Custom Fertiliser Manufacturing
Custom fertiliser and crop nutrition manufacturing
SoilWorx operates the UK and Ireland’s largest organic fertiliser production plant, with annual capacity exceeding 50,000 tonnes. Our fully automated manufacturing facility enables us to produce bespoke fertiliser and crop nutrition blends tailored to your exact NPK specification, crop requirements or end-market positioning.
One-off custom formulations, ongoing contract manufacturing, white-label production: we have the capability, capacity and expertise for all of these.
Our capabilities
- 50,000+ tonnes annual capacity: the UK and Ireland’s largest organic fertiliser production facilities
- Fully automated production line: consistent, repeatable quality from batch to batch
- Heat treatment and sterilisation: pathogen-free, weed-seed-free finished products
- Multiple output formats: pellets, crumb, powders and blends to your specification
- In-house quality control: every batch analysed and certified to the agreed specification
- Flexible pack sizes: from 5 kg retail bags to 600 kg and 1,250 kg bulk bags and loose bulk loads
- 40+ years of rendering and processing expertise: backed by parent company College Group
What we offer
Custom NPK Blends
Provide your target NPK analysis, and our formulation team will develop a blend using our organic and mineral raw material portfolio. We can adjust nitrogen, phosphorus and potassium ratios, add specific trace elements, and target particular organic matter levels to meet your agronomic or market requirements.
Contract Manufacturing
For fertiliser brands, distributors and agricultural merchants requiring ongoing production capacity, we offer contract manufacturing agreements with guaranteed supply, consistent quality and flexible scheduling. Minimum order quantities are negotiable based on formulation complexity and production frequency.
White-Label Production
We manufacture and pack under your brand. From label design consultation through to palleted, retail-ready product, SoilWorx provides a complete white-label service. Ideal for garden centre brands, agricultural merchants and export partners who want a premium organic fertiliser range without the capital investment in manufacturing.
Co-Packing & Repackaging
Need existing SoilWorx products repackaged in custom bag sizes, branded packaging or multi-pack formats? We offer co-packing services to support promotional campaigns, trial packs and market-specific packaging requirements.
The Process
Consultation
Share your requirements: target NPK, end use, market positioning, volume expectations and pack format.
Formulation
Our technical team develops a formulation, selects raw materials and provides a preliminary specification.
Trial production
We produce a sample batch for your evaluation and, where required, independent laboratory analysis.
Approval and production
Once you approve the formulation, we schedule production and manufacturing begins.
Quality assurance
Every production run is sampled, tested and certified against the agreed specification.
Delivery
Finished product is palletised and dispatched to your location or direct to your customers.
Why partner with SoilWorx
- Scale: 50,000+ tonnes annual capacity means we can accommodate orders from trial quantities to multi-thousand-tonne contracts
- Consistency: Fully automated production ensures your product is identical from the first bag to the last
- Expertise: Backed by College Group’s 40+ years in rendering, animal by-product processing and organic material handling
- Research credentials: Formulations informed by our partnership with Rothamsted Research
- Certification support: Experience with OMRI and Organic Trust certification processes for products requiring organic approval
- Single-source supply: Raw materials, manufacturing, quality control, packing and logistics under one roof
- Sustainable solution: Every product we make is part of a circular system that turns organic byproducts into nutrient-rich crop nutrition: reducing waste and returning value to the soil.
Frequently asked questions
What is the minimum order quantity for custom blends?
Minimum order quantities depend on the formulation complexity and raw material requirements.
For standard blends using our existing raw material portfolio, we can typically accommodate orders from 5 tonnes upwards. Contact us to discuss your specific requirements.
How long does the formulation process take?
From initial consultation to trial batch, the process typically takes 4–6 weeks. Simple blends using existing raw materials can be faster. Complex formulations requiring sourcing of specialist ingredients may take longer. We will provide a clear timeline at the consultation stage.
Can you manufacture to organic certification standards?
Yes. We hold OMRI listing and Organic Trust certification for our Dynamo and K-Boost products. We can apply this experience and our existing certified supply chains to custom formulations that require organic approval. Certification timelines depend on the certifying body and ingredient traceability.
Do you supply outside the UK and Ireland?
Yes. We currently export to markets across Europe and can accommodate international orders. Our team can advise on export documentation, phytosanitary requirements and logistics for your destination market.
Can I visit the production facility?
We welcome facility visits from prospective partners. Contact our commercial team to arrange a visit to our production plant, where you can see the manufacturing process, quality control procedures and packaging capabilities first-hand.
About SoilWorx
SoilWorx is produced at the UK and Ireland’s largest organic fertiliser plant in Newry, Northern Ireland, part of a circular economy that transforms agricultural by-products into high-value fertilisers. Find out more about how we make our products.
Let's discuss your requirements
Single custom blend or an ongoing manufacturing partnership: our team is ready to help. Contact us to start the conversation.