Agricultural fertilisers
Agricultural fertilisers for crop nutrition
SoilWorx agricultural fertilisers deliver professional-grade organic crop nutrition for arable, grassland, horticultural and mixed farming systems. Every crop nutrition solution is manufactured from sustainably sourced raw materials at the UK and Ireland’s largest organic fertiliser plant, heat-treated to eliminate pathogens and weed seeds, and pelletised for precise, even spreading with conventional equipment.
The SoilWorx agricultural crop nutrition range covers every requirement: balanced NPK base dressings, high-potassium blends for root crops, high-nitrogen formulations for cereals and brassicas. Every formulation is backed by independent field trial data from our research partnership with Rothamsted Research.
Compare our Agricultural Range
|
Product
|
NPK
|
Organic Matter
|
Best for
|
Certification
|
Pack Size
|
|---|---|---|---|---|---|
|
4-2-3
|
75.6%
|
All-round base dressing; arable, grassland, horticulture
|
OMRI Listed,
Organic Trust |
25 kg,
600 kg, 1,250 kg |
|
|
3-2-17
|
52.9%
|
Potatoes, soft fruit, root vegetables, crops requiring high K
|
Organic Trust
|
25 kg,
600 kg, 1,250 kg |
|
|
8-2-2
|
77%
|
Cereals, grassland, oilseed rape, brassicas requiring high N
|
Organic Trust
|
25 kg,
600 kg, 1,250 kg |
|
|
13-0-0
|
High
|
Slow-release nitrogen, organic systems
|
Organic Trust
|
25 kg,
600 kg, 1,250 kg |
|
|
0-0-50
|
N/A (mineral)
|
Chloride-sensitive crops; potatoes, fruit, soft fruit
|
N/A
|
1,250 kg
|
|
|
N only
|
N/A (liquid)
|
Foliar feeds, fertigation, in-season nitrogen boost
|
N/A
|
IBC, bulk tanker
|
Dynamo 4-2-3
Balanced organic NPK
Our flagship agricultural fertiliser, Dynamo 4-2-3 is a poultry manure pellet and soil improver with 75.6% organic matter and a full spectrum of trace elements. Applied at sowing as a controlled-release base dressing, Dynamo feeds your crop through the growing season while building soil organic matter and microbial activity. OMRI Listed and Organic Trust certified for use in certified organic farming systems.
View full Dynamo 4-2-3 specifications and application guidance.
K-Boost 3-2-17
High-potassium for root crops
Specifically formulated for crops that demand elevated potassium, K-Boost blends poultry manure with sulphate of potash to deliver an NPK of 3-2-17. The high K content supports tuber development, yield, skin quality and disease resistance in potatoes. Equally effective for root vegetables, soft fruit and any crop where potassium drives quality. Organic Trust certified.
View full K-Boost 3-2-17 specifications and application guidance
N-Boost 8-2-2
High-nitrogen for demanding crops
When your system demands more nitrogen, N-Boost delivers. At 8-2-2 with 77% organic matter, this is our highest-nitrogen organic pellet: 100% sustainably sourced poultry manure providing sustained nitrogen release for cereals, grassland and brassicas. N-Boost builds soil health while driving the vegetative growth your crops need.
View full N-Boost 8-2-2 specifications and application guidance.
Feather Meal 13-0-0
Slow-release nitrogen
Hydrolysed poultry feathers provide a concentrated, slow-release nitrogen source with an analysis of 13-0-0. The high protein content breaks down gradually in the soil, delivering sustained nitrogen availability across the season without the leaching risk associated with soluble mineral nitrogen. Suitable for both organic and conventional systems.
View Feather Meal 13-0-0 specifications and application guidance
Sulphate of Potash (SOP)
Chloride-free potassium
Liquid N
Foliar & fertigation
A liquid organic nitrogen solution designed for foliar application or delivery through fertigation systems. Provides rapid nitrogen uptake when crops need an in-season boost. Custom concentrations are available. Contact our manufacturing team for specification and pricing.
View Liquid N specifications and application guidance.
Why farmers choose SoilWorx
- Proven nutrient density: Up to 4x the nutrient content of standard compost, with 75%+ organic matter in our core products
- Heat-treated and sterilised: Eliminates pathogens, weed seeds and odour at source
- Consistent quality: Fully automated production delivers batch-to-batch reliability: no surprises in the field
- Easy handling: Pelletised for even spreading with conventional equipment; no specialist machinery required
- Soil health first: Every application builds organic matter, improves soil structure, and feeds soil biology
- Research-backed: Formulations developed in partnership with Rothamsted Research, the UK’s leading agricultural research institution
- Scale and reliability of supply: 50,000+ tonnes annual capacity from the UK and Ireland’s largest organic fertiliser plant
Frequently asked questions
What is the difference between Dynamo, K-Boost and N-Boost?
All three are poultry manure-based organic pellets, but each has a different NPK balance. Dynamo 4-2-3 is a balanced all-round fertiliser. K-Boost 3-2-17 is formulated with high potassium for potatoes and root crops. N-Boost 8-2-2 provides elevated nitrogen for cereals, grassland and brassicas. Use the comparison table above to match the product to your crop’s needs.
Are SoilWorx agricultural fertilisers suitable for organic farming?
Dynamo 4-2-3 is both OMRI Listed and Organic Trust certified, making it suitable for certified organic systems. K-Boost is Organic Trust certified. N-Boost is not currently certified for organic farming. Always check with your certifying body before use.
What application rates should I use?
Application rates depend on your crop, soil type, existing nutrient levels and target yield. As a guide, Dynamo is typically applied at 500–750 kg per ha as a base dressing. Use our Fertiliser Calculator for crop-specific recommendations, or contact your agronomist or qualified adviser for tailored advice.
Can I use these fertilisers with conventional spreading equipment?
Yes. All SoilWorx pelletised products are manufactured to a consistent size and density, allowing even distribution through standard fertiliser spreaders including spinning disc, pneumatic and belt spreaders. No specialist equipment is needed.
How should I store SoilWorx fertiliser pellets?
Store in a dry, covered location away from direct sunlight and moisture. Unopened 25 kg, 650 kg and 1,250 kg bags have a shelf life of 12+ months when stored correctly. Avoid stacking more than three bulk bags high. Once opened, reseal bags to prevent moisture absorption.
Can SoilWorx manufacture a custom blend for my farm?
Yes. Our custom manufacturing service can produce bespoke NPK crop nutrition tailored to your soil analysis and crop requirements. With capacity exceeding 50,000 tonnes per year, we can accommodate orders from single-farm quantities to large-scale contracts. Minimum order quantities apply.
Find the right fertiliser for your farm
Use our Fertiliser Calculator for crop-specific application rates, or contact our team to discuss your requirements and arrange a trial.