Biological Organic Fertilizer Composition Application And Soil Health Benefits

Introduction

Biological organic fertilizer combines organic matter with beneficial microorganisms to improve soil health and supply plant nutrients. Unlike conventional NPK compound fertilizers, biological organic fertilizers provide slow‑release nutrition and enhance soil biological activity. Hebei Wangdalei Trading Co., LTD supplies biological organic fertilizer products suitable for sustainable agriculture. This article describes the composition, manufacturing process, application rates, and soil improvement data for biological organic fertilizers.

Definition and Composition

Biological organic fertilizer is defined as a fertilizer containing organic carbon and viable microorganisms. Standard specifications require:

Organic matter content: minimum 40 percent on a dry weight basis

Viable microbial count: minimum 20 million colony forming units per gram

Moisture content: below 30 percent

pH range: 5.5 to 8.0

Heavy metal content: below regulated limits for cadmium, lead, mercury, and arsenic

The organic component typically comes from plant residues, animal manure, peat, or processed agricultural waste. The microbial component includes bacteria such as Bacillus subtilis, Bacillus licheniformis, Lactobacillus species, and nitrogen‑fixing bacteria such as Azotobacter and Rhizobium.

Manufacturing Process

Biological organic fertilizer production involves two main stages: composting and inoculation.

Composting stage. Raw organic materials are mixed with bulking agents such as rice husks or sawdust to achieve a carbon to nitrogen ratio between 25 to 1 and 30 to 1. The mixture is stacked in windrows and turned regularly. Composting temperature reaches 55 to 65 degrees Celsius for at least 7 days to kill pathogens and weed seeds. The active composting period lasts 20 to 40 days, followed by a curing period of 30 to 60 days.

Inoculation stage. After composting, the material is cooled to below 40 degrees Celsius. Beneficial microorganisms are added as a liquid or powder inoculant. The inoculated material is mixed thoroughly and then dried to below 30 percent moisture. Some products are pelletized or granulated for easier handling.

Quality control tests during production include:

Organic matter content by loss on ignition

Microbial count by plate counting method

Moisture content by oven drying

pH measurement

Pathogen testing for Salmonella and E. coli

Types of Biological Organic Fertilizer

General purpose biological organic fertilizer. Contains a mixture of decomposer bacteria and nutrient‑releasing microorganisms. Suitable for most field crops and vegetables. Typical application rate is 1,000 to 3,000 kg per hectare.

Nitrogen‑fixing biological organic fertilizer. Enriched with Azotobacter or Rhizobium. Provides biological nitrogen fixation. For legume crops, this product can reduce synthetic nitrogen requirement by 30 to 50 percent. Application rate is 500 to 1,500 kg per hectare.

Phosphate‑solubilizing biological organic fertilizer. Contains bacteria such as Pseudomonas or Bacillus that convert insoluble phosphorus into plant‑available forms. Application rate is 1,000 to 2,000 kg per hectare.

Combination products. Contain both organic matter and low rates of chemical NPK, typically 5 to 10 percent NPK. These products provide immediate nutrient availability from the chemical component and slow‑release nutrition from the organic component.

Benefits for Soil Health

Field studies have measured the effects of biological organic fertilizer on soil properties. A three‑year trial on vegetable fields in Shandong Province compared biological organic fertilizer applied at 2,000 kg per hectare against a control with no organic amendment.

After three years, the biological organic fertilizer treatment showed:

Soil organic matter increased from 1.2 percent to 1.8 percent

Soil bulk density decreased from 1.45 to 1.32 grams per cubic centimeter

Water holding capacity increased by 15 percent

Microbial biomass carbon increased by 60 percent

Soil pH remained stable while the control showed a slight decline

The treated soil also showed higher populations of beneficial bacteria and lower incidence of Fusarium wilt in tomato crops.

Application Rates for Different Crops

Recommended application rates for biological organic fertilizer vary by crop type and soil condition.

For vegetables such as tomato, cabbage, and pepper:

Base application: 1,500 to 2,500 kg per hectare incorporated into soil before planting

Side dressing: 500 to 1,000 kg per hectare at flowering stage

For field crops such as maize, wheat, and rice:

Base application: 1,000 to 2,000 kg per hectare before seeding

No additional application needed for short‑season crops

For fruit trees such as apple, citrus, and grape:

Base application: 3 to 5 kg per tree for young trees, 8 to 12 kg per tree for mature trees

Applied in a ring around the drip line and incorporated into the top 15 centimeters of soil

For high‑value cash crops such as tobacco and tea:

Base application: 2,000 to 4,000 kg per hectare

Additional application of 1,000 kg per hectare after harvest

Combining Biological Organic Fertilizer with NPK

Biological organic fertilizer is often used together with NPK compound fertilizer. The organic component improves soil structure and provides slow‑release nutrients. The NPK component supplies immediately available nutrients for early crop growth.

A typical combination strategy for maize:

Apply 1,500 kg per hectare of biological organic fertilizer as base

Apply 200 kg per hectare of NPK 15-15-15 at planting

Apply 100 kg per hectare of urea at the V6 growth stage

This combination reduces total synthetic NPK application by 20 to 30 percent while maintaining or increasing yield compared to synthetic NPK alone. A trial on maize in Hebei province showed that the combination treatment produced 8.7 tons per hectare compared to 8.4 tons per hectare with full synthetic NPK alone. The combination also reduced nitrogen leaching by 25 percent.

Storage and Handling

Biological organic fertilizer contains living microorganisms and requires careful storage. Storage recommendations include:

Store in a cool, dry location away from direct sunlight

Keep temperature below 35 degrees Celsius

Do not store for more than 12 months because microbial counts decline over time

Keep bags sealed until use to prevent moisture absorption

Do not mix with strong chemical fertilizers or pesticides before storage because these can kill microorganisms

Shelf life testing shows that microbial counts decline by 10 to 20 percent after 6 months of storage under cool, dry conditions. Products stored in hot, humid conditions lose 30 to 50 percent of microbial count within 6 months.

Quality Specifications for Export

For international trade, biological organic fertilizer should meet the following specifications:

Organic matter: minimum 40 percent

Total NPK content: typically 4 to 8 percent (if it is an organo‑mineral fertilizer)

Viable microbial count: minimum 20 million colony forming units per gram

Moisture: maximum 30 percent

Heavy metals: cadmium below 3 mg per kg, lead below 50 mg per kg, mercury below 0.5 mg per kg, arsenic below 10 mg per kg

Pathogens: absence of Salmonella in 25 grams, E. coli below 100 colony forming units per gram

Weed seeds: maximum 2 seeds per liter

Hebei Wangdalei Trading Co., LTD supplies biological organic fertilizer that meets these specifications, with third‑party inspection available at buyer’s request.

Packaging Options

Hebei Wangdalei Trading Co., LTD offers biological organic fertilizer in:

25 kg woven polypropylene bags with inner liner

40 kg bags for regional distribution

1,000 kg jumbo bags for large‑scale application

Custom packaging with buyer’s brand for orders above 200 tons

Each bag is labeled with product name, microbial count, organic matter content, batch number, and application instructions.

Conclusion

Biological organic fertilizer supplies organic matter and beneficial microorganisms to improve soil structure, water holding capacity, and nutrient availability. Application rates range from 500 to 4,000 kg per hectare depending on crop type. When combined with NPK compound fertilizer, biological organic fertilizer can reduce synthetic fertilizer requirements while maintaining yields. Hebei Wangdalei Trading Co., LTD supplies biological organic fertilizer with documented organic matter content, microbial counts, and heavy metal analysis.