One of the most crucial mineral components for grape growth is phosphorus, but because the amounts needed are so tiny, the supply from the soil is generally adequate in the majority of vineyards. One ton of grapes only contains roughly 0.6 kg (1.3 lb) of phosphorus.

In the vine, phosphorus is a crucial part of molecules involved in energy transfer, photosynthesis, and the conversion of sugar into starch.

The symptoms of phosphorus insufficiency include a progressive loss of vigor and, occasionally, some red sports on the leaves. It is uncommon and is mostly found on highly acidic soils, occasionally in hillside vineyards.

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