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Repeated use of which one of the following fertilizers would increase the acidity of the soil?

1. Urea
2. Superphosphate of lime
3. Ammonium sulphate
4. Potassium nitrate

Correct answer: Ammonium sulphate

Solution

Ammonium sulphate releases ammonium ions, which upon nitrification produce hydrogen ions, thereby increasing soil acidity.

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