Fertiliser Technology
Commercial production of hydrogen for the manufacture of nitrogeneous fertilisers is done by

All of these
Electrolysis of water
Steam reforming of naphtha and cracking of natural gas
Cryogenic separation of hydrogen from coke oven gas

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Fertiliser Technology
Potassic fertilisers

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

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