FAQ
Frequently Asked Questions
Straight answers about what The Black Stuff is, how it works, and why it matters for Australian food security.
Is The Black Stuff a fertiliser?
No. The Black Stuff is not a fertiliser. It is a natural organic humate — a soil conditioner designed to improve the efficiency of your existing fertiliser program. It helps your fertiliser work harder by improving nutrient retention in the root zone, reducing losses through leaching and runoff. Your program provides the nutrients. The Black Stuff helps keep them where the crop can use them.
How is it different from other humate products (Leonardite, KOH-extracted)?
Most commercial humate products are derived from Leonardite (oxidised lignite or brown coal) and require chemical extraction using potassium hydroxide (KOH) to isolate the active humic compounds. The Black Stuff requires no chemical processing at all. It is sourced from a volcanic peat deposit at Lynch's Crater in Far North Queensland — a maar lake formed 230,000 years ago. The humic activity is native to the raw material. That means zero alkaline extraction, zero synthetic additives, and a fundamentally different product provenance.
What form does the product come in?
The Black Stuff is available in granular solid form only. There is no liquid product. Granular TBS suits spreading, banding at planting, blending with existing fertiliser, top-dressing, and soil incorporation. Two formats are available: Bulk at $770 per cubic metre (inc GST, ex-factory) and 1m³ palleted bags at $990 per bag (inc GST, ex-factory).
Why is there no liquid product?
Liquid products do not have the persistency of the granular form. One of the key benefits of granular TBS is that it is persistent — it does not degrade in the soil. It continues to improve nutrient retention and soil performance across multiple seasons. A liquid form would lose this durability advantage.
How long does it last in the soil?
Granular TBS is persistent. It does not degrade. Evidence suggests it remains active in the soil profile for up to 5 years post-application. Benefits compound over successive applications as soil structure, organic matter, and CEC improve over time. Note: surface applications can dry out and blow away or be washed away. Soil incorporation is recommended where possible.
Does it affect soil pH?
TBS has a low pH. Depending on your soil conditions, some lime balancing may be needed. Discuss with your agronomist relative to your current soil profile and management practices.
Can it really reduce fertiliser use by 30%?
In the right conditions, field trials and operating experience indicate that fertiliser requirements can reduce by up to 30%. This is supported by a 2024 meta-analysis by Ma et al. (published in Agronomy) covering 150+ field studies worldwide, which found an average 27% improvement in nitrogen use efficiency with humic acid application. Individual results vary by soil type, crop, climate, and management.
What crops is it best suited to?
The Black Stuff is best suited to premium and performance-focused growing systems where input efficiency matters: horticulture (grapes, passionfruit, blueberries, vegetables), orchards and tree crops, tropical fruit, and selected banana operations. It is most relevant where crop margins justify premium inputs and long-term soil performance matters.
Why is this a food security issue?
Australia imports 91% of its fertiliser — approximately 3.8 million tonnes of urea annually — with zero domestic production buffer. The shipping lanes through which Gulf fertiliser exports flow are now disrupted. If Australian farmers cannot access enough fertiliser, they cannot grow enough food. The Black Stuff is a 100% Australian-sourced solution that helps stretch existing fertiliser supply further. The fertiliser companies have no incentive to promote it. The government must act.
What is the government being asked to do?
We are calling on Australian politicians to: (1) investigate TBS as a strategic fertiliser extender through CSIRO or state DPI assessment, (2) include TBS in the Federal Fertiliser Supply Working Group agenda, (3) fund government-supported grower trials at scale, and (4) classify domestic soil conditioners as strategic inputs in fertiliser security policy.
Where is it sourced?
Lynch's Crater on the Atherton Tablelands in Far North Queensland. A maar lake formed by volcanic eruption approximately 230,000 years ago. The deposit is 100% Australian with a fully domestic supply chain. No international shipping dependencies.
Is there independent evidence?
Yes. Full laboratory analysis, independent field trial results, and crop-specific observations are available on request. The product competes on verified data, not marketing claims. Published meta-analysis data (Ma et al., 2024, Agronomy) supports the underlying science of humic acid improving nutrient use efficiency.
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