K deficiency in Hibiscus

K deficiency in Hibiscus

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Scientific Name
Potassium (K)
Atomic Number
19
Atomic Weight u
39.098
Elemental Group
Macro elements (N, P, K ) | Primary macronutrients
Available Forms

Available forms of Potassium (K) for use in Container Nursery Stock

  • Potassium chloride (KCl, “Muriate of potash”) – highly soluble, commonly used in fertigation and substrate application.
  • Potassium sulfate (K₂SO₄, “Sulfate of potash”) – provides both K and S; less chloride, suitable for sensitive plants.
  • Potassium nitrate (KNO₃) – supplies both K and N; highly soluble, ideal for foliar or substrate application.
  • Potassium carbonate (K₂CO₃, “Pearlash”) – fast-acting, less commonly used in horticulture, can adjust substrate pH.
  • Potassium phosphate (K₃PO₄) – supplies K and P; highly soluble, often used in liquid fertilization.
  • Potassium hydroxide (KOH, “Caustic potash”) – soluble, mainly used in controlled fertigation to adjust K and pH.
  • Potassium-magnesium sulfate (K₂SO₄·2MgSO₄·6H₂O, “Langbeinite”) – provides K, Mg, and S; slow to moderate release in substrate.
  • Potassium silicate (K₂SiO₃) – soluble, provides K and silicon for stress tolerance; used mainly in foliar sprays.

Potassium (K) Deficiency in Hibiscus – Container Nursery Stock

Symptoms

  • Marginal leaf scorching or browning, often starting on older leaves.
  • Leaf curling or cupping along the edges.
  • Reduced plant vigor and stunted growth.
  • Flowers may be smaller, fewer, or of poor quality.
  • Increased susceptibility to pests and diseases.

Causes

  • Insufficient potassium in the growing medium or irrigation water.
  • High leaching in container substrates, particularly with sandy or soilless mixes.
  • Excessive nitrogen or other nutrients causing imbalances.
  • pH extremes reducing K availability.

Correction

  • Apply potassium fertilizers via substrate drench or fertigation (e.g., potassium sulfate, potassium nitrate).
  • Use foliar sprays of soluble K fertilizers for rapid symptom relief.
  • Adjust irrigation to reduce nutrient leaching.

Prevention

  • Maintain balanced fertilization programs with adequate K levels.
  • Monitor substrate nutrient status regularly.
  • Use slow-release K fertilizers in container media for sustained availability.
  • Avoid excessive nitrogen fertilization that can induce K deficiency.

K deficiency in Hibiscus

Potassium (K)
Scientific Name
Potassium (K)
Atomic Number
19
Atomic Weight u
39.098
Elemental Group
Macro elements (N, P, K ) | Primary macronutrients
Available Forms

Available forms of Potassium (K) for use in Container Nursery Stock

  • Potassium chloride (KCl, “Muriate of potash”) – highly soluble, commonly used in fertigation and substrate application.
  • Potassium sulfate (K₂SO₄, “Sulfate of potash”) – provides both K and S; less chloride, suitable for sensitive plants.
  • Potassium nitrate (KNO₃) – supplies both K and N; highly soluble, ideal for foliar or substrate application.
  • Potassium carbonate (K₂CO₃, “Pearlash”) – fast-acting, less commonly used in horticulture, can adjust substrate pH.
  • Potassium phosphate (K₃PO₄) – supplies K and P; highly soluble, often used in liquid fertilization.
  • Potassium hydroxide (KOH, “Caustic potash”) – soluble, mainly used in controlled fertigation to adjust K and pH.
  • Potassium-magnesium sulfate (K₂SO₄·2MgSO₄·6H₂O, “Langbeinite”) – provides K, Mg, and S; slow to moderate release in substrate.
  • Potassium silicate (K₂SiO₃) – soluble, provides K and silicon for stress tolerance; used mainly in foliar sprays.
K deficiency in Hibiscus
Image Source: PPO Boskoop (NL), care of ICL

Potassium (K) Deficiency in Hibiscus – Container Nursery Stock

Symptoms

  • Marginal leaf scorching or browning, often starting on older leaves.
  • Leaf curling or cupping along the edges.
  • Reduced plant vigor and stunted growth.
  • Flowers may be smaller, fewer, or of poor quality.
  • Increased susceptibility to pests and diseases.

Causes

  • Insufficient potassium in the growing medium or irrigation water.
  • High leaching in container substrates, particularly with sandy or soilless mixes.
  • Excessive nitrogen or other nutrients causing imbalances.
  • pH extremes reducing K availability.

Correction

  • Apply potassium fertilizers via substrate drench or fertigation (e.g., potassium sulfate, potassium nitrate).
  • Use foliar sprays of soluble K fertilizers for rapid symptom relief.
  • Adjust irrigation to reduce nutrient leaching.

Prevention

  • Maintain balanced fertilization programs with adequate K levels.
  • Monitor substrate nutrient status regularly.
  • Use slow-release K fertilizers in container media for sustained availability.
  • Avoid excessive nitrogen fertilization that can induce K deficiency.