Seaweed Extract Black Liquid
The Instant Liquid Powerhouse — Alginic + Fulvic in One
Organic matter ≥ 100 g/L
Fulvic acid ≥ 20 g/L
Potassium as K₂O
Every lot ships with a Certificate of Analysis stating the tested values against the stated Chinese industry standards.
Product Overview
Seaweed extract is a water-soluble organic biostimulant produced from marine brown algae. JINGFENG’s Ascophyllum nodosum extract is obtained by physical crushing followed by enzymatic or biochemical hydrolysis, so the algae’s own alginic acid, seaweed polysaccharides, mannitol, betaine, amino acids and natural plant growth regulators (auxins, cytokinins and gibberellins) are preserved intact. The enzymatic range below is fermented and colour-graded (green, brown and black) for different formulation and label needs, and includes NPK-free grades for organic-only blends.
Seaweed Extract Black Liquid is JINGFENG’s high-content liquid biostimulant: a fermented Ascophyllum nodosum extract with mineral-source organic carbon and fulvic acid built in. It delivers ≥ 40 g/L alginic acid, ≥ 100 g/L organic matter, ≥ 20 g/L fulvic acid and potassium as K₂O ≥ 40 g/L, and dissolves instantly for foliar, drip and flood irrigation. The deep black colour comes from the high load of organic matter, alginic and fulvic acid — a sign of high concentration.
Key Benefits
Ultra-high concentration
≥ 40 g/L alginic acid, ≥ 100 g/L organic matter and ≥ 20 g/L fulvic acid per litre.
Instant solubility
Dissolves instantly with no residue — no pre-dissolving step before the spray tank.
Mineral-source organic carbon
Built-in fulvic acid and organic carbon for fast soil microbial activation.
Complete liquid package
Seaweed extract + fulvic acid + K in one homogeneous liquid; balanced microelements and natural hormones.
COA on every batch
Each lot ships with a Certificate of Analysis stating the tested values against Chinese industry standards.
Technical Specification
| Parameter | Specification | Test standard |
|---|---|---|
| Appearance | Black liquid | Visual inspection |
| pH | 8 – 11 | NY/T 1973-2021 |
| Organic matter | ≥ 100 g/L | NY/T 1976-2010 |
| Alginic acid | ≥ 40 g/L | NY/T 3174-2017 |
| Fulvic acid | ≥ 20 g/L | NY/T 1978-2022 |
| Mannitol | ≥ 6 g/L | HPLC |
| Amino acids | ≥ 6 g/L | NY 1429-2007 |
| Nitrogen (N) | ≥ 1 g/L | NY/T 1977-2010 |
| Phosphorus (P₂O₅) | ≥ 4 g/L | NY/T 1977-2010 |
| Potassium (K₂O) | ≥ 40 g/L | NY/T 1977-2010 |
| Sulphur (S) | ≤ 3 g/L | NY/T 1117-2010 |
| Magnesium (Mg) | ≤ 8 g/L | NY/T 1117-2010 |
| Sodium (Na) | ≤ 4 g/L | NY/T 1972-2010 |
| Boron (B) | 75 – 150 ppm | ICP-OES / ICP-MS |
| Indoleacetic acid (IAA) | 30 – 100 ppm | HPLC |
| Iron (Fe) | 75 – 250 ppm | ICP-OES / ICP-MS |
| Iodine (I) | ≤ 600 ppm | ICP-MS |
| Manganese (Mn) | 8 – 15 ppm | ICP-OES / ICP-MS |
| Gibberellin | ≤ 100 ppm | HPLC / ELISA |
| Zinc (Zn) | ≤ 50 ppm | ICP-OES / ICP-MS |
| Copper (Cu) | ≤ 10 ppm | ICP-OES / ICP-MS |
| Lead (Pb) | ≤ 50 ppm | NY/T 1978-2022 |
| Chromium (Cr) | ≤ 50 ppm | NY/T 1978-2022 |
| Cadmium (Cd) | ≤ 10 ppm | NY/T 1978-2022 |
| Mercury (Hg) | ≤ 5 ppm | NY/T 1978-2022 |
Specification values are guaranteed minimums on a dry basis, taken from the batch Certificate of Analysis and tested against the stated Chinese industry standards. Every shipment travels with its own COA stating the tested values.
Need the full Certificate of Analysis, MSDS, or TDS for your formulation or tender file?
Form & Solubility
Form: black, homogeneous liquid. Unlike powders it dissolves instantly in water, saving time and labour and ensuring uniform application with no residue.
In water: instantly soluble. Mixes evenly into foliar and fertigation programmes.
Handling: keep closed when not in use; shake well before use. Avoid strong-acid tank mixes; use the diluted solution within 24 hours.
How the enzymatic seaweed extracts compare
| Grade | Form | Seaweed active | Organic matter | NPK | Best for |
|---|---|---|---|---|---|
| No NPK Green Seaweed Extract Powder | Powder | ≥ 60% alginic + poly | ≥ 60% | No NPK | Organic-only blends, soil |
| No NPK Brown Seaweed Extract Powder | Powder | ≥ 30% alginate + oligo | ≥ 40% | No NPK | Micronutrient-rich organic blends |
| Enzymatic Brown Seaweed Extract Liquid | Liquid | ≥ 15% seaweed oligo | ≥ 8% | N + P + K | Foliar and fertigation |
| Enzymatic Brown Seaweed Extract Powder | Powder | ≥ 30% alginate | ≥ 60% | N + P + K (K₂O ≥ 16%) | Compound fertilizer blending |
| Enzymatic Green Seaweed Extract Liquid | Liquid | ≥ 40% seaweed oligo | ≥ 15% | N + P + K | High-load foliar |
| Enzymatic Green Seaweed Extract Powder | Powder | ≥ 40% alginate | ≥ 60% | N + P + K (K₂O ≥ 18%) | Premium organic blends |
| Seaweed Extract Black Liquid (this product) | Liquid | ≥ 40 g/L alginic | ≥ 100 g/L | N + P + K (K₂O ≥ 40 g/L) | Instant soil and plant rejuvenation |
The enzymatic range spans NPK-free powders, NPK-bearing powders and ready-to-use liquids. Liquids are dosed per litre (g/L); powders are dosed per kilogram (w/w). Pick the form that fits your blending and application route.
Applications & Dosage
For foliar spray, drip / flood irrigation and seed soaking as a high-content liquid biostimulant.
| Application | How to use | Rate |
|---|---|---|
| Foliar spray | Dilute 500 – 800 times with clean water; spray at seedling, tillering, flowering and fruiting stages. | Dilute 500 – 800× |
| Drip / flood irrigation | Dilute 800 – 1000 times; 1.5 – 3 L per acre per application. | Dilute 800 – 1000× |
| Seed soaking | Dilute 1000 – 1200 times; soak 6 – 12 hours before sowing. | Dilute 1000 – 1200× |
Packaging & Storage
| Pack size | Description |
|---|---|
| 1 L / 5 L | HDPE bottle |
| 10 L / 20 L / 25 L | HDPE drum |
| 200 L / 1000 L | IBC tote |
Storage: Store in a cool, dry, well-ventilated place, away from direct sunlight and high temperature. Keep away from children and livestock; use within 3 months of opening. Shake well before use.
Custom packaging, private-label printing and OEM specifications are available on request. Packaging photos are available in the product gallery.
Successful Cases
Rice cultivation, Jiangsu
Soaked at 1000× and foliar at 600×; germination +15%, yield +12% versus the previous year.
Explore applications →
Field reference
Tomato greenhouse, Shandong
Drip at 900× and foliar at 500×; fruit setting +20%, blossom-end rot −80%.
Explore applications →
Field reference
Apple orchard, Shaanxi
Flood at 1000× and foliar at 700×; soil organic matter +0.8%, premium fruit rate +25%.
Explore applications →
Full case studies with crop data are published in our application sectors.
Frequently Asked Questions
Why is the product black?
The black colour comes from the high content of organic matter, alginic acid and fulvic acid extracted from natural seaweed. These are the core nutrients, and the deep colour indicates high concentration and strong activity.
How do I dilute it?
For foliar spray dilute 500 – 800 times, for drip / flood irrigation 800 – 1000 times, for seed soaking 1000 – 1200 times. Always add the product to water, not water to the product, and use the diluted solution within 24 hours.
Is it safe for crops and the environment?
Yes — it is made from natural seaweed through eco-friendly extraction, free of harmful chemicals. Heavy metals are tightly controlled (Hg ≤ 5 ppm, Cd ≤ 10 ppm) to meet international agricultural safety standards, and it suits organic cultivation.
Can it be mixed with pesticides?
It can be mixed with most neutral and alkaline pesticides and fertilizers. Avoid strong acids; a small-scale compatibility test is advised before large-scale application.
Do you provide a COA per batch?
Yes. Every shipment travels with a Certificate of Analysis stating the tested alginic acid, organic matter, fulvic acid and K₂O.
What is the minimum order and lead time?
Standard stock item. MOQ one pallet of drums / IBC; 7 – 15 days ex-works. Private-label printing available on request.
Also Available in This Family
Enzymatic Green Seaweed Extract Powder – Alga GSP 50%
Enzymatic Green Seaweed Extract Liquid – Alga L 40% Biostimulant
Enzymatic Brown Seaweed Extract Powder – Bio-Alga BSP
Enzymatic Brown Seaweed Extract Liquid – Alga L 15% Biostimulant
No NPK Brown Seaweed Extract Powder – Enzymatic Biostimulant
No NPK Green Seaweed Extract Powder – Enzymatic Biostimulant
20% Seaweed Extract Big Flakes – High-Load Biostimulant
18% Seaweed Extract Micro Granule – High-Alginic Biostimulant
18% Seaweed Extract Big Flakes – High-Alginic Soil Conditioner
16% Seaweed Extract Big Flakes – Water-Soluble Biostimulant
25% Seaweed Extract Micro Granule – Maximum-Alginic Grade
25% Seaweed Extract Big Flakes – Maximum-Alginic Grade
20% Seaweed Extract Micro Granule – High-Load Biostimulant
14-16% Seaweed Extract Small Flakes – Water-Soluble Biostimulant
14-16% Seaweed Extract Micro Granule – Water-Soluble Biostimulant
12% Seaweed Extract Small Flakes – Water-Soluble Biostimulant
12% Seaweed Extract Powder – Organic Biostimulant Raw MaterialNeed a quotation or a sample?
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