Discussion
Match each nitrogen fertiliser with its nitrogen content.
List I
A. Urea
B. Ammonium nitrate
C. Ammonium sulphate
D. Calcium ammonium nitrate
List II
1. about 21 per cent
2. about 46 per cent
3. about 26 per cent
4. about 34 per cent
Answer: A
Correct answer: A-2, B-4, C-1, D-3
The nitrogen contents follow from the formulae. Urea, \( \mathrm{CO(NH_2)_2} \), is 46 per cent nitrogen - the highest of any solid fertiliser, which is why it dominates world trade. Ammonium nitrate is 34, ammonium sulphate 21, and calcium ammonium nitrate 26, being ammonium nitrate diluted with limestone to make it safer to store and handle.
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