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Journal of the Department of Agriculture, Western Australia, Series 4
Compound fertilizers, Nitrogen-phosphorus fertilizers
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Nitrogen and phosphorus are two vitally important elements for plant growth which are deficient in most soils throughout Western Australia's agricultural areas.
Both nitrogen and phosphorus can also be applied in appropriate compound fertilisers which can be drilled with the seed, thus making their handling much easier. However, excessively high rates can depress plant emergence and may lower crop yields.
Mason, M G. and Bowden, J. W.
"Nitrogen and phosphorus compound fertilisers,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 26:
1, Article 8.
Available at: https://library.dpird.wa.gov.au/journal_agriculture4/vol26/iss1/8