In Jebel Ressas mining area (Southern of Tunisia), the dispersion of particles that contain Pb, Zn and Cd
results in the contamination of the surrounding agricultural soils. These soils have high concentrations of
Pb (970 mg kg1
), Zn (9641 mg kg1
) and Cd (53 mg kg1
). This glasshouse study examined the effect of
application of fertilizers, i.e., organic fertilizer as local sheep manure and inorganic fertilizer as potassium
chloride (KCl), on the growth, uptake and translocation of Cd, Pb, and Zn of alfalfa (Medicago sativa L.)
grown on a contaminated soil. Obtained results showed that alfalfa could tolerate high Cd, Pb, and Zn
concentrations in soil and had very good growth performance. Regarding to biomass generation it was
observed, in every case, that plant growth is not affected in the treated soil compared with blanks sown
in an untreated control soil; improvement ranged from 80% for the KCl to 97% for sheep manure.
Application of sheep manure increased electrical conductivity and reduced DTPA-extractable metal
concentrations in the soils. But KCl fertilizer favored their accumulation in plants. So, KCl could be a
useful amendment for phytoextraction of metals by accumulator species, while sheep manure can be
very useful for phytostabilisation
In Jebel Ressas mining area (Southern of Tunisia), the dispersion of particles that contain Pb, Zn and Cdresults in the contamination of the surrounding agricultural soils. These soils have high concentrations ofPb (970 mg kg1), Zn (9641 mg kg1) and Cd (53 mg kg1). This glasshouse study examined the effect ofapplication of fertilizers, i.e., organic fertilizer as local sheep manure and inorganic fertilizer as potassiumchloride (KCl), on the growth, uptake and translocation of Cd, Pb, and Zn of alfalfa (Medicago sativa L.)grown on a contaminated soil. Obtained results showed that alfalfa could tolerate high Cd, Pb, and Znconcentrations in soil and had very good growth performance. Regarding to biomass generation it wasobserved, in every case, that plant growth is not affected in the treated soil compared with blanks sownin an untreated control soil; improvement ranged from 80% for the KCl to 97% for sheep manure.Application of sheep manure increased electrical conductivity and reduced DTPA-extractable metalconcentrations in the soils. But KCl fertilizer favored their accumulation in plants. So, KCl could be auseful amendment for phytoextraction of metals by accumulator species, while sheep manure can bevery useful for phytostabilisation
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