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

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

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Fertiliser Technology
Potassic fertilisers

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

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