Biology · Mineral Nutrition
A paddy field is continuously flooded for several weeks. Soil analysis shows a sharp decline in nitrate concentration despite sufficient nitrogen input through fertilizers. Which explanation best accounts for this observation?
- 1Inhibition of ammonification due to excess soil moisture
- 2Activation of anaerobic denitrifying bacteria utilizing NO3- as terminal electron acceptor✓
- 3Enhanced uptake of nitrates by submerged rice roots leading to depletion
- 4Increased activity of aerobic nitrifying bacteria converting NH4+ to NO3-
Correct answer
Activation of anaerobic denitrifying bacteria utilizing NO3- as terminal electron acceptor
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