interaction between stress. But in essence, low-intensity interference effect had much stronger deterrence. According this experimental result Both stress factors by reducing total number stem and non-fertile stems and stalks can reduce performance. The different characteristics of different intensity were affected by stress the different attributes of different intensity were affected by stress. the aim of this experimental was effect of extracts the Amartanthus retroflexus and Chenopodium album weeds, Different levels of salinity on germination and growth in Valeriana officinalis.
