If you’re looking to boost your farm’s productivity without breaking the bank, you’re in the right place. In this article, we’ll delve into seven time-tested, cost-effective, organic fertilisers that have been the backbone of sustainable farming for generations. From biochar and liquid fish to seaweed, rockphos, compost, and vermicast, these natural wonders are trusted by growers across Australia and world-wide.
Whether you’re a seasoned farmer or just starting out, these organic natural fertilisers will enrich your soil, improve plant health, and enhance your yields. Let’s dig in and explore how these tried-and-true products can transform your farm.

1. Seaweed – Your Crop’s Best Kept Secret
With an incredible source of organic minerals and nutrients, seaweed is among the most versatile organic farming products available.
Kelp Seaweed is rich in essential micronutrients, which help enhance soil structure and stimulate plant growth
Seaweed fertilisers improve water retention in the soil, increase the availability of nutrients to plants, and support the development of beneficial soil microorganisms. As a result, crops grown with kelp seaweed fertilisers are often healthier and more resilient.
How To Use Seaweed on your Crops
One of the standout features of kelp seaweed fertilisers is their versatility in organic farming. They can be used as:
- Seed Inoculant: Harness the natural growth hormones in Liquid Biological Kelp products for increased seed germination rates.
- Soil Conditioner: Seaweed enhances soil texture and fertility, promoting robust plant growth.
- Foliar Spray: Get immediate nutrient uptake through the leaves, boosting plant health and growth rates with liquid seaweed fertiliser.
- Compost Activator: Speed up the composting process by adding seaweed’s essential nutrients and promoting microbial activity.
Application Tips
Integrating organic kelp seaweed fertilisers into various farming activities can maximise their benefits. Here are some best practices for applying these organic farming products:
- Seed Treaetment – Spray or soak seeds with Biological Liquid Seaweed before planting to accelerate germination and early growth.
- Soil Application: Mix dried kelp fertiliser into the soil at the time of planting or as a top dressing during the growing season. This ensures that the nutrients are available to the plants throughout their growth cycle.
- Foliar Spray: Dilute concentrated seaweed products and apply to foliage. This method is particularly effective during periods of rapid growth or stress.
- Compost Activation: Add kelp seaweed to your compost pile to boost its nutrient content and speed up decomposition. This enriched compost can then be used to enhance soil fertility across your farm.
Additional uses for seaweed include;
- Livestock Feed Additive: When added to livestock feed, seaweed can help to improve digestion and nutrient absorption. It also has the potential to reduce methane emissions from livestock, contributing to more sustainable farming practices. See SONIC bio-available liquid seaweed for livestock.
By incorporating kelp seaweed fertilisers into your farming practices, you can improve soil health, enhance plant growth, and support sustainable agricultural methods. These organic farming products offer a practical and effective solution for farmers looking to optimise their operations naturally.

2. Organic Fish Fertilisers – Liquid Protein
Fish-based fertilisers, such as fish hydrolysate fertiliser, is a potent organic solution derived from whole fish, which has been broken down into a liquid form. This method preserves the essential nutrients and beneficial compounds, making liquid fish an excellent choice for organic farming.
Benefits
Organic fish fertiliser is packed with essential nutrients, including nitrogen, phosphorus, and potassium, as well as trace minerals, amino acids, and fatty acids. These nutrients are vital for healthy plant growth and development.
- Promotes Microbial Activity: The organic matter in fish fertiliser supports the growth and activity of beneficial soil microorganisms. These microbes play a crucial role in nutrient cycling, breaking down organic matter, and enhancing soil fertility.
- Boosts Plant Health: Regular use of fish fertiliser can improve plant vigour, enhance root development, and increase resistance to pests and diseases. The nutrients and organic compounds provide plants with a balanced diet, promoting overall health.
Uses
- Soil Drench: Applying fish hydrolysate as a soil drench delivers nutrients directly to the root zone. This method helps in improving soil structure, increasing microbial activity, and ensuring that plants have access to essential nutrients for growth.
- Foliar Feeding: Foliar application involves spraying fish fertiliser directly onto the leaves of plants. This allows for quick nutrient absorption through the leaf surface, providing an immediate nutrient boost and enhancing photosynthesis.
- Compost Enhancement: Adding fish hydrolysate to compost piles accelerates the decomposition process. The nutrients and organic compounds in the fertiliser feed composting microbes, resulting in a richer and more nutrient-dense compost.
Application Tips
- Dilution Ratios: Dilute organic fish fertiliser according to the specific needs of your plants and the manufacturer’s recommendations. A common dilution ratio is 1:50 (1 part fish hydrolysate to 50 parts water) for soil drenching and foliar feeding.
- Timing: Apply fish fertiliser during the early morning or late afternoon to avoid the heat of the day. This prevents rapid evaporation and allows for better absorption of nutrients by the plants. For foliar feeding, ensure the leaves are not wet from rain or irrigation to maximise uptake.
Organic fish fertiliser is a versatile and powerful tool for organic farming, offering numerous benefits and applications. For more detailed information and sourcing options, explore SONIC Natural Farming liquid fish products and affordable supply options.






Join us as we delve into the inspiring journey of pecan and sheep farmers, Wayne and Sue Green, who have harnessed the full potential of SONIC Liquid Fish and Seaweed Biofertilisers to achieve remarkable success.
In this video interview, these innovative farmers share their firsthand experiences and insights on how these organic fertilisers have transformed their agricultural practices. They have explored various applications, including foliar spray, irrigation, and boom spray, as well as feeding the liquid seaweed supplement to their sheep.
This comprehensive approach, and the outcomes so far, has underscored the versatility and effectiveness of using time-tested organic fertilisers in modern agriculture.
Unlock the potential of your land by tailoring organic fertilisers to suit your unique Aussie soil type. The right organic fertilisers—like compost, biochar, or liquid fish—can not only boost crop resilience, but also improve soil fertility and sustainability over time.
Discover some of the most popular natural organic fertilisers you can tailor to your soil. Download our ‘Organic Fertilisers by Soil Type – Quick Guide’ to get started!
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
These products begin working immediately by stimulating soil biology and delivering bioavailable nutrients. Results vary depending on soil condition and management practices.
Early benefits such as improved seed germination and plant establishment can be seen quickly, while longer-term improvements—particularly in grazing systems—build over one to three years. In horticulture and orchards, growers often notice improved growth, quality, and extended shelf life of produce with regular use.
Read more about SONIC Biological Fertilisers
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
SONIC biological fertilisers can help balance soil pH over time by improving overall soil function. The microbes in our biologically fermented fertilisers enhance nutrient cycling and soil structure, which can help buffer pH fluctuations and create more balanced soil conditions.
Rather than directly changing soil pH like lime or other amendments, biological fertilisers work by supporting the natural processes that help maintain a more stable and productive soil environment.
Read article Adjusting Soil pH on Australian Farms (and Why Microbes Matter)
Soil Health FAQs
Yes. Soil health can be improved without relying on synthetic fertilisers by increasing organic matter, supporting soil biology, and using inputs such as liquid fish and seaweed biofertilisers. These approaches help improve nutrient availability, soil structure, and long-term fertility by supporting natural nutrient cycling within the soil.
Read article Can You Improve Soil Health WIthout Synthetic Fertilisers?
The fastest way is to combine organic inputs with biological stimulation. Applying liquid fertilisers such as fish and seaweed can provide immediate bioavailable nutrients while also feeding and stimulating populations of beneficial soil microbes, helping to kickstart nutrient cycling and improve plant response.
Read article Can You Improve Soil Health WIthout Synthetic Fertilisers?
Yes. Liquid fish and seaweed biological fertilisers provide plant-available nutrients and organic compounds that stimulate soil biology. This helps improve nutrient cycling, root development, and overall soil function over time.
Read article Can You Improve Soil Health WIthout Synthetic Fertilisers?
Soil biology drives the breakdown of organic matter and the release of nutrients into plant-available forms. It also supports soil structure and plant resilience, making it a key part of long-term soil fertility.
Read article 4 Good Reasons To Feed Soil Microbes All Year Round
Biological fertilisers activate soil biology by feeding and stimulating the existing microbes already present in the soil. Products such as liquid fish and seaweed fertilisers supply organic compounds, carbon sources, and trace nutrients that help microbes grow and become more active.
As microbial activity increases, key processes begin to improve:
• Organic matter is broken down more efficiently
• Nutrients are released into plant-available forms
• Soil structure and aggregation improve
• Root development and nutrient uptake are supported
Rather than just adding nutrients, biological fertilisers help “switch on” the soil system, allowing it to cycle nutrients more effectively and support consistent, resilient plant growth.
Read article The 7 Most Cost-Effective Soil Regeneration Strategies, Australia
SONIC Biofertiliser Solutions FAQs
SONIC Liquid Fish and Seaweed Biological Fertilisers feed both your plants and your soil, so you get short-term growth support and long-term gains in soil health.
Farmers typically use them to:
- Give plants fast-available nutrients
- Feed and stimulate beneficial soil microbes
- Improve nutrient cycling in the soil
- Strengthen root development and crop resilience
- Build soil structure and long-term fertility
Fish is rich in organic nitrogen and amino acids that drive growth. Seaweed adds trace elements and natural plant compounds that help crops handle stress. Used together, they can cover both what your plants need now and what your soil needs long-term.
See it on a real farm: Simon’s Pasture Improvement Journey →
Read article Top 3 Strategies To Get The Most From Your Biological Fertilisers
There are two ways to get started, depending on how much you use and how hands-on you want to be.
Option 1: Made-to-order (we make it for you)
$2.30–3.90/L, delivered to your farm as a ready-to-dilute liquid concentrate.
- Minimum order: 180L per product
- Freight (additional) quoted to your farm
- Made fresh to order, so allow 10–12 weeks
Best for smaller volumes, or if you’d like to try it before investing in your own system.
Request a made-to-order quote →
Option 2: DIY System (you make it on-farm)
Starter package from $1,885 for a 540L system, which works out to $1.80–3.50/L for your first batch depending on size.
Your starter package includes:
- Raw ingredients for your first batch: Australian organic dried seaweed, dried ocean fish and our proprietary starter cultures
- Assisted setup and 1:1 training (in person or by video)
- VIP support through your first three batches, with guaranteed results when the process is followed
- On-going operational support for the life of the system
Fermentation containers and pumps aren’t included. Most farmers save money by buying these locally, and we’ll help you work out what you need and where to get it. We can also supply them if you prefer.
After your first batch, ongoing production costs just $1.00–1.20/L.
Best for farms using larger volumes that want the lowest long-term cost and control over their own supply.
Calculate Your System Size → | Get a Tailored Quote →
Prices are indicative and in Australian dollars. Your quote confirms the total cost, GST, freight, inclusions and availability.
It mainly comes down to how much you use and how hands-on you want to be.
Made-to-order is the better fit if you:
- Use smaller volumes, or are trying biofertiliser for the first time
- Want a finished product delivered, ready to dilute and apply
- Don’t have the time or space to run your own batches
From $2.30–3.90/L, with a 180L minimum per product.
Making your own is the better fit if you:
- Want the lowest cost per litre (from $1.00–1.20/L after your first batch)
- Want to cut freight costs and rely less on outside supply
- Like the idea of producing fresh product on your own farm
Starter packages start from $1,885 for a 540L system, with 1:1 training and VIP support through your first three batches.
Not sure? Book a free strategy call and we’ll help you work out which option saves you more.
Less than most farmers expect. No experience is needed, because we provide pre-measured ingredients, simple step-by-step procedures and one-on-one training.
Your time:
- Initial setup and start of a (1,000L) batch – approx. 50 minutes
- Decant, clean and restart the next batch – approx. 1 hour 40 minutes
- Final decant and clean – approx. 30 minutes
- That’s roughly 2–2.5 hours of work per 1,000L, often less time than ordering, receiving and handling delivered product
Training and support:
- A 1:1 training session (about 3 hours, in person or by video) as you start your first batch
- VIP support through your first three batches, including check-ins at week 5 and week 10, photo-based progress reviews, and phone and email help
- Guaranteed results on your first three batches when the process guidelines are followed
- Ongoing technical support for as long as your system is running
Explore DIY Biofertiliser Systems → | Book a free strategy call →
Your system is sized to match your spray program, so you produce the right amount on a regular 3-month cycle. You always have fresh product on hand without making more than you’ll use.
Standard system sizes:
- 540L (3 × 180L units), our starter system
- 1,080L (6 × 180L units)
- 2,160L (12 × 180L units)
- Larger farms: systems built with 900L units (IBC’s), sized to suit
To work out your size, we look at your total area, the products you use (fish, seaweed and livestock supplement), and your application rates and timing across the season.
Systems are scalable, so you can start small and add units as your production grows.
Yes. SONIC biofertilisers are 100% natural and can be added to most farming programs, whether you’re fully regenerative or just starting to cut back on synthetic inputs.
Works well with:
- Other natural inputs, such as compost, manures, biodynamic preparations and natural amendments
- Seed treatments, soil drenches and foliar sprays
- Regenerative management practices
Keep separate from:
- Synthetic fertilisers, urea and chemical-based products. Mixing them in the same tank reduces the benefit, because these products can harm the beneficial microbes in your biofertiliser.
Yes. We supply farms across most regions of Australia, from our base in Dorrigo, NSW and Central Coast, NSW.
Made-to-Order Biofertiliser:
Freight is quoted to your farm based on your location and order size. Because you’re shipping finished liquid, freight can be a big part of the total cost, especially for remote farms or large volumes.
DIY Biofertiliser Systems:
We ship dried raw ingredients rather than liquid, which is much lighter and cheaper to freight. Containers and pumps can usually be bought locally, and training can be done by live video, so wherever your farm is, you can get started.
Your quote will confirm freight costs and delivery timing for your area.
With current pressure on fertiliser supply and rising fuel and transport costs, farmers are looking for ways to take self-sufficiency one step further.
Producing inputs on-farm is one option that’s getting more attention.
On-farm biofertiliser production can:
- lower overall cost per hectare
- reduce reliance on external supply chains
- allow applications to be timed around conditions
- make use of fresh biological inputs
For some, producing on-farm is becoming a logical next step—

Want to see how we can help you beat the high cost of fertiliser?
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We are Australia’s leading provider of on-farm systems and training to produce Biological Liquid Fish and Seaweed Fertilisers, supplying all raw ingredients and teaching safe, consistent cold-fermentation methods.













