الفهرس 
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Abstract
The experiment was carried out at the wetland of National Research Centre, Dokki, Cairo, Egypt, during the seasons of 2021-2022.
The experiments included three different parts dealt with 4 different plants.
In the first part two different plants were used, namely Vetiveria zizanioides (L.) and Phragmites australis, the irrigation regime was applied after two weeks from transplantation and the quantity of water was adjusted to reach field capacity. Grey water and black water were used in irrigation by collecting them through a sedimentation tank, using the horizontal and vertical Constructed Wetlands.
The second part studied the effect of grey water on soil planted with Yucca gloriosa (L.). The experiment consisted of 4 different treatments, control, (50% grey water: 50% tap water), (67% grey water: 33% tap water), (75% grey water: 25% tap water), (100% grey water).
The application of irrigation levels of 67% and 75% affected on all vegetative growth, except stem diameter. The highest values, in all studied traits, were with the application of 67% followed by 75%. Also, all irrigation levels of gray water affected on all the studied traits of chemical content. Whereby, the highest content of all studied traits; viz, carbohydrates, chlorophyll b and proline, were recorded with the application of 75% grey water, except protein and chlorophyll a. The highest values for carbohydrates were recorded with the application of 50% and 75% of gray water.
The third part studied the effect of zinc and selenium on the vegetative growth, and chemical content of Cordyline fruticosa (L.), the treatment consisted of (Control: without additives, 1 mg/L: zinc and selenium, 3 mg/L: zinc and selenium, and 5 mg/L: zinc and selenium), The highest gained values of all vegetative growth traits were recorded applying 1 mg/L of zinc and selenium. Meanwhile the chemical content highest values of all traits were recorded applying 1 mg/L and then 3 mg/L of Zinc and selenium.