The effects of two differing organic
amendments on OM mineralisation and fractionation of heavy metals in a contaminated soil were investigated in an incubation experiment.
The treatments were: control unamended soil, soil amended with fresh cow manure, and soil amended with a compost having a
high maturity degree. The soil used was characteristic of the mining area at La Unio´n (Murcia, Spain) with 28% CaCO3 and sandy-loam
texture (pH 7.7; 2602 mg kg1 Zn; 1572 mg kg1 Pb). Manure and compost C-mineralisation after 56 days (24% and 3.8%, respectively)
were below values reported previously for uncontaminated soils. Both amendments favoured Zn and Pb fixation, particularly the manure.
Mn solubility increased at the beginning of the experiment due to a pH effect, and only Cu solubility increased through organic
matter chelation in both amended soils.
2005 Elsevier Ltd. All rights reserved
The effects of two differing organic
amendments on OM mineralisation and fractionation of heavy metals in a contaminated soil were investigated in an incubation experiment.
The treatments were: control unamended soil, soil amended with fresh cow manure, and soil amended with a compost having a
high maturity degree. The soil used was characteristic of the mining area at La Unio´n (Murcia, Spain) with 28% CaCO3 and sandy-loam
texture (pH 7.7; 2602 mg kg1 Zn; 1572 mg kg1 Pb). Manure and compost C-mineralisation after 56 days (24% and 3.8%, respectively)
were below values reported previously for uncontaminated soils. Both amendments favoured Zn and Pb fixation, particularly the manure.
Mn solubility increased at the beginning of the experiment due to a pH effect, and only Cu solubility increased through organic
matter chelation in both amended soils.
2005 Elsevier Ltd. All rights reserved
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