Fertiliser Technology
Urea is a better fertilizer than ammonium sulphate, because

Nitrogen content is higher
It is cheaper
It is easy to manufacture
It is not poisonous

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

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