Biological Organic Fertilizer – Composition, Benefits, and Application Data

Biological Organic Fertilizer – Composition, Benefits, and Application Data

Introduction

Biological organic fertilizer combines organic matter (e.g., compost, manure, or plant residues) with specific beneficial microorganisms. Unlike conventional synthetic fertilizers, biological organic fertilizers improve soil structure and provide nutrients through microbial activity. Hebei Wangdalei Trading Co., LTD supplies biological organic fertilizer products sourced from certified processing facilities. This article describes the composition, quality parameters, application rates, and field performance data for biological organic fertilizer.

Definition and Key Components

Biological organic fertilizer is defined in Chinese standard NY/T 525‑2021 as a fertilizer that contains organic carbon (≥12%) and viable microorganisms (≥0.2 billion/g), with total nutrients (N+P₂O₅+K₂O) ≥4%. The product is produced through aerobic fermentation and post‑inoculation of functional microbes.

Main components include:

• Organic matter – Derived from crop straw, animal manure (chicken, pig, cow), mushroom residue, or peat. Organic matter content typically ranges from 30% to 60% on a dry weight basis.

• Living microorganisms – Common strains: Bacillus subtilis, Bacillus licheniformis, Bacillus megaterium, Azotobacter, Rhizobium. Viable count ≥0.2 billion CFU/g (colony forming units per gram).

• Mineral nutrients – Nitrogen, phosphorus, and potassium from the raw materials or added as inorganic supplements. Total NPK ≥4% (often 4‑8%).

Production Process

A standard biological organic fertilizer manufacturing line includes:

1. Raw material pre‑treatment – Adjusting moisture to 55–65% and C/N ratio to 25:1–30:1.

2. Aerobic fermentation – Windrow or in‑vessel composting. Temperature is maintained at 55–65°C for 7–10 days to kill weed seeds and pathogens. Total fermentation time: 20–30 days.

3. Secondary aging – 15–30 days at ambient temperature to stabilize humus.

4. Inoculation – Spraying liquid microbial culture (1–2 L per ton) and mixing.

5. Drying and crushing – Reducing moisture to ≤20% and particle size to ≤2 mm.

6. Granulation (optional) – Using a disc or drum granulator. Granules are 2–4 mm in diameter.

7. Low‑temperature drying – Below 60°C to preserve microbial viability.

Data from 2023 production records show that properly manufactured biological organic fertilizer retains 70–80% of inoculated microbes after six months of storage in sealed bags at 25°C.

Quality Parameters and Test Methods

Biological organic fertilizer destined for export may also be tested for additional parameters such as chlorine content (<2%) and foreign matter (<0.5% by weight).

Nutrient Release Characteristics

Unlike soluble chemical fertilizers, biological organic fertilizer releases nutrients gradually. A controlled incubation study (30 days, 28°C, 60% water‑holding capacity) showed:

The addition of Bacillus strains increases phosphorus solubilization by 15–25% compared to sterile organic fertilizer, based on greenhouse trials.

Field Performance Data

A two‑year field trial (2022–2023) on tomato in Hebei Province compared three treatments:

• Treatment A: Biological organic fertilizer (2 tons/ha) + 50% chemical NPK

• Treatment B: 100% chemical NPK (based on soil test: 180N‑90P₂O₅‑150K₂O kg/ha)

• Treatment C: Untreated control

Results (averages of four replications):

Treatment A (combination) produced 12% higher yield than full chemical NPK, with improved soil health indicators.

Application Guidelines

Base application (pre‑planting) – Broadcast 1.5–3 tons per hectare for field crops, 3–6 tons per hectare for vegetables. Incorporate into top 15–20 cm of soil 7–10 days before planting.

Top dressing – For long‑duration crops (e.g., sweet corn, banana), apply 0.5–1 ton per hectare during active growth. Water immediately after application to move microbes into the root zone.

Compatibility – Biological organic fertilizer can be blended with most granular NPK products at ratios up to 1:1 (by weight). Avoid mixing with high‑chlorine fertilizers (>15% Cl) or copper/zinc fungicides before application, as these reduce microbial survival.

Storage – Store in a cool, dry place below 35°C. Keep bags sealed. Use within 12 months of production for guaranteed microbial count. Opened bags should be used within 30 days.

Quality Assurance for Export

Hebei Wangdalei Trading Co., LTD ensures that sourced biological organic fertilizer meets the following export specifications:

• Organic matter ≥40% (dry basis)

• Total NPK ≥5%

• Viable microbial count ≥0.5 × 10⁹ CFU/g (using Bacillus subtilis or Bacillus licheniformis)

• Moisture ≤15%

• Granule size (if granular) 2–4 mm, ≥85% passing

• Heavy metals below EU limits (EC 2019/1009)

• Salmonella: absent in 25 g; E. coli <100 CFU/g

Pre‑shipment inspection by a third party (SGS, Bureau Veritas) is available. Samples of 500 g are retained for 12 months.

Conclusion

Biological organic fertilizer provides a combination of organic matter and functional microbes that improve soil health and crop yield. When used alongside reduced chemical fertilizer rates, it can maintain or increase productivity while enhancing soil organic carbon. Hebei Wangdalei Trading Co., LTD supplies biological organic fertilizer with documented quality parameters and microbial viability data, suitable for conventional and transitional farming systems.