Bluelab Soil pH Pen Manual do Utilizador descarregar pdf (Página 7)

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6.0 Information about measuring the pH of soils/media

pH is the measurement of the hydrogen ion concentration (H+) - acidity and its

opposite, alkalinity. Neutral pH is 7.0 pH. Acidity measures below seven pH (7.0 pH)

with alkalinity measuring above it (7.0 pH). See chart below.

In soils or growing media, pH strongly inﬂ uences the availability of nutrients and the

presence of microorganisms in the soil.

Certain plants require a particular pH range to enable the required nutrients to be consistently available

to the plant. If the solution is too acidic or too alkaline it can cause “lock up” – a situation which restricts

certain elements essential for growth from being absorbed by the root structure. This in turn reduces plant

health and performance. Deﬁ ciencies in the required elements become apparent in plant growth and can

lead to crop failure.

Low soil pH causes aluminium and manganese toxicity in plants and reduces the availability of soil

phosphorus. High soil pH also reduces soil phosphorus availability and reduces micro nutrients

such as zinc and boron to plants.

The chart below shows how nutrient pH levels inﬂ uence the uptake of certain elements.

Recommended pH range

for plants grown in:

can be plant speciﬁ c

Solution

Soil

5.5 - 6.3

6.2 - 7.2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

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Bluelab Soil pH Pen Manual do Utilizador Página 7