Which one of the following will perform very poor as a source of N fertilizer under waterlogged rice field

Answer: Option A

Ammonium nitrate will perform very poorly as a source of N fertilizer under a water-logged rice field. Ammonium nitrate is a popular fertilizer with 34% of nitrogen.
The most suitable Nitrogenous fertilizer for submerged Rice fields is ammonium sulphate. It has 21% of N content.