Seaweed Extract Fertilizers: What Buyers Should Know
Seaweed extract fertilizer is a natural biostimulant made from Ascophyllum nodosum and other seaweeds, rich in alginic acid, mannitol, cytokinins, and trace minerals that boost root growth and stress tolerance. Buyers source seaweed extract fertilizers from China as soluble powder and liquid for foliar and soil application.
The key specifications are alginic acid content, extraction method, solubility, and source seaweed. Cold or enzymatic extraction preserves bioactive compounds better than harsh chemical methods. The curated suppliers below are screened against these criteria.
Curated Suppliers — Seaweed Extract Fertilizers
7 Checks Before Choosing a Seaweed Extract Fertilizers Supplier
1. Alginic acid
Confirm alginic acid and organic matter percentage on the certificate.
2. Extraction method
Prefer enzymatic or low-temperature extraction to preserve bioactivity.
3. Solubility
Fully soluble powder suits foliar and drip systems without clogging.
4. Source seaweed
Ascophyllum nodosum is the most widely used and studied source.
5. Bioactive content
Check mannitol, cytokinin, and betaine levels for biostimulant claims.
6. Heavy metals
Request heavy-metal reports since seaweed can concentrate trace elements.
7. Formulation
Powder, flake, or liquid; match form to your application method.
Frequently Asked Questions
What is seaweed extract fertilizer?
It is a biostimulant derived from seaweed, rich in alginic acid, mannitol, cytokinins, and trace minerals that improve growth and stress tolerance.
What is alginic acid in seaweed fertilizer?
Alginic acid is a natural polysaccharide from seaweed that conditions soil and supports root development and nutrient uptake.
How is seaweed extract fertilizer applied?
It can be applied as a foliar spray, through drip irrigation, or as a soil drench depending on the formulation.
What is the MOQ for seaweed extract fertilizer from China?
Typically 5-10 metric tons for powder; see each supplier profile for liquid drum MOQ.