Biostimulants
Chitosan Oligosaccharide 90% Powder (COS / Enzymatic Oligochitosan)
Marine Biostimulant Derived from Alaskan Snow Crab Shells
Chitosan Oligosaccharides (COS) 90% Powder is a marine-sourced biopolymer elicitor biostimulant extracted from Alaskan snow crab shells for foliar spray, fertigation, and liquid fertilizer formulations. It activates the plant's systemic acquired resistance (SAR) against fungal and bacterial pathogens, suppresses root-knot nematodes and soil-borne diseases, and improves root development under drought, salinity and temperature stress. For field use: foliar spray dilute 1:3,000–1:5,000 (≈20–33 g per 100 L water), repeat every 10–15 days, 2–3 applications per cycle; fertigation and drip irrigation 750–1,500 g/ha. As a liquid formula additive: add 0.5–1.0% w/w into amino acid, seaweed, or micronutrient blends. Packed in 20 kg bags with custom OEM packaging. MOQ 100 kg; standard lead time approximately 10 working days to Shanghai port; batch COA with every shipment.
Technical specifications
Package
20kg Bag
Active Ingredient(s)
- Assay
- 90%
- Degree of Deacetylation (DD)
- 90%
- Molecular weight
- ≤ 1000Da
Physical and Chemical Properties
- Solubility in 20℃ water
- 100%
- pH
- 4.0-7.5
Heavy Metals
- Lead
- ≤ 1ppm
- Arsenic
- ≤ 1ppm
- Cadmium
- ≤ 1ppm
- Mercury
- ≤ 1ppm
Key benefits
- Pristine Arctic Sourcing Crafted from 100% natural, unpolluted Alaskan snow crab shells for uncompromised bio-activity and purity.
- Triggers Systemic Immunity Mimics natural signals to activate the plant's self-defense system against fungal and bacterial pressures.
- Root & Stress Resilience Maximizes root development and enhances crop tolerance to drought, salinity, and extreme temperature fluctuations.
- Eco-Friendly Performance Enhances beneficial soil biology and naturally repels root-knot nematodes for long-term soil health.
- Zero Insoluble Residues for Clean Drip & Sprayer Operation Ultra-low molecular weight (≤1,000 Da) and complete water solubility eliminate sediment and nozzle clogging in drip systems, foliar sprayers, and drone applications.
Suggested dosage & application
Foliar Application: Apply 30–50 g/ha (working concentration of 30–50 ppm; i.e., 3–5 g per 100 L water) every 10–14 days. Active dosages above 20 ppm have been demonstrated in peer-reviewed trials to significantly upregulate PAL defence enzymes and mitigate fungal infections.
Drip Irrigation / Fertigation: Apply 100–300 g/ha (10–30 g per 1,000 m2) via drip systems during vegetative growth or root establishment to suppress soil-borne pathogens and stimulate lateral root branching.
Seed Dressing / Root Drench: Use a 50–100 ppm solution (0.5–1 g per 10 L water) for seed soaking or nursery tray root drenching to prevent damping-off and increase germination rate.
For Industrial Formulators: Blended at 0.1%–0.5% (1–5 kg/MT) as a functional additive in water-soluble fertilizers, biopesticide boosters, or liquid amino acid formulations.
Related products
Frequently asked questions
01What is Chitosan Oligosaccharide 90% (COS) in agriculture?
Chitosan Oligosaccharide 90% (COS / Oligochitosan) is an enzymatically degraded derivative of chitin with low molecular weight (<1000 Da). It acts as a natural plant elicitor that activates Systemic Acquired Resistance (SAR), boosts root development, and improves stress resistance.
02How does COS 90% powder help in root-knot nematode management?
COS serves as a carbon/nitrogen substrate for chitinolytic bacteria in the soil. Boosting these microbial populations accelerates the enzymatic breakdown of nematode egg shells and larval cuticles, effectively suppressing nematode populations.
03What is the difference between standard chitosan powder and chitosan oligosaccharide (COS)?
COS are enzymatically hydrolyzed chitosan with a much lower molecular weight (≤1,000 Da vs. 100,000+ Da for regular chitosan) and a higher degree of deacetylation (≥90%). This gives COS far better water solubility, stronger elicitor activity on plant SAR (systemic acquired resistance), and compatibility with drip and foliar systems without nozzle clogging.
04How does COS 90% powder suppress root-knot nematodes and soil-borne fungi?
COS triggers the plant's chitinase and β-1,3-glucanase pathways, which degrade the chitin-containing cell walls of nematode eggs and fungal hyphae. It also multiplies beneficial chitinolytic bacteria in the rhizosphere (e.g., Bacillus spp., Paecilomyces lilacinus), creating a suppressive soil microbiome that reduces Fusarium, Phytophthora and Meloidogyne pressure over a typical 2–3 application cycle.
05Is COS 90% powder compatible with copper fungicides and zinc micronutrients?
No, COS should not be tank-mixed directly with high-concentration free copper (e.g., copper sulfate) or zinc ions — the highly active positive amine groups on COS will cause instant chelation-flocculation. Apply COS separately, or use chelated forms (EDTA-Cu, EDTA-Zn) at lower rates.
06What is the MOQ, packaging and lead time for COS 90% powder?
COS 90% powder is packed in standard export packaging with OEM customization available. MOQ is 100 kg; lead time is about 10 working days to Shanghai port, and every shipment includes a batch COA.
07How should COS 90% powder be stored?
Store sealed in a cool, dry place below 25 °C, away from direct sunlight and moisture. Shelf life is 24 months from the manufacturing date; keep the packaging tightly closed after use.
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