Soil structure
Supports the formation of a more favourable soil structure and rooting environment.
PFC 3(B) - Inorganic Soil Improver
ProtoHumiX® – certified soil improver
A soil improver based on active water-soluble humic and fulvic acids, developed to maintain and restore favourable soil properties. Made in Bulgaria under licence of European patent EP3135655.
PFC 3(B)CE conformityPatent EP3135655Made in Bulgaria
ProtoHumiX® is one product with two separate certified functions: soil improver and non-microbial plant biostimulant.
What is a soil improver?
ProtoHumiX® is an EU fertilising product whose function is to improve soil properties and the conditions in the root zone. Its role is to support the soil environment, not to stand in as a direct replacement for base fertilisation.
PFC 3(B) is the category for inorganic soil improvers under Regulation (EU) 2019/1009.
How ProtoHumiX® supports the soil
Water regime
Contributes to retaining soil moisture and using it more evenly.
Humus processes
Supports the natural processes involved in forming and retaining humus.
Biological activity
Creates more favourable conditions for the natural biological processes in the soil.
Buffering properties
Supports the chemical stability and buffering capacity of the soil.
Unwanted elements
Under suitable soil conditions it may help limit the mobility of certain heavy metals and toxic elements.
When is it used?
- on depleted and degraded soils;
- on sandy and light soils;
- where organic matter content is low;
- where the water regime is unfavourable;
- when preparing fields between harvest and the next sowing;
- on field crops, vegetables, vines, orchards and permanent plantings, according to an agronomic plan.
Soil application
ProtoHumiX® is diluted with chlorine-free water and applied evenly to the soil according to the crop, the soil condition, the current label and the agronomist’s recommendation.
1000 ml ProtoHumiX® in 300 l of water
The treated area and the number of applications are set by the current label and the individual agronomic plan.
Active humic compounds
| Parameter | Published value |
|---|---|
| Total organic matter | 31.9 % |
| Humic substances – total | > 11.5 % |
| Humic acid, active fraction | > 10.1 % |
| Fulvic acid, active fraction | > 1.4 % |
| Hymatomelanic and ulmic acids | 2.0 % |
| Organic carbon | 17.9 % |
| K2O | 1.7 % |
| P2O5 | 1.1 % |
| Total nitrogen content | 0.74 % |
| pH of a 0.5% solution | 8.5–9.2 |
Organic matter and organic carbon are stated on a dry matter basis, according to laboratory report PL/685/2025/AP. The humic-substance, humic-acid and fulvic-acid contents are on a dry matter basis; these three contents and the pH of a 0.5% solution follow the safety data sheet, section 3.3 (page 6). Laboratory results are separate measurements and must be read on their stated basis. Follow the label and accompanying documentation for each batch.
Full technical specificationCertified product function
- Category: PFC 3(B) – Inorganic Soil Improver
- CE certificate: No. CE-B/6/26/BS
- Validity per the available CE document: until 10.02.2031
Frequently asked questions
Does ProtoHumiX® replace mineral fertilisers?
No. The soil improver’s function is to support soil properties. Any change to a fertilisation programme should follow a soil analysis and an agronomist’s recommendation.
When is soil application most appropriate?
The period after harvest and before the next sowing or planting is suitable, aligned with cultivation work and the agronomic plan.
Can it be used in organic farming?
The product has been assessed for use in organic production under the accompanying confirmation. See the conditions on the Organic farming page.
Organic farming conditionsImprove your soil conditions with a suitable agronomic plan
Send us the crop, the area and the soil conditions.
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