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Depends on the formulation of the fertilizer in question.

Generally the most commonly produced fertiliser blends are "NPK" type fertilisers.

These contain the three main "macro-nutrients" that plants require for growth - namely Nitrogen (N), Phosphate (P) and Potassium (K) - the NPK notation is the chemical element as per the Periodic Table.

The amount or ratio of NP and K varies according to the formulation that is manufactured and according to the purpose of the fertiliser.

Nitrogen - encourages green shoot formation

Phosphates - aid in the establishment of a good root system

Potassium - is used in flower and fruit formation

For example a fertiliser NPK 10-10-10 can be produced, this has equal parts NPK and can be considered a "balanced fertiliser", another formulation such as NPK 3-1-5 is designed to promote shoot (green) growth and flowering and fruiting - and only offers a small percentage of Phosphate for root development.

Advanced formula of chemical fertilisers can also contain Trace Elements (normally denoted by +TE after the NPK on the packaging). These provide the equally necessary micro-elements for growth (Copper, Boron, Manganese etc.) but in much smaller quantities than the NPK portion.

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