Which of the following fertilizers show maximum residual acidity with the continuous soil application:
Correct answer: B. Ammonium sulphate
- A. Urea
- B. Ammonium sulphate
- C. Ammonium nitrate
- D. Calcium ammonium nitrate
Explanation
Ammonium sulphate produces the greatest residual acidity because nitrification of its ammonium releases acidity, while its sulphate component does not offset this effect. Urea and ammonium nitrate are also acid-forming, but generally less strongly under continuous use.
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