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oxide is required, and equivalents is required

Oxide equivalents or elements?

A fertiliser bag labelled 20–20–20 and cards showing 20% P₂O₅ converted to 8.72% P and 20% K₂O converted to 16.60% K.
in the bag. Image: RBHMMX · CC BY 4.0. On fertiliser labels, these figures are conventionally reported as oxides, or oxide equivalents. They describe quantities; they do not necessarily tell you which compounds are actually in the fertiliser. So...
14 October 2026

Plantan in English

These guides bring Plantan’s Icelandic articles and first-hand growing experience to English-speaking readers. Oxide equivalents or elements? Growing media: what should surround the roots? Plant nutrition Lighting pH (acidity) What is good to grow...
14 October 2026

Plant nutrition

Scales, measuring cylinders and fertiliser in powder, granule and liquid forms on a sunlit greenhouse workbench.
(EC) Hydroponics Originally published: 8 February 2023 · Last substantively reviewed: 9 October 2026 See also: Oxide equivalents or elements?. Translated from Icelandic with AI assistance. Read the Icelandic original. Links to untranslated articles open...
14 October 2026

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