Shading Impact on Qualitative Characteristics And

Light intensity is considered a limiting factor in greenhouse roseproduction. the main aim of this experiment was to evaluate the effect ofshading treatments (0, 25, 50, and 65% shading) on quality and chlorophyllcontent of cut rose (rosa hybrida cv. avalanche), under greenhouse conditions.the experiment was planned in randomized completely block design with fourreplications. all shoots were bent downwards from above the second bud afterremoving the young flower bud. shading significantly affected on bud sprouting,flowering stem fresh and dry weight and flowering stem diameter, so thatearliest bud sprouting, highest flowering stem, fresh and dry weight andflowering stem diameter were observed in no shading treatment. however,shading had no significant effect on flowering stem length and leaf area, butspecific leaf area increased with shading percentage increment at 65% shade.results of total chlorophyll content as well as chlorophyll a and b showed adecrement with increasing of shading percentage. in general, shading could bea cause of low-quality in cut roses; therefore greenhouse roses growers shouldconsider greenhouse architecture to maximize light deep penetration.