Bicarbonate (HCO₃⁻)

Role in plants

Bicarbonate is not a nutrient. It affects plants indirectly by altering pH, nutrient availability, and root function.

Stress effects

• Induced iron, manganese, and zinc deficiency
• Rising substrate pH
• Reduced root function
• Carbonate precipitation with calcium and magnesium

Sources

• Hard irrigation water
• Limestone aquifers
• Dissolved CO₂ equilibria

Agronomic significance

Bicarbonate is a primary driver of many “mystery” micronutrient problems and must be managed via acidification and water treatment.

Interaction form

• HCO₃⁻