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

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

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Fertiliser Technology
Phosphatic fertilisers

Are useful during early stage of the plant growth
Lessen the effect of excessive nitrogen application
Accelerate fruit formation in later stages of growth
None of these

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