Zein, F.I., Hamida, M.A. El-Sanafawy, N.I. Talha And Samia A. Salama ( 2009). Using Canola Plants For Phytoextracting Heavy Metals From Soils Irrigated With Polluted Drainage Water For A Long TermJ. Agric. Sci. Mansoura Univ., 34 (6):7309 -7323
Abstract: Canola Brassica napus Seru-4 variety was grown in lyzimeter experiment at Sakha Agric. Res. Station during 2008/2009 season to study the metal accumulation and it’s feasibility of it’s use for metal phytoextraction. Also, chosen to study the content of roots, stems, leaves, seeds and oils of heavy metals Mn, Cu, Zn, Ni, Cd and Pb as affected by water treatments Lyzimeters (100 x 70 x 90 cm) were field with clayey soil and irrigated with three water treatments since 1987 twenty years ago. They were W1, Nile water (good water quality) and W3, drainage water (relatively poor water quality) and W2, mixed water 50% W1 + 50% W3. Complete randomized block design with four replicates was used for statistical analysis.
The obtained results showed that:
• Using poor water quality for irrigation increased ECe, SAR, soluble cations and anions in soil paste extract and total DTPA extractable heavy metals in soils (Mn, Zn, Cu, Ni, Cd and Pb) than that of mixed or good water quality.
• No significant effect of water treatment was found on plumule length swelling coefficient, hydration coefficient, crude fat, ash, relative density percent of canola seeds.
• The best main radical length and crude protein were obtained in seeds of canola plants irrigated with drainage water.
• Content of the studied heavy metals were in the following order: roots > stems > leaves > seeds > oils and greater when poor water quality (W3) was used for irrigation water.
• Highly significant differences were found between means of heavy metal content in canola plant due to irrigation water treatment.
• Canola oils which extracted from seeds were the least content of studied heavy metals in canola plant organs.
• Canola behaved as an accumulator for heavy metals such as Zn, Mn, Cd, Ni and Pb and is useful for metal phytoextraction due to higher metal accumulation capacity.
Keywords: (Phytoremediation, remediation, heavy metals, polluted soils, canola phytoextraction)
