Compound fertilizers, Nitrogen-phosphorus fertilizers
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FARMERS were able to buy the two compound fertilisers N-P Compound Fertiliser 28:14 and N-P Compound Fertilser 24:24 in the 1967 season.
Mason, M G.; Cox, W. J.; and Glencross, R. N.
"N-P compound fertilisers,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 9
, Article 6.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture4/vol9/iss9/6