Competence in
natural raw materials
from renewable


Product key points

  • Liquid fertilizer for a natural and balanced plant nutrition with native Nitrogen and Potassium
  • Vegetal origin, free of genetically modified raw materials, chemical additives and synthetic amino acids
  • Contains natural plant extracts and yeast protein
  • “Made in Germany”
  • Product suitable for use in Organic Farming in accordance with Regulations (EU) No 2018/848 and 2021/1165 and the NOP Regulation. Control ECOCERT F-32600.

Values given have to be seen within natural deviations and analytical tolerance.Analysis by HPLC method.

Product description

BIO-PROTAN® 4-0-5 is a balanced organic fertilizer made of amino acids, humic substances (humic and fulvic acids) and betaine.

The gentle processing by evaporation and centrifugation of plant extracts helps to preserve the natural characteristics of all organic acids in the product. Organic potassium and nitrogen are together with trace elements and vitamins right available for the plant and guarantee a high nutritional value without leaching losses. Fifty percent of organic nitrogen are available within the first two weeks after the application whilst the rest is available within the following two to four weeks.

We recommend a regular application of BIO-PROTAN®NPK 4-0-5 for plant nutrition, to favour microbial flora (Azotobacter/ Pseudomonas) and to improve the texture and structure of the soil. Increased fine root growth and plant enzyme activity will raise the quality and boost the quantity of the agricultural production.

BIO-PROTAN®NPK 4-0-5 is free from any chemical components that could be harmful to the soil and crops.

Guaranteed analysis (%w/w)

Organic matter 52%
Organic acids:
Humic substances 25%
Amino acids 10%
Betain acid 10%
Pyroglutamic acid 4,6%
Citric acid 2,7%
Organic Nitrogen (N) 4%
Organic Carbon (C) 22%
Minerals 8%
Potassium (K2O) 5%
Sulphur (S) 1%
Calcium (CaO) 0,5%
Magnesium (MgO) 0,1%
Phosphorus (P2O5) 0,1%
B1 3 mg/kg
B2 95 mg/kg
Ash 7%
Water 33%
Total 100%
Viscosity (Brookfield 20°C) 1.000 mPas
pH-value 5,0 - 6,0
Density 1,35 kg/L

Directions for use

We recommend BIO-PROTAN®NPK 4-0-5 for soil irrigation and fertigation. Foliar application is effective to support soil fertilization:

ml/hl H2O / application
L/ha / application
(2% concentration)
50 L/ha
(with 1.000 L H2O/ha)
GENERAL RECOMMENDATION Foliar application: 400 – 1.000 ml/hl
Sprayer concentration: 300 – 800 ml/hl
Soil irrigation: 25 – 50 L (max. 5.000 ml/100L)
Fertigation: 0,8 – 1,5% (max. 15 L/ha)
(Tomatoes, Salads, Peppers)
200 – 500 ml/hl
2 - 4 applications
5 – 10 L
2 - 4 applications
(Pome-, Stone-, Soft- Fruit)
300 – 1.000 ml/hl
before and after flowering
10 - 15 L
2 applications; before and after flowering
Strawberries 500 ml/hl
3 application; 2 before flowering,
after flowering as required
10 L
1 application before flowering,
after flowering as required
Vineyard 500 – 1.000 ml/hl
4 applications; first before flowering
10 – 15 L
4 applications; first before flowering
Flowers 500 – 1.000 ml/hl
3 - 5 applications. No on top of flowers
10 – 15 L
3 - 5 applications. No on top of flowers

Dilute BIO-PROTAN® NPK 4-0-5 before using it on plants. For drip irrigation systems ask for special recommendations. In case of inexperienced handling, we recommend a preliminary test on small areas before extending the treatment to the entire culture. The dosages advised are purely indicative and may vary depending on crop, crop vegetative cycle, climatic conditions and average yields expected.

Handling and storage

BIO-PROTAN®NPK 4-0-5 is stable when stored under normal undiluted conditions. Intended for immediate use when diluted.


Size Units/pallet Pallet dim. [cm] Net weight Gross weight
1.000 L/1.350 kg IBC 120 x 100 x H120 1.350 kg 1.410 kg
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Runkelsstrasse 38, FL-9495 Triesen
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