Bacillus subtilis PSB

Bacillus subtilis phosphorus-solubilizing biofertilizer that converts insoluble soil phosphorus into plant-available orthophosphate. Produces organic acids (citric, oxalic, gluconic) that dissolve rock phosphate and calcium phosphate complexes locked in the soil. Can increase P availability by 20-30%, reducing DAP/TSP requirements. Also exhibits biocontrol properties against Fusarium, Rhizoctonia, and Pythium root pathogens.

Ships within 3-5 business days

Sample available

ISO 9001 certified quality

24h customer support

Specifications

OrganismBacillus subtilis

CFU Count≥2×10⁹ CFU/g

FormWettable powder

P Solubilization+20-30%

Packaging1kg / 5kg / 25kg

Wholesale Pricing

We offer our best per-ton rates on bulk orders. Request a custom quote and our team will reply within 24 hours with pricing tailored to your volume and destination.

Minimum order1 ton

Desired tonnage

Categories: Fertilizers, Microbial Biofertilizers & Inoculants

Description
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ISO 9001:2015

REACH Compliant

EU Fertilizer Reg.

GMP Certified

Product Overview

Bacillus subtilis PSB (Phosphorus-Solubilizing Bacteria) biofertilizer unlocks soil-bound phosphorus that conventional fertilizers cannot access. Up to 75% of applied phosphate fertilizer becomes fixed in soil within weeks — locked as insoluble calcium, iron, and aluminum phosphates unavailable to crops. Our B. subtilis PSB product solubilizes these fixed phosphorus reserves through organic acid production, increasing plant-available P by 20-30% and reducing DAP/TSP requirements. As a bonus, B. subtilis exhibits potent biocontrol activity against Fusarium, Rhizoctonia, and Pythium root pathogens.

How Bacillus subtilis PSB Works

Bacillus subtilis produces organic acids (citric, oxalic, gluconic, succinic) that dissolve insoluble phosphate minerals in soil. The acids lower rhizosphere pH and chelate calcium, iron, and aluminum ions — releasing orthophosphate (H₂PO₄⁻) into the soil solution for plant uptake. Additionally, B. subtilis produces phosphatase enzymes that mineralize organic phosphorus from soil organic matter and crop residues. The biocontrol mechanism involves production of lipopeptide antibiotics (surfactin, iturin) and competition for root colonization sites.

Key Benefits

Unlocks 20-30% more phosphorus from fixed soil reserves

Reduces DAP/TSP requirements by 25-30%

Dual function: P-solubilization + biocontrol against root pathogens

Produces surfactin and iturin lipopeptide antibiotics

Spore-forming — excellent shelf stability (24+ months)

Heat and drought tolerant endospores survive harsh conditions

Compatible with organic and conventional farming systems

≥2×10⁹ CFU/g guaranteed potency

Application Guide

Seed treatment: apply 5-10g wettable powder per kg seed with sticker. Soil application: apply 2-5 kg/ha in-furrow or broadcast with incorporation. Fertigation: dissolve 1-2 kg/ha in irrigation water. For maximum P solubilization, ensure soil organic carbon >0.5% (the bacteria need carbon as an energy source). Apply at planting for early root colonization. Compatible with phosphate fertilizer — use BOTH for immediate + biological P supply.

Ideal For

All cropsP-deficient soilsCalcareous/alkaline soilsOrganic farmingHigh-P-fixation soilsVegetablesFruit treesCereals

Storage & Handling

Bacillus subtilis forms durable endospores resistant to heat, desiccation, and UV. Store at ambient temperature (<30°C) in sealed packaging. Shelf life: 24 months. No refrigeration required. Wettable powder form is easy to handle and apply.

Why Choose Dongkwang Poland?

Dongkwang Poland’s B. subtilis PSB contains verified phosphate-solubilizing strains with documented organic acid production profiles. Spore concentration is guaranteed at ≥2×10⁹ CFU/g with quality verification on every batch.