Tea is a perennial plantation crop that depends on a strong and healthy root system for continuous nutrient uptake and regular leaf production. One of the most important nutrients responsible for root growth is phosphorus (P). Although most agricultural soils contain phosphorus, nearly 70–90% of it remains locked in insoluble forms, making it unavailable to tea plants.

Applying additional chemical phosphorus fertilizers does not always solve the problem because much of the applied phosphorus also becomes fixed in the soil. This leads to poor fertilizer efficiency, increased production costs, and nutrient wastage.

Phosphate Solubilizing Bacteria (PSB) are beneficial soil microorganisms that naturally convert insoluble phosphorus into plant-available forms. By unlocking this fixed phosphorus, PSB improves root development, nutrient uptake, and overall tea plant health, resulting in better leaf production and higher yields.

What is PSB?

Phosphate Solubilizing Bacteria (PSB) are beneficial microorganisms that release organic acids and enzymes capable of dissolving insoluble phosphate compounds present in the soil.

Instead of adding more phosphorus, PSB helps tea plants utilize the phosphorus already available in the soil, improving fertilizer efficiency and reducing nutrient losses.

Why Tea Farmers Should Use PSB

Healthy tea bushes require continuous root growth throughout their productive life. Strong roots absorb more nutrients, more water, and support regular flushing of new tea leaves.

Benefits of PSB

• Unlocks fixed soil phosphorus
• Promotes vigorous root growth
• Improves nutrient absorption
• Encourages healthy shoot development
• Enhances fertilizer efficiency
• Improves soil biological activity
• Reduces phosphorus fertilizer requirement
• Supports sustainable tea farming
• Increases leaf production
• Improves long-term plantation productivity

How PSB Works in Tea Plantation

After application, PSB colonizes the root zone and begins converting insoluble phosphorus into soluble forms that tea roots can absorb.

Phosphorus Solubilization

Organic acids released by PSB dissolve fixed phosphorus compounds present in the soil.

Better Root Growth

Adequate phosphorus stimulates new root formation and encourages extensive root branching.

Improved Nutrient Uptake

A healthy root system absorbs nitrogen, potassium, micronutrients, and water more efficiently.

Improved Soil Biology

PSB increases beneficial microbial activity, creating a healthier rhizosphere.

Higher Fertilizer Efficiency

Plants utilize applied phosphorus fertilizers more effectively, reducing nutrient wastage.

Application Methods

Soil Application

Mix PSB powder with well-decomposed compost or farmyard manure and apply around the root zone.

Drip Irrigation

Liquid PSB can be applied through drip irrigation for even distribution around the roots.

Root Zone Drenching

Apply liquid PSB near the root zone during periods of active growth for rapid microbial establishment.