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ALTHOUGH 'double' or 'concentrated' superphosphate was first commercially manufactured in 1872 it was not until the 1950's that it became a major commercial fertiliser. In 1965 it accounted for about 15 per cent, of the world production of phosphatic fertilisers.
Cox, Walter Jacob
"The phosphorus fertilisers : how they compare,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 9:
9, Article 7.
Available at: https://library.dpird.wa.gov.au/journal_agriculture4/vol9/iss9/7