Fertiliser Technology
Low grade phosphate rock can be used in electrical furnace, because

It produces low cost product
CaO content is less
It is cheap
Of the better CaO/SiO₂ balance for slag formation

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Fertiliser Technology
Phosphatic fertilisers

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

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