Seaweed extract has become one of the most widely used biostimulants in modern agriculture. It is valued for its ability to improve plant vigor, enhance stress tolerance, and increase the efficiency of fertilizers and crop protection products.
For fertilizer manufacturers and agricultural input formulators, consistent product quality and reliable supply are just as important as field performance.
FLEXALGA 818 is developed based on Seawin's proven seaweed extraction technology, delivering the core active compounds of seaweed in a stable and formulation-friendly powder.
What Is FLEXALGA 818?
FLEXALGA 818 is a concentrated seaweed extract powder derived from dual seaweed. It retains the natural bioactive compounds responsible for the agronomic benefits of seaweed biostimulants.
Typical Specifications
Alginic Acid: 30%
Seaweed Polysaccharides: 18%
Organic Matter: 26%
Chelated Trace Elements (Ca, Mg, B, Fe, Zn): 5.4%
pH: 5–7
NPK: <4%
This composition combines the natural benefits of seaweed extract with additional chelated micronutrients to support plant nutrition and formulation versatility. Product specifications are based on the technical data sheet for FLEXALGA 818.
How Seaweed Extract Works
Seaweed extract contains a wide range of naturally occurring compounds that support plant growth and resilience.
Alginic Acid
Alginic acid helps improve nutrient chelation and contributes to better nutrient uptake.
Seaweed Polysaccharides
Seaweed polysaccharides support plant metabolism and help crops respond to environmental stress such as drought, heat, and transplant shock.
Natural Plant Growth Regulators
Seaweed naturally contains trace levels of compounds associated with plant growth and development.
Chelated Trace Elements
Calcium, magnesium, boron, iron, and zinc provide essential nutrition and help correct micronutrient deficiencies.
Benefits of FLEXALGA 818
FLEXALGA 818 delivers the same core agronomic benefits expected from a high-quality seaweed biostimulant.
Enhance Crop Stress Resistance
Supports plants under drought, high temperature, salinity, and other adverse conditions.
Promote Vigorous Growth
Stimulates root development, leaf expansion, and overall crop vigor.
Improve Fertilizer Efficiency
Enhances nutrient uptake and increases fertilizer utilization.
Increase Pesticide Performance
Improves spray coverage, compatibility, and overall application efficiency.
Reduce Phytotoxicity Risk
Helps crops recover from stress associated with pesticide applications.
Improve Germination
Supports seed vigor and early establishment.
Seaweed Extract as a Fertilizer Synergist
Many specialty fertilizer manufacturers use seaweed extract as a functional additive to enhance product performance.
Recommended dosage in formulations:
3–10 kg per metric ton of fertilizer
Suitable for:
Water-soluble fertilizers
Liquid fertilizers
Suspension fertilizers
Granular specialty fertilizers
Micronutrient blends
By adding seaweed extract, manufacturers can transform a conventional fertilizer into a value-added biostimulant solution.
Seaweed Extract as a Pesticide Synergist
Seaweed extract is also used as a pesticide synergist to improve crop tolerance and support plant recovery after spraying.
Recommended application:
800–1000 times dilution
Benefits include:
Improved adhesion and spread
Reduced crop stress
Better recovery after treatment
This approach is especially valuable in intensive crops such as fruits, vegetables, and field crops.
Recommended Crop Applications
FLEXALGA 818 can be applied by foliar spray, fertigation, seed treatment, or incorporated into formulations.
Field Crops
Foliar spray: 0.6–1.2 kg/ha
Fruits
Foliar spray: 1.5–3.0 kg/ha
Irrigation: 8–15 kg/ha
Vegetables
Foliar spray: 1.5–2.0 kg/ha
Irrigation: 6–10 kg/ha
Leafy Vegetables
Foliar spray: 0.6–1.2 kg/ha
Irrigation: 5–8 kg/ha
Seed Treatment
0.25–0.5 g/kg of seeds
Why Manufacturers Choose FLEXALGA 818
Proven Technology
Built on Seawin's established seaweed extraction platform and years of commercial application.
Multi-Functional Ingredient
Acts as a biostimulant, fertilizer synergist, and pesticide synergist.
Broad Compatibility
Suitable for many fertilizer and crop protection formulations.
Reliable Supply
Produced by Qingdao Seawin Biotech Group, one of the world's leading manufacturers of marine-based biostimulants.
Technical Support
Supported by Seawin's agronomy and formulation teams.
Typical Applications in Product Development
FLEXALGA 818 is widely used in:
Seaweed-based biostimulants
Water-soluble fertilizers
Micronutrient correctors
Calcium and boron products
Stress resistance formulations
Premium foliar fertilizers
Crop protection adjuvants
About Qingdao Seawin Biotech Group
Qingdao Seawin Biotech Group is a leading manufacturer of marine-sourced biostimulants and specialty fertilizers. The company offers seaweed extracts, chitosan oligosaccharide, fish protein, APAA, and more than 500 customized formulations for agricultural markets worldwide.
Request Samples and Technical Information
If you are developing:
Seaweed biostimulants
Specialty fertilizers
Micronutrient products
Fertilizer synergists
Pesticide synergists
FLEXALGA 818 can help improve product performance while ensuring dependable supply.
Contact us at sales@seawin-bio.com to request samples, technical data, and formulation support.
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