A germination test was carried out to identify plants that can germinate and survive in polluted soil (with and without ash) collected 2.5km east and 2.5km west, 20km west and 55km west (control) of the BCL Cu/Ni mine smelter in Selebi-Phikwe, Botswana. The experiment was carried out using Phaseolus vulgaris, Moringa oleifera and Moringa stenopetala. Soil acidity and heavy metal stress reduced germination percentage, coefficient rate of germination, root and shoot growth and dry weight, root: shoot, vigour index and tolerance index of all species. Percentage reduction followed the order 2.5km west < 20km west < 2.5km east < 55km west. Phaseolus vulgaris, Moringa oleifera and Moringa stenopetala germinated in all soils. Their ability to germinate in polluted soil indicates tolerance to heavy metal and soil acidity stress and so they have potential for use in phytoremediation of polluted soils around the mine. Phaseolus vulgaris had the highest overall germination performance but there was no significant difference between the Moringas. Application of coal fly ash increased all the germination parameters and so coal fly ash has potential for use in amending polluted soil around the mine for phytoremediation purposes.
Full text at Int. J. Agron. Agri. Res. 20(3), 1-9, March 2022.
Submit your paper to the International Journal of Agronomy and Agricultural Research