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FERTILISER TECHNOLOGY

Fertiliser Technology
5-10-5 fertilisers mean that they contain

5 to 10% filler & carrier of soil conditioners
None of these
Only 5 to 10% active fertiliser constituents
5, 10, 5% respectively of N₂, P₂O₅ and K₂O

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Fertiliser Technology
Maximum nitrogen percentage is in

Urea
Liquid ammonia
Calcium ammonium nitrate
Ammonium sulphate

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Fertiliser Technology
Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N₂ & H₂ is high. The presence of promoter along with the catalyst helps in __________ of the catalyst.

Improving the strength & heat resistance
All of these
Stabilisation
Increasing the effectiveness

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

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

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Fertiliser Technology
Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the

Presence of a reducing atmosphere
Presence of an inert atmosphere
Absence of air
Presence of an oxidising atmosphere

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