This study was carried out to investigate the effects of irrigation water containing different Clon plant growth parameters, fruit yield and quality characteristics of pepper (C. annuum L. cv. Postal Capija).Nutrient solutions containing Clconcentrations were applied to processing pepper plants and effects of Clon growth parameters, fruit yield and quality traits, leaf water potential and chloride contents were determined. Greenhouse experiments were conducted with the Clconcentrations [control (0.27), 1.5, 3.0, 4.5, 6.0, 7.5 and 15.0 mM] were applied to pepper plants. Plant height, fresh and dry weight, fruit yield and fruit weight, length and diameter were not affected by increasing Clconcentrations up to 3.0 mM, but further increases in Clconcentration negatively influenced this results. The greatest dry matter and soluble solids content were obtained from 3.0 and 4.5 mM Cltreatments. Increasing Clconcentration increased fruit acid content; the greatest acid content was from the greatest Clconcentration. Increasing growing media Clconcentration increased leaf Claccumulation and Clconcentration >3.0 mM reduced leaf water potential. Research results showed that Clconcentrations in irrigation water are important for efficient and economical pepper cultivation, and using water containing more than 3.0 mM chlorine will jeopardize yield and quality.-