Hyperaccumulator oilcake manure as an alternative for chelate-induced phytoremediation of heavy metals contaminated alluvial soils.
The ability of hyperaccumulator oilcake manure as compared to chelates was investigated by growing Calendula officinalis L for phytoremediation of cadmium and lead contaminated alluvial soil. The combinatorial treatment T6 [2.5 g kg(-1) oilcake manure+5 mmol kg(-1) EDDS] caused maximum cadmium accumulation in root, shoot and flower up to 5.46, 4.74 and 1.37 mg kg(-1) and lead accumulation up to 16.11, 13.44 and 3.17 mg kg(-1), respectively at Naini dump site, Allahabad (S3). The treatment showed maximum remediation efficiency for Cd (RR=0.676%) and Pb (RR=0.202%) at Mumfordganj contaminated site (S2). However, the above parameters were also observed at par with the treatment T5 [2.5 g kg(-1) oilcake manure +2 g kg(-1) humic acid]. Applied EDDS altered chlorophyll-a, chlorophyll-b, and carotene contents of plants while application of oilcake manure enhanced their contents in plant by 3.73-8.65%, 5.81-17.65%, and 7.04-17.19%, respectively. The authors conclude that Calendula officinalis L has potential to be safely grown in moderately Cd and Pb-contaminated soils and application of hyperaccumulator oilcake manure boosts the photosynthetic pigments of the plant, leading to enhanced clean-up of the cadmium and lead-contaminated soils. Hence, the hyperaccumulator oilcake manure should be preferred over chelates for sustainable phytoremediation through soil-plant rhizospheric process.
a Sheila Dhar Institute of Soil Science, Department of Chemistry , Allahabad , India.
Dinesh
D
Mani
Chitranjan
C
Kumar
Niraj Kumar
NK
Patel
D001673:Biodegradation, Environmental; D002104:Cadmium / Q000378:metabolism*; D020838:Calendula / Q000737:chemistry / Q000378:metabolism*; D052918:Environmental Restoration and Remediation / Q000295:instrumentation / Q000379:methods*; D007854:Lead / Q000032:analysis / Q000378:metabolism*; D008372:Manure / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism*
D008372:Manure; D012989:Soil Pollutants; D002104:Cadmium; D007854:Lead
Calendula officinalis L; EDDS; cadmium; humic acid; lead; oilcake manure; photosynthetic pigments; remediation ratio