Which type of nitrogen-containing fertilizers is unsuitable for use in waterlogged or flooded soils?

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Fertilizers containing ammoniumFertilizers with nitrate nitrogenFertilizers combining ammonium and nitrate formsBoth nitrate and ammonium-nitrate fertilizersNone of the above

Explanation

Nitrate-based and ammonium-nitrate fertilizers are not recommended for flooded soils because the anaerobic conditions can cause nitrogen loss through denitrification and reduce fertilizer efficiency. Ammonium fertilizers are more stable under such conditions, making them preferable for use in waterlogged fields.