Mineral and Microbial Soil Amendment
Made from Australian kelp, SONIC Liquid Seaweed Biofertiliser provides naturally occurring minerals and organic compounds to complement your soil and crop nutrition program.
- Made with microbial cultures
- Provides organic material as a food source for soil microbes
- Contains naturally occurring minerals and trace elements
- Suitable for seed treatments, soil applications and foliar spraying
- Available ready-made or produced on-farm with SONIC training and support
See the suggested rates for seed, soil and foliar applications.
SONIC Liquid Seaweed Biofertiliser is derived from sustainably harvested Australian Durvillaea Potatorum (Bull Kelp). Cold processed with beneficial microbe cultures. No fillers, additives or preservatives.
Curious about the benefits SONIC Liquid Seaweed could have on your crops? Give us a call.
Pricing Guide
Choose your Supply Option
MADE-TO-ORDER PRODUCTS
We make your liquid fish and seaweed biofertiliser and deliver it to your farm.
Product Price Range:
$2.30-3.90/L
Includes: Finished liquid concentrate product, ready to dilute and apply.
Size Options: 180L (20L Drums) or 1,000L IBC per product
Freight: Quoted separately for delivery to your farm.
Made to Order: Please allow approximately 10–12 weeks from order confirmation to dispatch. Lead times may vary depending on current production schedules and availability.
*Indicative AUD. Your quote confirms the total cost, GST, freight and inclusions.
ON-FARM PRODUCTION & TRAINING
You make your liquid fish and seaweed biofertiliser with our production system and guidance.
First Batch (Starter Package):
$1.80-3.50/L
Includes: First batch raw ingredients, assisted setup, 1:1 training, dedicated support over three batches, plus ongoing phone and email support.
Initial Investment: Varies according to system size and production requirements. A tailored quotation will confirm your setup costs and inclusions.
Every Batch After:
$1.00-1.20/L
Ongoing Production: Purchase the raw ingredients needed for each additional batch, with no recurring training/setup fee.
*Indicative AUD. Your quote confirms the total cost, GST, freight and inclusions.
SONIC Seaweed Biofertiliser — Suggested Rates
Rates are a general guide and should be adjusted to suit the crop, growth stage and application method. L/ha refers to undiluted product, not spray-water volume. Contact us for dilution instructions, application frequency and a program suited to your farm. See biofertiliser rates and methods page.
| Crop / System | Typical Rate or Dilution | Application |
|---|---|---|
| Seed inoculation | 1:80–1:150 dilution | Light seed coating before sowing |
| Seedlings / microgreens | 1:100–1:200 dilution | Foliar spray or soil drench during establishment |
| Cover crops | 2–5 L/ha | During establishment and early growth |
| Vegetables | 3–8 L/ha | During establishment and crop growth |
| Turf / lawns | 3–10 L/ha | During active growth and recovery after mowing |
| Vines | 4–8 L/ha | During flowering and fruit development |
| Fruit & nut trees | 5–10 L/ha | During active growth and flowering |
| Broadacre crops | 2–6 L/ha | During establishment and early growth |
| Fertigation | 1–5 L/ha equivalent | Through irrigation system as required |
| Grazing / pasture | 3–8 L/ha | During pasture growth and recovery after grazing |
Liquid Seaweed — Indicative Cost per Hectare
Costs shown are indicative product costs per hectare, per application, based on made-to-order pricing of $2.30–$3.90/L and ongoing DIY production costs of $1.00–$1.20/L. DIY costs exclude the one-off starter fee for initial setup and training. Your quote confirms that fee, GST, freight and inclusions.
Rates refer to undiluted product. See biofertiliser rates and methods.
| Product Rate | Made-to-Order Cost/ha | DIY Ongoing Cost/ha |
|---|---|---|
| 1 L/ha | $2.30–$3.90 | $1.00–$1.20 |
| 2 L/ha | $4.60–$7.80 | $2.00–$2.40 |
| 3 L/ha | $6.90–$11.70 | $3.00–$3.60 |
| 4 L/ha | $9.20–$15.60 | $4.00–$4.80 |
| 5 L/ha | $11.50–$19.50 | $5.00–$6.00 |
| 6 L/ha | $13.80–$23.40 | $6.00–$7.20 |
| 8 L/ha | $18.40–$31.20 | $8.00–$9.60 |
| 10 L/ha | $23.00–$39.00 | $10.00–$12.00 |
Estimate Your Usage
SONIC Liquid Seaweed Biofertiliser — Analysis
SONIC Liquid Seaweed is made from Australian kelp using cold fermentation and microbial cultures. The analysis below shows its mineral content and microbial counts from previous testing. Naturally sourced ingredients and fermentation contribute to batch variation. Results are a guide, rather than guaranteed specifications for every batch.
SONIC Liquid Seaweed Analysis
| Nutrient | Amount (mg/L) |
|---|---|
| Nitrogen (N) | 1040 |
| Phosphorus (P) | 100 |
| Potassium (K) | 1600 |
| Sulphur (S) | 700 |
| Calcium (Ca) | 800 |
| Magnesium (Mg) | 500 |
| Sodium (Na) | 700 |
| Iron (Fe) | < 50 |
| Manganese (Mn) | 3.6 |
| Zinc (Zn) | 2.7 |
| Copper (Cu) | 1 |
| Cobalt (Co) | 0.1 |
| Boron (B) | 5 |
| Molybdenum (Mo) | 0.2 |
| Selenium (Se) | 0.05 |
| Iodine (I) | 2.79 |
| Microbes | Amount (CFU/g) |
| Lactic Acid Bacteria | 4200000 |
| Total Active Fungi | 2000 |
| Yeasts | 2000000 |
Analysis sources: Mineral figures are from SONIC Natural Farming’s previous product analysis summary; Iodine: Environmental Analysis Laboratory, Southern Cross University, report dated 11 July 2025. Microbial counts: APAL amended report dated 2 July 2025, expressed in CFU/g.
Product Storage
SONIC Biological Products contain no artificial additives or preservatives.
Use within three months of the packaging date, which marks the completion of the batch. Follow the storage instructions and best-before date on the container. Keep out of direct sunlight.
Biological Products should not be stored in a diluted form.
Farmers Feedback
You really can see the difference, just driving up the road. We’re happy, and it has actually saved us a lot of money on extra fertilisers.
If I see something once and something that dramatic, I know it’s got to be doing good.
I think it’s doing a fantastic job! We have had the best year with the most tree stress.
More Than Just a Fertiliser
The Multiple Uses of SONIC Liquid Seaweed for Soil, Crops and Livestock
- Soil application: use as a soil drench or through irrigation to add kelp-derived organic material and naturally occurring nutrients.
- Mineral source: supplies ocean-derived minerals and trace elements.
- Biostimulant: includes natural seaweed compounds for use within a crop growth and nutrition program.
- Foliar spray: apply diluted product directly to foliage at the recommended rates.
- Compost input: adds organic material and microbial cultures to your composting program.
- Livestock supplement: the same liquid seaweed formulation provides kelp-derived minerals, including iodine.
Talk to us about the best supply option for your farm.
Seed Treatment with Liquid Seaweed Biological Fertiliser
Beneficial microorganisms, contained in SONIC Liquid Seaweed Biological Fertiliser, coat or inoculate the seeds, and are carried with them into the ground, stimulating soil fertility.
When microorganisms are present, they improve the soil and give seedlings the health and immunity they need to start their growth. Meanwhile, kelp seaweed is also high in organic phosphorus, which supports growth and vigour during early plant development.
SEAWEED FERTILISER FACT
Many liquid seaweed fertiliser products today are manufactured using an extraction process. The extraction process generally uses an alkali extraction agent, such as potassium hydroxide. This process inevitably denatures a lot of the original compounds found in seaweed, which are known to have many beneficial uses for plants.
For example, seaweed has a compound called betaine osmoregulators. When applied to plants, in its original form, these osmoregulators make plants a lot more resilient to drought stress. It allows the plant cells to regulate water much better, and require less water, which enhances the plants’ tolerance to stress. Betaine osmoregulators are lost using an alkali extraction method.
Cold processing, or natural fermentation, retains all the original compounds of seaweed, and delivers them to plants in a bio-available state. Read about Biological Fermentation Here.
FAQs
Biological Fertiliser FAQs
Conventional synthetic fertilisers are designed to deliver nutrients rapidly, creating fast and predictable plant responses. When nitrogen, phosphorus, and potassium are applied in synthetic forms, plants often respond with quick greening and a surge in biomass.
Biological fertilisers, on the other hand, work in a fundamentally different way to conventional synthetic inputs. Rather than supplying nutrients in a readily available chemical form, they focus on supporting the living processes within the soil that naturally create fertility over time.
Read article Rethinking Soil Fertility: The True Meaning of Fertiliser
Liquid seaweed extracts, such as Seasol, are usually produced using chemical or heat extraction to concentrate certain compounds. While these products are widely used, the process can reduce some of the natural components of the seaweed. Seaweed biofertiliser, on the other hand, is cold fermented, preserving a wider range of nutrients and natural compounds in a form that supports soil biology and plant uptake.
Read Article – Liquid Seaweed Fertiliser Comparison: Ferment Vs Extract
We service all regions across Australia for both product supply and on-farm production systems. Fresh processed biological fertilisers are delivered nationwide.
For on-farm systems and training, we work with both local and remote operations. Where in-person visits aren’t practical, we provide live video training and guided setup to ensure you can confidently get your system up and running without a hitch.
We source both fresh and dried fish waste, generated after processing for human consumption, from a network of fish shops and processors handling ocean-caught fish across Australia. By utilising these by-products, we help divert organic waste from landfill and repurpose it into valuable liquid fish hydrolysate biological fertiliser.
Read article Turning Fish Waste Into Premium Hydrolysate Fertiliser
