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Journal of the Department of Agriculture, Western Australia, Series 4
Trace element fertilizers, Application rates, Western Australia
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T H E term "minor elements" which is now commonly used and well understood by farmers and gardeners, refers to the five essential plant foods—copper, zinc, manganese, molybdenum and boron.
These five essential plant foods are needed by all plants in minute quantities and it is relatively easy to use them in excess of actual requirements or even in toxic amounts.
In practice this is not usually a problem with cereals and pastures. The important exception is when zinc alone is added to a cereal crop low in copper and the extra zinc accentuates the copper deficiency, and poorer yields are obtained.
Jones, L T.
"Minor elements can be overdone,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 2:
2, Article 13.
Available at: https://library.dpird.wa.gov.au/journal_agriculture4/vol2/iss2/13