Regular use of which of the following fertilizers increases the acidity of soil ?

Potassium nitrate

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Urea

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Superphosphate of lime

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Ammonium sulphate

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Solution

The correct option is D Ammonium sulphate
Regular use of ammonium sulphate increases the acidity of soil.
The hydrolusis of ammonium sulphate produces sulphuric acid which increases the acidity of soil.
$(N H_{4})_{2} S O_{4} + 2 H_{2} O \to 2 N H_{3} + 2 H_{2} O + H_{2} S O_{4}$
To prevent acidity, slaked lime is added to neutralize the acid.

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