Question

The pH of soil A is 7.5 while that of soil B is 4.5. Which of the two soils, A or B, should be treated with powdered chalk to adjust its pH and why?

Answer 1

Soil B, with a pH of 4.5, is very acidic and is thus not suitable for the normal growth of plants. Therefore, to reduce its acidity, soil B should be treated with powdered chalk (CaCO₃), which is a base.