Q. Arrange the following fertilizers according to the decreasing order of their nitrogen content
I. Ammonium sulphate
II. Ammonium nitrate
III. Potassium nitrate
IV. Urea
Answer: IV, II, I, III
Notes: Urea contains the highest percentage of nitrogen. Ammonium sulphate contains 21% nitrogen. Ammonium nitrate is an important fertilizer with 34% nitrogen. Potassium nitrate contains 13 % nitrogen.