Journal of Food, Agriculture and Environment

Metal accumulation in earthworms (Oligochaeta: Lumbricidae) in fertilization with swine sludge

Author(s):

Mădălina Iordache

Recieved Date: 2012-07-09, Accepted Date: 2012-10-03

Abstract:

The study intended to distinguish the metal accumulation in earthworm tissues (Fe, Mg, Ni) after fertilization with swine residual water (50 m³·ha^-1). The study was conducted in a Chernozem (FAO System), in culture of Zea mays L. The collected data consisted of soil analyses on two depth intervals: 0-10 cm and 10-20 cm, respectively, and earthworm tissue analyses to establish the metal uptake by earthworm species. Earthworms were extracted from soil using formaldehyde solution according to the international standard ISO 23611-1/2006. The content of metals in soil were determined by flame atomic absorption spectrometry. The earthworm number and weight considerably increased in treatments fertilized with swine residual water, confirming once again the earthworms’ preference for the organic matter provided by the residual water. Regarding the accumulation of the investigated metals, the species Lumbricus castaneus showed in its tissues the lowest concentration of metals, and Lumbricus rubellus the highest one. Considerably lower concentrations in earthworm tissues were found as compared with the adjacent soil in all analyzed species. In the soil fertilized with swine residual water, chemical analyses were made for depth 0-20 cm for the following parameters: pH, total organic carbon, phosphorus and potassium and connections existing between these and earthworm number and weight were studied as well. The statistical correlations (Pearson, Kendall and Spearman) between earthworm number and weight and soil parameters showed positive relations for total organic carbon, phosphorus and potassium and negative relation for pH. 

Keywords:

Iron, magnesium, nickel, pH, total organic carbon, phosphorus, potassium, swine residual water, Lumbricus rubellus, Lumbricus castaneus, Allolobophora rosea

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Environment
Pages: 1008-1010

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