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Tytuł pozycji:

Do soil amendments used to improve agricultural productivity have consequences for soils contaminated with heavy metals?

Tytuł:
Do soil amendments used to improve agricultural productivity have consequences for soils contaminated with heavy metals?
Autorzy:
Belinda Kaninga
Benson H. Chishala
Kakoma K. Maseka
Godfrey M. Sakala
Scott D. Young
R. Murray Lark
Andrew Tye
Elliott M. Hamilton
Amanda Gardner
Michael J. Watts
Temat:
Copperbelt
Lime
Manure
Mine tailings
Bioavailable metals
Agricultural soil science
Science (General)
Q1-390
Social sciences (General)
H1-99
Źródło:
Heliyon, Vol 6, Iss 11, Pp e05502- (2020)
Wydawca:
Elsevier, 2020.
Rok publikacji:
2020
Kolekcja:
LCC:Science (General)
LCC:Social sciences (General)
Typ dokumentu:
article
Opis pliku:
electronic resource
Język:
English
ISSN:
2405-8440
Relacje:
http://www.sciencedirect.com/science/article/pii/S2405844020323458; https://doaj.org/toc/2405-8440
DOI:
10.1016/j.heliyon.2020.e05502
Dostęp URL:
https://doaj.org/article/9309af8f9675495aa9c94ae45b07990b  Link otwiera się w nowym oknie
Numer akcesji:
edsdoj.9309af8f9675495aa9c94ae45b07990b
Czasopismo naukowe
This study presents an analysis of the effects of manure and lime commonly used to improve agricultural productivity and evaluates the potential for such soil amendments to mobilise/immobilise metal fractions in soils contaminated from nearby mine tailings in the Zambian Copperbelt. Lime and manure were applied at the onset of the study, and their effects were studied over two planting seasons, i.e. 2016-17 and 2017–18. Operationally defined plant-available Cd, Cu, Ni, Pb and Zn in the soil, were determined by extraction with DTPA-TEA (diethylenetriaminepentaacetic acid-triethanolamine) and 0.01 M Ca(NO3)2, before, and after, applying the amendments. In unamended soils, Cd was the most available and Ni the least. Lime application decreased extractable Cd, Cu, Ni, Pb and Zn. The response to lime was greater in soils with an initially acidic pH than in those with approximately neutral pH values. Manure increased DTPA extractable Zn, but decreased DTPA and Ca(NO3)2 extractable Cd, Cu and Pb. Combined lime and manure amendment exhibited a greater reduction in DTPA extractable Cd, Ni, Pb, Zn, as well as for Ca(NO3)2 extractable Cd compared to separate applications of lime and manure. The amendments had a significant residual effect on most of the soil fractions between season 1 and 2. The results obtained in this study showed that soil amendment with minimal lime and manure whilst benefiting agricultural productivity, may significantly reduce the mobility or plant availability of metals from contaminated agricultural soils. This is important in contaminated, typical tropical soils used for crop production by resource poor communities affected by mining or other industrial activities.

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