عنوان مقاله [English]
In order to investigate the effect of supplemental irrigation on the yield of Echium Amoenum Fisch, a randomized block design with four replications was conducted during the growing season of 2014-2015 in the research farm of the agricultural and natural resources research center of Gilan. Three irrigation treatments (dryland, one supplementary irrigation (stem elongation stage) and two supplementary irrigation (stem elongation stage and flowering stage) were considered. The results showed that two supplementary irrigation treatments had maximum values in almost all Vegetative traits, while in reproductive traits; supplementary irrigation treatment had higher values. The yield of fresh weight of flowers and dry flower weight were as maximum yield in the treatment of supplementary irrigation. Supplementary irrigation treatment had maximum values in water use efficiency. Therefore, in the conditions of the study area and similar areas, supplementary irrigation has a high potential for both irrigation and yielding water efficiency and can be considered seriously.