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

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

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Fertiliser Technology
Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature

None of these
Very high pressure is required resulting in costly pressure vessel
Space velocity of gas is very low resulting in decreased conversion
Rate of reaction is very low

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