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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/112

Title: Uptake and Phytoaccumulation of Chromium at Seedling Stage for Three Commonly Grown Tree Species in Ethiopia
Authors: Mehari, Alebachew
Date Added: 7-Sep-2007
Abstract: A pot culture culture experiment was conducted in the glass house of Holetta Agricultural Research Center (HARC) of, Ethiopian Institute of Agricultural Research (EIAR) based on Holetta.The aim of the trail was to study the impact of Cr on seed germination, seedling quality and growth, to establish in which part of the plants the metal is stored for an eventual use of phyto-stabilization and/or phytoextraction of the metals, and finally to screen and recommend the best Cr accumulator tree species for phytoremediation capabilities of the three tree species seedlings Viz.Eucalyptus camaldulensis, Millittia ferruginea, and Ricinus communis respectively. Both biological stable speciation of Cr (trivalent as Cr2 (SO4) 3.6H2O and hexavalent as (K2Cr2O7) at three concentration levels 10,100, 1000 PPm and the control were used. The plant growing media was prepared using, 3-forest soil, 3 local soils, 1 manure and 1 sand soil. Before sowing the media were mixed in appropriate proportion, moistened, sterilized and finally filled into polythen bags of 16cmx20cm diameter and height respectively, the already filled pots were taken into the green house and laid out with split plot design of CRD (completely randomised design) with 3 replications. The seeds were directly sown on polybags, germination data were recorded however the result was not significantly different for the two Cr species however it was differing significantly for different concentration of Cr and for the three tree species respectively .At the end of the experiment both seedling growth and quality parameters were assessed but the data statistically revealed that among the parameters height and root collar diameter significantly differed for the treatments at (P≤0.05) However seedling quality parameters was not significantly different among the same tree species where as there was significant difference recorded when the interaction effect of the three tree species was considered. For Cr data analysis the two parts of the plants were separately collected, oven dried, weighed, milled, and digested and separately analysed using Atomic Absorption Spectrophotometer (AAS) (Varian spectra AA-220) with air acethylene flame at 358 ηm with 0.2 spectral slit width. The shoots and roots of Ricinus communis showed a very good Cr storage capacity followed by Millittia ferruginea and Eucalyptus camaldulensis respectively. The shoots and roots accumulate nearly the same amount of Cr in all the tree species seedlings respectively. With regard to the uptake of Cr Ricinus communis was also the most efficient in its storage capacity as it contains the highest level of Cr per gram of dry matter.
Description: A THESIS SUBMITTED TO THE SCHOOL OF GRADUATE STUDIES, ADDIS ABABA UNIVERSITY, IN PARTIAL FULFILLMENT OF THE REQUIREMENT FOR THE DEGREE OF MASTERS OF SCEINCE IN ENVIRONMENTAL SCIENCE
URI: http://hdl.handle.net/123456789/112
Appears in:Thesis - Environmental Sciences

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