Water-soluble / specialty fertilizers
Seaweed Extract — 40% Soluble Kelp Biostimulant for Fertigation & Foliar Programmes
FOB Black Sea / MENA · CFR/CIF worldwide on request
Indicative price
USD 656–800 / MT
Indicative range, firm quote on request
Key parameters
Quick contact
Full product details
Product overview
Seaweed extract is a concentrated powder produced by alkaline hydrolysis and spray-drying of sustainably harvested marine algae — primarily Ascophyllum nodosum and Laminaria species. The process releases alginic acid, mannitol, amino acids and naturally occurring cytokinins, auxins and betaines that act as plant biostimulants rather than direct nutrient sources. At 40% organic matter on a dry basis, one tonne of powder replaces several tonnes of raw wet kelp in blending operations, cutting freight cost per unit of active marine bioactives delivered to the crop.
Growers apply seaweed extract through drip fertigation to improve root vigour, salt-stress tolerance and nutrient-use efficiency in saline or sandy soils. Foliar programmes on fruit trees, vines and greenhouse vegetables use dilute sprays at key phenological stages — transplant, flowering and post-harvest recovery — to shorten stress recovery time after heat or drought events. Liquid-fertilizer compounders dissolve the powder into finished biostimulant products for distribution to horticulture cooperatives, export-oriented berry farms and broad-acre programmes seeking organic-input alternatives to synthetic growth regulators.
Supply origins include cold-water kelp processing lines in Ireland, Norway, Chile and Qingdao coastal facilities with access to both Atlantic and Pacific biomass. The fully water-soluble powder form suits container export to blending plants that lack on-site hydrolysis capacity and need a stable, low-moisture input with twelve-month shelf life under dry storage.
Full specification
| Seaweed extract (organic matter) | 40% min |
| Alginic acid | 10% min |
| Mannitol | 3% min |
| Amino acids (total) | 2% min |
| Water solubility (20°C) | 100% |
| Moisture | 5% max |
| pH (1% solution) | 7.5–9.0 |
| Appearance | Dark brown fine powder |
| Particle size | <80 mesh (180 μm) standard; <200 mesh on request |
| HS code | 1302.19 |
- FOB
- CFR
- CIF
- Fertigation
- Foliar
- Biostimulant
- Organic input
Loading ports & logistics
Seaweed extract powder ships as non-hazardous organic fertilizer input under IMDG general cargo rules. The product is hygroscopic — PE-lined bags and container desiccants are standard to prevent caking during ocean transit through humid trade lanes.
FOB from Black Sea container terminals and MENA repackaging hubs. Standard parcel: 20 MT per 20-foot container (25 kg PE-lined PP woven bags, palletised) or 100–300 MT FIBC parcels on coaster vessels for regional distribution centres. Powder grades load at 150–250 bags/hour with forklift handling.
CFR/CIF to South Asia (Nhava Sheva, Mundra, Colombo), East Africa (Mombasa, Dar es Salaam), Middle East (Jeddah, Jebel Ali) and Mediterranean horticulture ports. Lead time 12–24 days from contract to loading window, subject to spray-dryer capacity and species-specific harvest cycles at origin.
Packaging & documentation
Standard export pack: 25 kg PE-lined PP woven bags, palletised (40 bags per pallet) and stretch-wrapped for container loading. One-tonne FIBC big bags with moisture-barrier liner available for inland blending plants and liquid-fertilizer factories with pneumatic conveying. Fine-mesh powder (<200 mesh) ships in double-lined bags to minimise dust during discharge.
Each lot includes mill certificate of analysis (organic matter, alginic acid, mannitol, moisture, water solubility, pH), commercial invoice, packing list and bill of lading. Certificate of origin, phytosanitary clearance where required by destination customs, and third-party inspection at loading (SGS, Bureau Veritas) available for LC-backed contracts. SDS per GHS and organic-input eligibility letter supplied on request.
FAQ
Which seaweed species are used in this extract and does it matter for crop response?
The concentrate is produced from Ascophyllum nodosum and Laminaria (kelp) biomass harvested from cold North Atlantic and Pacific coastlines. Ascophyllum delivers higher cytokinin and betaine content suited to stress recovery and fruit set, while Laminaria contributes more alginic acid and mannitol for osmotic balance under salinity. Blended extracts give broader phytohormone coverage than single-species lots — specify species preference when ordering for proprietary formulation work.
When should seaweed extract be applied — foliar spray or through drip fertigation?
Both routes are effective. Foliar application at 0.05–0.1% (0.5–1.0 g/L) during vegetative growth and pre-flowering delivers rapid cytokinin uptake through leaf cuticles. Fertigation at 1–3 kg/ha per irrigation cycle builds cumulative root-zone stimulation across the season. Apply in early morning or late afternoon for foliar work to avoid midday evaporation; in drip systems, inject after the main NPK pass to prevent tank incompatibility with concentrated calcium or phosphate stocks.
Is seaweed extract compatible with crop-protection chemicals in tank mixes?
Seaweed extract is generally compatible with most fungicides and insecticides when pH of the working tank stays between 6.5 and 8.0. Avoid mixing with strongly alkaline copper formulations or oil-based adjuvants above 1% — alginates can gel and block spray nozzles. Conduct a jar test on each new combination and apply within four hours of mixing. For organic-certified programmes, confirm the extract lot carries permitted-input status for your certification body before first application.
Related products
- Humic Acid — potassium humate for paired soil-conditioning and biostimulant programmes
- Water-Soluble NPK — fertigation macronutrients for sequential seaweed injection
- Calcium Nitrate — soluble Ca+N compatible with kelp extract in alternate irrigation passes