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FERTILISER TECHNOLOGY

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

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

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Fertiliser Technology
Maximum nitrogen percentage is in

Ammonium sulphate
Calcium ammonium nitrate
Liquid ammonia
Urea

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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.

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

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

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

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

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