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
Plant tranquillisers

Cause early maturation of plants
Produce seedless fruit
Hold back stem growth and halt plants at a desired height
Accelerate ripening of food and grain

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