الفهرس 
Response of Mahogany and Taxodium Tree Seedlings to Bio-stimulants and Growth Regulators Under Irrigation with Wastewater Conditions.
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Abstract
Two pot experiments were carried out to study the effect of treated wastewater (TWW) on mahogany and taxodium tree seedlings and the role of bio-stimulants in alleviating the harmful impacts, using –6- months’ old seedlings.
The first experiment: irrigating mahogany seedlings with 25TWW significantly increased plant height, improved the formation of leaves, fresh weight of leaves. 50%TWW gave the heaviest fresh and dry weights of leave and roots diameter, total phenols, free proline and total soluble sugars. Irrigation with of 75WW/25PW+ GABA increased stem fresh weight, whereas 50WW/50PW + GABA produced the highest dry weight of leaves. Putresceine and GABA gave the highest proline content and Pot. Silicate and GABA gave the highest sugar content. The contents of lead and cadmium were highest with 75%TWW. Salicylic acid and fulvic acid increased the accumulation of Pb, whereas salicylic acid and seaweed extract increased the accumulation of Cd. The highest content of lead recorded under 75WW/25PW +SA, but the highest Cd-content was recorded under 50WW/50 PW+FA and 75WW/25 PW + SA.
The second experiment: The formation of leaves was significantly increased with 75%TWW. Also, it increased the fresh and dry weights of stems, and significantly produced the heaviest dry weight of leaves. total soluble sugars under 50WW/50PW treatment, was the highest, meanwhile the contents of total phenols and total flavonoids in leaves were higher when seedlings were irrigated with 50WW/50 PW. The seedling height, number of branches/ seedling, number of leaves, dry weight and root length, thickness and weight showed a great response to the foliar application of GAMA treatment. Plants treated with arginine significantly increased the root growth compared to the control, as well as the content of total soluble sugars and gave the highest content of flavonoids. The highest values of indoles were recorded with potassium humate, it enhanced the content of total soluble sugars, flvoniods and Total phenols of leaves.