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

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

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Fertiliser Technology
Phosphatic fertilisers

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

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