Hanna-instruments HI 83225 Bedienungsanleitung PDF herunterladen (Seite 18)

POTASSIUM

Potassium (K) is essential in proteic synthesis. The problem of lack of potassium is quite frequent in

calcareous soils.

Potassium is absorbed as K

PRESENT IN

tissues responsible for the growth of plants (primary and secondary meristems), embryos and cell

vacuole

ACTION

• improves the quality of fruits and flowers

• gives more resistance both to frost and to diseases caused by fungi (increases the cuticular thickness)

• regulates the cellular turgidity (helps to regulate the osmotic processes and increases the

resistance to dryness)

• regulates the stomatic opening and closing (it means a strong influence on transpiration and

photosynthesis)

SHORTAGE

• slower growth

EFFECTS

• smaller fruits, less colored and less preserved

• increase of transpiration

• less resistance to the cold

PHOSPHORUS

Phosphorus (P) has an important role in many fundamental biochemical and physiological processes. Plants

take up phosphorus in the form of phosphate ion (PO

¯).

PRESENT IN

DNA and RNA, ATP, ADP

ACTION

• stimulates the roots growth

• stimulates blooming

• stimulates fecundation and ripeness

• strengthens the plant tissues

• is necessary in the formation of seeds

SHORTAGE

• delayed ripening

EFFECTS

• slower growth

• small leaves

• decrease of production (smaller fruits and difficult seeds formation)

• reduction of root system

EXCESS EFFECTS

• premature ripening

• excess of fruit-setting

• negative effects on the absorption of some microelements such as iron, zinc, boron and copper

EXCESS EFFECTS

• reduced absorption of calcium and magnesium

• increase of water consumption

• increase of the substrate salinity

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