الفهرس 
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Abstract
A pot experiment was conducted at Antoniadis Garden, Hort. Res. Inst. Alex. Branch, Ministry of Agric., Egypt to study the combinations effect of Cd and Pb at different levels during the period of 1st April 2020 to 1st August 2021 on vegetative growth, chemical composition and phytoextraction potential of Jatropha curcas and Jacaranda mimosifolia plants, as well as, the soil properties after the experimental period.
The treatments were conducted as follows: 1- control. 2- L Cd + L Pb (Cd nitrate and Pb nitrate at 40 and 400 mg/kg soil, respectively). 3- M Cd + M Pb (nitrate of Cd and Pb at 80 and 800 mg/kg soil, respectively). 4- H Cd + H Pb (nitrate of Cd and Pb nitrate at 120 and 1200 mg/kg soil, respectively). 5- L Cd + H Pb. 6- H Cd + L Pb. 7- M Cd + H Pb. 8- H Cd + M Pb. The experimental design was randomized complete design (RCD). The results could be summarized as follows: Effect of Cd and Pb treatments on vegetative traits, chemical composition and phytoextraction potential of jatropha and jacaranda plants, also soil characters after the plantation. 5.1. Aerial parts traits: • The two species tolerated Cd and Pb till the highest concentrations with survival 100%. • All treatments of Cd and Pb in the most cases caused significant reduction in plant height, stem diameter, branches number, area/leaf and fresh and dry weights of leaves and stems in relative to the control of two plant kinds. The values of such traits were related with the levels of HMS in the treatment. 5.2. Root parameters: • The length of the longest root and roots fresh and dry weights of the two species were negatively affected by all used combinations of Cd and Pb in comparison to the control treatments, with one exception in case of L Cd L Pb which resulted in nonsignificant increase in the root length of jatropha over than the control. • The differences among the applications treatments of Cd and Pb did not reach the significant level in the most cases of such traits for the two species.