If you are interested in improving your soil health, you have likely come across two increasingly discussed options: biochar and organic fertiliser. Both promise to improve soil quality, but they work in quite different ways, suit different situations and come at very different price points.
This guide offers an honest comparison to help you decide which approach (or combination) is right for your land.
What is Biochar?
Biochar is a charcoal-like material produced by heating organic biomass (wood chips, crop residues, nut shells) in a low-oxygen environment. This process is known as pyrolysis. The resulting carbon-rich material is highly porous and extremely stable, potentially lasting hundreds or even thousands of years in the soil.
Biochar’s primary claimed benefits include:
- Long-term carbon sequestration (locking carbon in the soil).
- Increased soil porosity and water retention.
- Creating a habitat for beneficial soil microorganisms.
- Improved cation exchange capacity (CEC), helping soil hold nutrients.
What is organic pellet fertiliser?
Organic pellet fertiliser, like SoilWorx products, is made from nutrient-rich organic materials (poultry manure, feather meal, bone meal, seaweed) that are heat-treated and compressed into pellets. Unlike biochar, organic fertiliser delivers both nutrients and organic matter in a single product.
Key benefits of organic pellet fertiliser:
- Immediate and sustained nutrient supply (N, P, K plus trace elements).
- High organic matter content (75%+ in SoilWorx products).
- Feeds soil biology, stimulating microbial activity and nutrient cycling.
- Improves soil structure through organic matter additions.
- Proven efficacy across decades of agricultural use and in trials by respected research institutes such as Rothamsted.
Crop-specific recommendations
|
Factor
|
Biochar
|
Organic Pellet Fertiliser
|
|---|---|---|
|
Nutrient content
|
Minimal (not a fertiliser)
|
High balanced NPK plus trace elements
|
|
Organic matter
|
Stable carbon (does not decompose readily)
|
Active organic matter (feeds soil biology)
|
|
Soil biology effect
|
Provides habitat for microbes
|
Actively feeds and stimulates microbial populations
|
|
Carbon sequestration
|
High (very stable for centuries)
|
Moderate contributes to soil carbon pool but decomposes over years
|
|
Nutrient retention
|
Improves CEC (holds nutrients from other sources)
|
Supplies nutrients directly and builds CEC through organic matter
|
|
Cost per hectare
|
High (typically GBP 500– 2,000+/ha)
|
Moderate (typically GBP 150–400/ha)
|
|
Availability
|
Limited UK supply, quality varies widely
|
Widely available, consistent quality
|
|
Certification
|
No standard organic certification pathway
|
OMRI Listed, Organic Trust certified (SoilWorx)
|
|
Evidence base
|
Promising but still emerging in UK conditions
|
Decades of proven use in UK & Irish agriculture
|
|
Application
|
Specialist: rates and sources need careful selection
|
Standard spreader, well-established rates
|
When to use biochar
Biochar may be worth considering when:
- You are specifically targeting long-term carbon sequestration as part of a carbon credit or sustainability programme.
- You have very sandy soils with extremely low water and nutrient retention, and budget allows for a significant one-off investment.
- You have access to a reliable, quality-controlled source of biochar (quality varies enormously between products).
- You are prepared to combine biochar with a separate nutrient source, as biochar alone will not feed your crops.
When to use organic fertiliser
Organic pellet fertiliser is the right choice when:
- You need to supply plant nutrients and build soil health simultaneously.
- You want a proven, practical solution that works through standard equipment.
- Budget efficiency matters, organic fertiliser delivers more measurable benefit per pound spent.
- You need certified organic inputs for accredited organic production.
- You want consistent, repeatable results from a trusted supply chain.
Can biochar and organic fertiliser work together?
Yes, and in theory, this is where the greatest potential lies. Biochar provides a stable physical structure in the soil, while organic fertiliser supplies the nutrients and active biology to populate that structure. Some research suggests that “charging” biochar with organic fertiliser before application can improve its effectiveness considerably.
However, the combined cost is substantial, and the evidence base for biochar in UK temperate conditions is still developing. For most growers, organic fertiliser alone delivers the soil health improvements they need at a fraction of the cost.
The bottom line
Biochar is an interesting technology with genuine potential, particularly for carbon sequestration. But for the practical business of growing crops, maintaining turf or improving garden soil, organic pellet fertiliser remains the proven, accessible and cost-effective choice.
SoilWorx organic fertilisers deliver measurable improvements in soil health with every application. They supply the nutrients your plants need, build organic matter, stimulate soil biology and improve soil structure: all from a single, easy-to-apply product. No specialist knowledge required, no additional inputs needed.
If and when biochar supply, quality standards and pricing mature, it could become a valuable complement to organic fertiliser. For now, investing in your soil through regular organic fertiliser applications is the most effective way to build healthy, productive land.
Build healthier soil with every application
Explore the SoilWorx range or read our guide to soil conditioning.