Excerpt from Fertilizer Guide for the West Indies
We here have first ammonia 5 per cent. What is ammonia? It is a chemical combination of the elements nitrogen and hydrogen, of which nitrogen alone is of interest to the planter, as hydrogen is not a plant food that needs to be applied, we are therefore not interested in ammonia but in nitrogen.
Next we have nitrogen per cent, which is the same thing stated over again, as 5 per cent ammonia is equal to per cent nitrogen and it means that there are pounds of pure nitrogen in every 100 pounds of the fertilizer or per pounds, or pounds per ton.
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