Approximately 1 kg each of the sieved and
preincubated soil samples were distributed into eight
7cm diameter plastic pots labeled A – H. Solutions of
analytical grade (Sigma) Sulphate (SO4
2-) salts each of
zinc (Zn), copper (Cu) and nickel (Ni) dissolved in
200 mL of distilled water were applied to the respective
pots singly and in combinations (Table 2)