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

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

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Fertiliser Technology
Potassic fertilisers

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

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