Question on: JAMB Biology - 1990

To improve an acidic soil, you need to raise its pH, making it less acidic. This is typically done by adding a substance that neutralizes the acid. None of the options provided would achieve this.

• Sedimentation: This is the process of particles settling out of a suspension. It doesn't change the soil's acidity.
• Leaching: This is the process where water dissolves and carries away soluble substances from the soil. This can actually make the soil more acidic by removing bases.
• Flocculation: This is the process where small particles clump together. This doesn't affect the soil's acidity.
• Watering: Watering can sometimes help, but in many cases watering can actually exacerbate the acidity of the soil by speeding up leaching

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