7 Reasons why Farmers are Making the Shift to Natural Fertilisers

As the world becomes increasingly aware of the importance of sustainability, many farmers are moving away from using chemical fertilisers, towards a more natural approach, like using Fish Hydrolysate Fertiliser.  In this article we uncover a few reasons why farmers are making the shift.

1. Natural Fertilisers are More Cost-Effective

Only 10-40% of chemical nitrogen fertiliser is taken up by plants because it is highly mobile.  This means 60-90% goes elsewhere, like into waterways.

Chemical nitrogen fertiliser does not accumulate in soil, in the form of a nitrogen bank, which means most of the farms financial input is literally going down the drain.

Natural Biological Fertilisers are derived from organic sources such as fish, seaweed, and plant-based materials. When these organic materials are cold fermented they contain beneficial microorganisms that activate soil microbes who in turn enhance nutrient availability and overall soil health.

By utilising these natural inputs, farmers can gradually reduce their dependence on costly chemical-based fertilisers, thereby minimising the expenses associated with purchasing and applying synthetic products.

Increased Productivity from Healthier Soil

One of the key advantages of using natural or biological fertilisers is their ability to improve soil structure and fertility over time.

The microorganisms present in these fertilisers break down organic matter into essential nutrients that are readily absorbed by plants. This promotes healthy root development, enhances nutrient uptake efficiency, and ultimately leads to improved crop yields.

Reduced Fertiliser Runoff and Waste

Natural biological fertilisers promote sustainability by reducing nutrient runoff and preventing groundwater contamination. Unlike synthetic fertilisers, which can leach into water bodies and cause ecological harm, natural alternatives release nutrients more slowly and in a controlled manner.

As farmers cultivate healthier soil ecosystems, the need for biological inputs can decrease over time, yet crop productivity remains positive. Transitioning to fully organic practices takes time, but incorporating natural fertilisers into current systems is a cost-effective step toward regenerative agriculture.

By gradually reducing reliance on synthetic fertilisers and fostering soil health, farmers can build resilient ecosystems that support long-term productivity while minimising environmental impacts.

Reduced Water Wastage

John Kempf, at Advancing Agriculture, advocates for reducing reliance on synthetic nitrogen fertilisers, which can disrupt soil microbial communities and lead to inefficiencies.

Kempf highlights that excessive nitrogen increases a plant’s water requirements by up to 30% and can consume as much as 20% of total photosynthetic energy, creating a yield drag effect.  

Instead, Kempf promotes strategies like the rhizophagy cycle, where plants derive nutrition from living soil microorganisms by absorbing microbes through their roots. This approach aims to reduce the need for synthetic fertilisers and pesticides, aligning with regenerative practices that enhance soil health and crop resilience.   How Excess Nitrogen Creates Yield Drag – John Kempf

2. Manufacturing of Chemical Fertiliser has a Heavy Emissions Toll

The manufacturing process of chemical fertilisers has a significant impact on emissions. Chemical nitrogen fertilisers, in particular, contribute to substantial greenhouse gas emissions and environmental degradation.

Chemical nitrogen fertilisers are synthesised using energy-intensive processes that require the use of fossil fuels.  Ammonia, a nitrogen-containing compound, has to be made at a high pressure under high temperatures—meaning it takes a lot of energy to manufacture.  Most of that energy comes from burning fossil fuels like coal and methane gas, which give off CO₂ greenhouse gas. 

The production of these fertilisers releases large amounts of carbon dioxide (CO2) and nitrous oxide (N2O) into the atmosphere, both of which are potent greenhouse gases that contribute to global pollution.

Fish hydrolysate is a nutrient-rich, natural fertiliser providing bioavailable nitrogen and essential micronutrients for plants

In contrast, natural fertilisers offer a more sustainable alternative. One such example is fish hydrolysate, which is derived from fish waste or by-products.  Unlike chemical fertilisers, the manufacturing process for fish hydrolysate typically involves less energy consumption and emits far fewer, if any, greenhouse gases.

By transitioning from chemical nitrogen fertilisers to natural alternatives like fish hydrolysate, we can reduce the emissions toll associated with the manufacturing process, while still providing essential nutrients to support plant growth.

This shift towards more sustainable practices in agriculture can contribute to mitigating global pollution and promoting long-term environmental stewardship.

3. Overuse of Chemical Fertiliser Leads to Water Pollution

Chemical nitrogen fertiliser use has a significant impact on waterway systems, and understanding its effects is crucial for environmental conservation and regenerative agriculture.

Nitrogen is an essential nutrient for plant growth, but when it is used in a synthetic form, and enters waterways in excessive amounts, it can lead to dangerous consequences.

Chemical nitrogen fertiliser primarily enters waterways through agricultural runoff and wastewater discharge. Chemical fertilisers, commonly used in agriculture, often contain high levels of nitrogen, which is easily washed away by rain or irrigation.

Synthetic Nitrogens Harmful Consequences

Once in the waterway system, chemical nitrogen fertilisers can cause various problems. One of the most concerning issues is eutrophication, where excessive nutrients stimulate the growth of algae and other aquatic plants. This overgrowth depletes oxygen levels in the water as these organisms decompose, leading to hypoxic conditions that harm fish and other aquatic life.

Additionally, chemical nitrogen fertiliser can contribute to the formation of harmful algal blooms (HABs). Some species of algae produce toxins that are detrimental to both aquatic ecosystems and human health. These toxins can accumulate in shellfish or contaminate drinking water sources, posing risks to wildlife and human populations.

How To Mitigate Harmful Consequences of Synthetic Nitrogen

To mitigate the impact of chemical nitrogen fertiliser on waterway systems, proper management practices are essential. This includes implementing responsible agricultural practices such as regenerative farming techniques and reducing or eliminating synthetic fertiliser application rates.

Furthermore, raising awareness about the importance of reducing chemical nitrogen fertiliser inputs among farmers, policymakers, and the general public is vital for long-term environmental sustainability.

By understanding the consequences of excessive chemical nitrogen fertiliser use on our waterway systems, we can work towards implementing effective solutions that protect these valuable ecosystems for future generations.

“If we want clean water, we have to get the biology back in our soils. If we want to grow and harvest crops, we have to build soil and fertility with time, not destroy it. The only way to reach these endpoints is to improve the life in the soil.”
– Dr. Elaine Ingham.

4. Natural Fertilisers have Long-Term Beneficial Effects

Studies have shown that because natural fertilisers, such as Fish Hydrolysate, helps to build soil biology, it is therefore more effective in the long term, than chemical nitrogen.

Anything that damages soil biology, such as high quantities of UAN fertiliser, pesticides and fungicides, are going to have long-term negative effects on soil health and overall productivity.

Organic Nitrogen and Essential Minerals

Fish hydrolysate is rich in essential nutrients such as nitrogen, phosphorus, potassium, and trace minerals. Its natural nitrogen content makes it a valuable source for promoting healthy plant growth and development. Unlike synthetic fertilisers, that can have negative environmental impacts, liquid fish hydrolysate is an environmentally friendly choice due to its organic nature.

Soil Improver

One of the long-term benefits of using liquid fish hydrolysate is its ability to improve soil health. It enhances microbial activity in the soil, promoting nutrient cycling and improving overall soil fertility. The presence of beneficial microorganisms helps break down organic matter into plant-available nutrients, creating a more nutrient-rich environment for plants to thrive.

Crop Resilience

Furthermore, regular application of liquid fish hydrolysate can enhance plant resilience against diseases and pests. The amino acids and other bioactive compounds present in fish hydrolysate stimulate plant defense mechanisms, making them less susceptible to common pathogens and insect attacks.

Enhanced Root Development

Another advantage lies in its ability to enhance root development. Naturally cold processed liquid fish hydrolysate promotes root elongation and branching, leading to stronger root systems that can access nutrients more effectively from the soil.

Additionally, using liquid fish hydrolysate as an organic nitrogen source can contribute to sustainable farming practices by reducing reliance on synthetic fertilisers. This reduces the risk of nutrient runoff into water bodies and minimises environmental pollution.

5. Natural Fertilisers Pose Fewer Health Risks For Farmers

Exposure to chemical nitrogen can have detrimental effects on human health. It is important to understand the potential risks associated with this compound and take necessary precautions to minimise exposure.

Reduced Lung Implications

Exposure to chemical nitrogen can lead to a range of health problems. Inhalation of nitrogen-based compounds can cause respiratory issues such as coughing, wheezing, and shortness of breath. Prolonged exposure may result in more severe conditions like bronchitis or even asthma.

Less Skin Problems

Skin contact with chemical nitrogen can cause irritation, redness, and in some cases, dermatitis. It is crucial to avoid direct contact with these substances and take proper safety measures such as wearing protective gloves and clothing.

Long-term exposure to chemical nitrogen has been linked to potential reproductive issues and developmental disorders. Pregnant women should be particularly cautious as exposure during pregnancy may pose risks to the developing fetus.

How to Mitigate Risk of Over Exposure

To minimise the risk of health problems associated with chemical nitrogen exposure, it is essential to follow common sense alongside safety guidelines and use, and wear appropriate protective equipment when handling or working around these substances. Regular monitoring of air quality in industrial settings where chemical nitrogen is used is also crucial for maintaining a safe working environment for employees.

By contrast, organic nitrogen, in the form of Fish Hydrolysate is safe for use by humans and does not negatively impact human health or the environment.

6. Chemical Fertilisers can be Detrimental to the Digestion of Ruminants

Plants that grow in highly synthetically fertilised soil are commonly deficient in iron, zinc, carotene, vitamin C, copper and protein.

Chemical nitrogen fertilisers, often referred to as synthetic fertilisers, have long been used in agricultural practices to enhance crop growth and increase yields. However, recent research has shed light on some of the damaging effects these fertilisers have on the digestion of ruminants and soil microorganisms.

High quantities of synthetic fertilisers can damage the natural makeup of soil in the long term by destroying beneficial microorganisms, and increasing the nitrate levels of the soil. Plants produced from such soil, when consumed by animals, converts into nitrites inside the intestines.

Gut Microbiome Disruptions

Ruminants, such as cows and sheep, have a unique digestive system that relies on a complex network of microorganisms in their rumen to break down plant fibers and extract nutrients.

Unfortunately, the excessive use of chemical nitrogen fertilisers can disrupt this delicate ecosystem. These fertilisers contain high levels of nitrates that can accumulate in plants. When ruminants consume these nitrate-rich plants, it can lead to an overabundance of these chemicals in their digestive system.

Reduced Feed Efficiency

Excessive nitrate levels can inhibit the growth and activity of beneficial microorganisms in the rumen. These microorganisms play a crucial role in breaking down complex carbohydrates into simpler forms that ruminants can digest. When their population is disrupted by chemical nitrogen fertilisers, it can result in reduced feed efficiency and nutrient utilisation by ruminant animals.

To mitigate the negative effects that chemical nitrogen can have on the land, alternative farming practices, and natural microbial products, come to the fore.

The number of farms beginning to rely more on natural sources of nitrogen, such as SONIC Liquid Fish Hydrolysate are growing, as farmers recognise the balance between healthy soil fertility and healthy animals.

7. Chemical Fertiliser Inhibits the Formation of Plant Root Aggregates

Why Are Plant Root Aggregates Important?

Plant root aggregates — especially rhizosheaths and water-stable aggregates — play a critical role in soil health and nutrient cycling, particularly in the natural nitrogen fixation process.

Certain microorganisms, known as diazotrophs, use a special enzyme called nitrogenase to convert atmospheric nitrogen gas (N₂) into plant-available forms like ammonium.

However, this process is highly sensitive and can only occur in micro-aerobic (low oxygen) environments. These conditions are found within the root aggregates, where soil particles are held closely to fine feeder roots by biotic glues such as microbial exudates and root mucilage.

These stable aggregates create protective microsites where diazotrophs can thrive, shielded from full oxygen exposure that would otherwise inhibit nitrogenase activity.

Inside these aggregates, fine feeder roots penetrate deeply and directly interact with the microbial community, absorbing the nitrogen made available through biological fixation.

In essence, these aggregates act as microbial hubs — enabling a continuous exchange between roots and beneficial microbes. Without them, plants would have far less access to natural nitrogen sources and would become more dependent on synthetic inputs.

Maintaining healthy, structured soils with active root aggregation is therefore essential for regenerative, input-reducing farming systems.

Related Articles:

7 Time-Tested Organic Fertilisers for Any Australian Farm

5 Ways to Build Soil Biology for Long-Term Profitability

7 Most Cost-Effective Soil Regeneration Strategies, Australia

How To Make Compost For Your Garden and The Farm

Related External Video Links:

Regenerative Farming YouTube Videos

The Nitrogen Solution – Dr Christine Jones

The information in this article is for general guidance and not professional advice—always consider your individual circumstances or consult with a professional before making decisions.  For more details, please review our full Disclaimer.