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

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

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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

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

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Fertiliser Technology
Potassic fertilisers

Stimulate early growth and accelerate seeding
Help in development of starches of potatoes and grain
Are useful during early stage of the plant growth
None of these

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