In certain rice-growing regions, farmers combine paddy fields with a fish farm. The paddy fields remain flooded for most of the growing period, and water leaving the fields passes through pens in which fish are reared. Nitrogen-based fertilizers are usually highly soluble in water. Which problems could happen if farmers add too much nitrogen-based fertilizer to their paddy fields?
- A1, 2 and 3 are correct
- B1 and 2 only are correct
- C2 and 3 only are correct
- D1 only is correct