Liquid Seaweed Biological Fertiliser 180L+

SONIC Liquid Seaweed Biological Fertiliser (Kelp) is a naturally cold-fermented liquid concentrate, activated with beneficial microbes, used to enhance the health and productivity of soil and plants.

Bulk Supplies starting from 180L, made to order.

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*Allow up to 10 weeks processing of Products to enable maximum shelf-life and biological integrity.

Liquid Seaweed

Biological Fertiliser

SONIC Liquid Seaweed Biological Fertiliser is a 100% natural formula that nourishes plant growth from root to tip.  Activated with beneficial microorganisms, SONIC Liquid Seaweed Kelp Fertiliser can be applied to seeds, plant foliage, and soil, to help promote plant strength, immunity and to stimulate beneficial soil biology.

Biologically activated Liquid Seaweed Fertiliser is a core component in regenerative agriculture, used as a soil conditioner and mineraliser, delivering excellent organic plant nutrition.

Organic Seaweed (Kelp) contains a number of minerals, and trace elements, vitamins, carbohydrates, amino acids, essential fatty acids, growth factors and anti-oxidants. Seaweed also delivers natural alginates, providing superior gelling properties that promote balanced soil moisture levels for optimal plant growth.

Liquid Seaweed Fertiliser Benefits:Seaweed Biological Fertiliser Seed Treatment

  • Delivers organic minerals and trace elements
  • Improves seed germination
  • Contains natural growth hormones
  • Activates beneficial soil microbes
  • Aids plant immunity
  • Increases brix levels

SONIC Natural Farming Liquid Seaweed BioFertiliser is produced using sustainably sourced Australian Seaweed (Kelp).  No fillers, additives or preservatives.

See Suggested Liquid Seaweed Fertiliser Rates & Methods

“Since we started making and applying these natural fertilisers we’ve reduced our running costs, and seen nothing but happy healthy trees.”

Jake - Kilburney Farm

Liquid Seaweed Fertiliser and Feed Supplement


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Not meeting the Minimum Requirements for On-Farm Production? 
Consider a Regional Farmers Cooperative


Biological Products are best used within 3-6 months to get the maximum benefits.  Do not store in diluted form.
Product Use and Storage Information (Download)


Many 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, in a bio-available state.  Read about Biological Fermentation Here.

How Does Liquid Seaweed Fertiliser Work?

Liquid Seaweed (Kelp) Biological Fertiliser has a number of benefits for soil and plant health.  Its beneficial bacteria and seaweed’s chelating ability aids the release of locked-up minerals in the soil.

With Seaweed”s Kelp, unique content, it helps in the formation of carbohydrates, which is necessary for protein synthesis, promotes early growth, improves stem strength, and contributes to cold hardiness.

Containing the hormones gibberellin and auxin, Liquid Seaweed Kelp Fertiliser also functions as a growth enhancer. There are also beneficial vitamins, enzymes, and over 60 trace elements found in naturally fermented Liquid Seaweed Fertiliser.

A high alginic acid content combined with a low percentage of cellulose (the ingredient which gives land plants rigidity), causes Liquid Seaweed Kelp to aid in organic matter decomposition, facilitating its use as an excellent compost accelerator.

When applied directly to the soil, Liquid Seaweed Kelp Fertiliser stimulates soil bacteria.  An increase in biological activity in the soil has many benefits including increases in soil fertility, strong plant growth, and natural plant immunity.

bulk biological fertiliser

Top 5 Benefits: Liquid Seaweed Biofertiliser

SONIC Biologically fermented Liquid Seaweed Fertiliser offers a range of benefits delivering organic minerals and trace elements as well as improving soil fertility.

1. Delivers Organic Minerals and Trace Elements

One key benefit of using Liquid Seaweed (Kelp) Fertiliser is its rich nutrient content. Seaweed is packed with essential minerals, including nitrogen, phosphorus, potassium, and trace elements such as iron, zinc, and magnesium. Because of the cold fermentation process, these essential nutrients are readily absorbed by plants, promoting robust root growth, improved flowering and fruiting, and overall plant vigor.

2. Contributes to Soil Structure

Liquid Seaweed Biological Fertiliser has the ability to promote better soil structure. When applied to the soil, under brown or green ground cover, the compounds present in seaweed help bind soil particles together, resulting in improved soil aggregation. The enhanced soil structure allows for better water infiltration and retention, reducing the risk of erosion and improving overall soil health.

3. Provides Natural Growth Hormones

When Liquid Seaweed Fertiliser is applied to plants, the natural growth hormones, such as auxins, cytokinins, and gibberellins, play a crucial role in regulating various physiological processes in plants, including cell division, elongation, and differentiation.

4. Enhances Taste, Colour and Nutritional Content of Food

One of the key advantages of using Liquid Seaweed Fertiliser is its impact on taste. It has been found that plants treated with Seaweed Biological Fertiliser have improved flavour profiles compared to those grown with chemical-based fertilisers. The natural compounds present in seaweed can enhance the overall taste and aroma of fruits, vegetables, and other edible crops.

Nutrient dense food

In addition to enhancing taste, Liquid Seaweed Fertiliser also contributes to enhancing the colour and texture of food. The minerals and trace elements found in seaweed help plants develop vibrant colours, and improve the visual appeal of fruits and vegetables.

Moreover, Liquid Seaweed Fertiliser is known for its ability to enrich the nutritional content of food.

Seaweed Kelp is rich sources of essential minerals such as potassium, magnesium, calcium, iron, and iodine. When used as a liquid fertiliser for plants, these nutrients are absorbed by the crops and subsequently passed on to consumers when they consume these foods.

5. Increased Plant and Crop Resilience

Another key advantage of using Liquid Seaweed Fertiliser is its ability to boost a plant’s immune system. Seaweed Kelp is rich in bioactive compounds such as polysaccharides, amino acids, and vitamins that stimulate the production of plant defense mechanisms. These compounds help plants to build stronger cell walls, activate defense genes, and produce antimicrobial substances that can fend off diseases and pests.

Liquid Seaweed Biological Fertiliser can also help in enhancing plant tolerance to climatic stresses such as drought, salinity, and extreme temperatures. Seaweed Kelp contains osmoprotectants that help plants retain water during dry periods or excessive salt exposure. Seaweed also contains antioxidants that scavenge harmful free radicals produced under stressful condition.

The organic nature of SONIC Liquid Seaweed Biological Fertiliser makes it an environmentally friendly choice for gardeners and farmers alike. Furthermore, it does not contain synthetic chemicals or harmful additives that can have negative impacts on soil health, the natural ecosystem, or water quality.

Click here to read ‘Key Benefits of Using Liquid Seaweed Fertiliser for Plants’