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

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

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Fertiliser Technology
Excessive use of chemical fertilisers causes shrivelling of the roots and wilting of the plant, because the

Osmotic pressure of the soil water becomes less than that of the plant sap
Soil becomes too acidic
Soil becomes too alkaline
Osmotic pressure of the soil water becomes higher than that of the plant sap

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