Potassium availability is low in light soil or after intense rainfalls by eluviation. On soils with high mineral content, potassium can become fixed and therefore unavailable to the crop.
Symptoms of potassium deficiency
Potassium deficiency is shown by necrosis on the apex of the leaf and the leaf-edges, in particular on the oldest leaves. In cereals the resistance to lodging and against diseases decrease. The red colour of fruits gets less intense.
What is potassium important for?
- Activation of enzymes and coenzymes
- Protein, photo- & carbohydrate synthesis
- Energy metabolism
- Stoma opening function, turgor pressure
- The transport of carbohydrates and proteins
- Resistance to dryness, frost and stress
Whereby potassium deficiency is enhanced?
- Acidic soil (low pH value)
- Sandy or light soil (leaching)
- Heavy rain (leaching) or excessive irrigation
- Heavy, potassium-fixing clay soil
- Soil with a low potassium reserve
- Soil with a high magnesium content