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0.05 No No Wilting All Burning Plant dead

chang chang is petiole s appearanc
e e started are bend e

downwar

d
Brassica nigra

0.01g No No No No Wilting of Wilting Plant dead
chang chang change change seedling

e e

0.05g No No No No Wilting of Wilting Plant dead
chang chang change change seedling

e e

Wedelia trilobata,Moringa oleifera , Brassica nigra was exposed to different concentrations

of HgCl2, FeCl3 with a view to observe their phytoremediation activities, and gave promising
results.

In HgCl2, Moringa oleifera showed best result and the stem cutting survived for about 72hrs,
when grown in solution of concentration of 0.01%, but it started wilting after 30hr. Wedelia

trilobata showed best result and it survived for about 120hrs in FeCl3 when grown in lower
concentration of 0.01%, and showed wilting after 48hrs and it completely dried after 120

hours.

4.3.3 Effect of pH changes on different plant species
The term pH is used to express the acidity or alkalinity of the soil. The pH is important

because it affects the availability of nutrients in the soil that are essential for plant growth.
The availability of most nutrients of best at pH of 6.2-6.8. when the pH is higher ,

micronutrients such as iron (Fe), manganese (Mn), boron (B),copper (Cu) and zinc( Zn)

become less available . This is because soil pH affects the solubility of plant nutrients in the
soil, some of them becoming more soluble as pH increases , others as the pH decreases.

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