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Abstract Tartil Mohamed Emam Ragab: Effect of Application of Seaweed Extract on Growth and Quality of Some Ornamental Plants. Unpublished M.Sc. Thesis, Department of Horticulture, Faculty of Agriculture, Ain Shams University, 2016. This study was conducted in the vicinity of both the Faculty of Agriculture, Ain Shams University, Shobra El-Kheima and the Ornamental Plants Nursery and Greenhouses of the Ministry of Irrigation, El-Kanater El-Khairia, Qalubia governorate, Egypt during the two successive seasons of 2012-2013 and 2013-2014.The aim of this investigation was to study the response of three different ornamental plant species,i.e. Pot marigold (Calendula officinalis), African marigold (Tagetes erecta) and Begonia (Begonia sempervirens)to different application methods and concentrations of seaweed extracts from a commercial compound. Three separate experiments were carried out in the open field in the case of Calendula and Tagetes and in the greenhouse for Begonia. All in all, seven treatments were initiatedfrom three concentrations of seaweed extracts (500, 1000 and 1500 ppm) either as foliar spray or as soil drench application in addition to the control treatment (tap water). Thetreatments were applied three times.The experimental design was of a randomized complete block in each experiment. Results indicated that foliar spray with 1500 ppm of seaweed extracttopot marigold plants increased significantly plant height, number of flowers per plant and vase life in the two tested seasons. However, foliar spray with the lowest concentration of seaweed extract (500 ppm) resulted in significant increments in flower stalk length, flower diameter and carbohydrates content. Moreover, the same concentration showed significant increases in total carotenoids, nitrogen, and phosphorus percentage when used as soil drench in the two tested seasons. Regarding African marigold, results showed also that 1500 ppm led to the highest significant values of plant height, vase life and phosphorus content when used as foliar spray or as soil drench while 500 ppm as foliar spray improved significantly number of flowers/plant. Moreover, 1000 ppm as foliar spray showed significant influence in total carbohydrates, carotenoids content and total chlorophyll. But 1000 ppm as soil drench revealed higher significant N and Mn contents in plants. As for Begonia, plant height, dry weight / plant and total carbohydrates increased significantly with the application of seaweed extract with 500 ppm applied as soil drench. Anthocyanin content was increased with soil drench application of seaweed extract at 1500 ppm. On the other side the same concentration gave the highest values of N, P, K, Fe and Zn when used as foliar spray.Meanwhile, 1000 ppm as foliar spray increased Mn content. Keywords: Pot marigold, Calendula officinalis, African marigold, Tagetes erecta, Begonia sempervernis, Seaweed extracts, Vegetative growth, Flowering, Carbohydrates, Chlorophyll, Carotenoids, Anthocyanin Nitrogen, Phosphorus. |