Fertiliser Technology
Liquid ammonia is not used as such a fertiliser in tropical countries like India, because

Its N₂ content is very low
It is very costly
It is not available
It will evaporate on spraying

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Fertiliser Technology
Multistage operation (as in the case of catalytic oxidation of SO₂) is not carried out for NH₃ synthesis, because of

Comparatively higher pressure drop
Chances of entrainment and disturbance of catalyst bed
High cost of the high pressure vessel used for the reactor
Higher pumping cost

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