الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 191 |  |  |
| | | from | 191 | | |
Abstract
1- In case of soil pollution with insoluble heavy metals (carbonate form):
1) DTPA-extractable Ni, Cd, Cu metals increased while Zn-decreased with increasing insoluble metal concentration in the tested soil.
2) Plants (barley and fenugreek) could release and uptake Ni, Cd, Cu and Zn metals from their insoluble form (carbonate).
3) The cumulative uptake and rates of release of these metals increased as the concentration of these metals in the clayey soil increased.
4) The efficiency rates of metals uptake by plants decreased with increasing insoluble metal concentration in the tested soil.
2- In case of soil pollution with soluble heavy metals under the effect of the tested amendments additions:
1- Nickel-polluted soils:
A) In case of barley cultivation (monocotyledons): Gypsum amendment addition was effective in remediating Ni-polluted soils followed by CaCO3 amendment; whereas, CaHPO4 and NH4H2PO4 (MAP) are not recommended in remediating such soils since it raised Ni-uptake rates from 3.65 in non-amended soils to 5.27 and from 4.57 to 11.44 µg/pot/day for the first and second amendment, respectively.
B) In case of fenugreek cultivation (dicotyledonous): The efficiency of the tested amendments in remediating Ni-polluted soils were in the order: Gypsum > CaHPO4 > CaCO3; whereas, addition of MAP amendment is not recommended because it raised Ni uptake rates from 1.47 in non-amended soils to 3.34 and 4.78 µg/pot/day at 1% and 2% addition rates, respectively.
2- Cadmium-polluted soils:
In case of barley and fenugreek cultivation: The effectiveness of the tested amendments in remediating Cd-polluted soils were in the order: MAP > CaCO3 > gypsum; whereas, addition of CaHPO4 is not recommended because it raised Cd- uptake rates and Cd-uptake efficiency of both barley and fenugreek.
3- Copper-polluted soils:
A) In case of barley cultivation (monocotyledons): The effectiveness of the tested chemical amendments in remediating Cu-polluted soils were in the order: CaCO3 > gypsum > CaHPO4 > MAP.
B) In case of fenugreek cultivation (dicotyledonous): The effectiveness of the tested amendments were in the order: MAP > CaCO3 > gypsum > CaHPO4.
4- Zinc-polluted soils:
In case of barley and fenugreek cultivation: the efficiency of the tested amendments in remediating Zn-polluted soils were in the order: MAP > CaCO3 > gypsum. Whereas, addition of CaHPO4 in remediating Zn-polluted soils must be avoided, since its application led to raising Zn-uptake rates values and Zn-uptake efficiency as compared to non-amended soils.