Practice mode Soil Science

Ammonium sulphate, containing 21% N and 24% S, is best used as a top dressing for which crop?

Correct answer A. Rice

Explanation

Ammonium nitrogen is not easily lost by denitrification in flooded soil, and rice also benefits from the sulphur, so ammonium sulphate suits top dressing paddy fields.

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Answer checked 11 October 2026 How we write and check questions

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Ammonium sulphate, containing 21% N and 24% S, is best used as a top dressing for which crop?

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Ammonium sulphate, containing 21% N and 24% S, is best used as a top dressing for which crop?

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