Ammonium nitrate (NH₄NO₃) is not suitable for use in paddy rice fields because these fields remain waterlogged and oxygen-deficient (anaerobic conditions). In such environments, the nitrate (NO₃⁻) part of the fertilizer is easily lost through denitrification, where soil bacteria convert nitrate into nitrogen gases (N₂, N₂O), leading to a significant loss of usable nitrogen. This makes the fertilizer inefficient for flooded soils like rice paddies.
The fertilizer which cannot be used in paddy rice field:
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