Evaluation the use Caspian Seawater for Irrigation Green pepper under Greenhouse Conditions

In arid and semi-arid regions due to restriction of access to fresh water resources for agricultural production, the major source of irrigation water is salt water. The goal of this study was to the effect of irrigation by Caspian Sea water on yield and yield components green pepper (Capsicum annum) variety of green Hashemi ingreenhouse conditions. the research was done based in completely randomized design including 3 replications as pot planting in Gorgan University of Agricultural Sciences and Natural Resources during 2015. In this study salinity factors consist of 5 levels (0, 10, 20, 30 and 40 percent of the mixing sea water and tap water). The results showed that effect of irrigation water salinity on shoot fresh and dry weight, number of fruit per plant, yield and fruit fresh weight were highly significant (p>0.01), but steam diameter and Water use effeciency were significant at 5 percent level. the result showed that increasing salinity decreased all characteristic measured, the result showed that increasing 10 percent mixing of sea water tap water has resulted to decreasing of yield 46.9 percent, respectively. The result showed that the use of mixing sea water and tap water, to irrigate green pepper can not be used.