Fertiliser Technology
Ammonium nitrate (is mixed with limestone) is not used as fertiliser as such, because

It is a liquid at room temperature
Its nitrogen content is very less
It is hygroscopic and explosive in nature
It is highly acidic in nature

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Fertiliser Technology
The composition of fresh feed to the high temperature, high pressure urea autoclave is

Excess liquid ammonia and liquefied CO₂
Excess liquid ammonia and compressed CO₂ gas
Compressed ammonia gas and excess compressed CO₂
Liquid ammonia and excess compressed CO₂

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