Competence in
natural raw materials
from renewable


Product key points

  • Liquid fertilizer for a natural and balanced plant nutrition with native Nitrogen, Phosphorous, and Potassium
  • Natural product, free of chemical additives, genetically modified raw materials and synthetic amino acids
  • Contains natural plant extracts, yeast protein and rock phosphate
  • “Made in Germany”
  • Product suitable for use in Organic Farming

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

Product description

BIO-PROTAN®NPK 4-1-5 is a balanced organic-mineral fertilizer made of amino acids, humic substances and microelements. The balanced content of organic acids and primary macro-elements (N, P, K) is ideal for plant nutrition. The product is the result from fermentation of plant extracts and micronization of mineral phosphorous. Rock phosphate suspended in micro-particles is guaranteeing a uniform and homogeneuos distribution in the product, without precipitation.

The gentle processing by evaporation, centrifugation and micronization 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.

We recommend a regular application of BIO-PROTAN®NPK 4-1-5 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 4-1-5 is free from any chemical components that could be harmful to the soil.

Guaranteed analysis (%w/w)

Organic matter 52%
Organic acids:
Humic substances 25%
Amino acids 10%
Betain acid 10%
Polyglutamic acid 4,6%
Citric acid 2,7%
Organic Nitrogen (N) 4%
Organic Carbon (C) 22%
Minerals 9%
Potassium (K2O) 5%
Phosphorus (P2O5) 1%
Sulphur (S) 1%
Calcium (CaO) 0,5%
Magnesium (MgO) 0,1%
B1 3 mg/kg
B2 95 mg/kg
Ash 7%
Water 32%
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 4-1-5 for soil irrigation and fertigation. Foliar application is effective to support soil fertilization:

ml/hl H2O / application
L/ha / application
(2% concentration)
40 L/ha
(with 1.000L 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 4-1-5 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 4-1-5 is stable when stored under normal undiluted conditions. Intended for immediate use when diluted. Close package properly after use. The original product in the state in which it is delivered is hazard–free concerning the transmission of pathogens. Close package properly after use. Shake well before use.


Size Units/pallet Pallet dim. [cm] Net weight Gross weight
5 L / 6,7 kg 96 drums/pal. 120 x 80 x H85 643 kg 707 kg
10 L / 13,4 kg 40 drums/pal. 120 x 80 x H75 536 kg 585 kg
1.340 kg IBC 120 x 100 x H120 1.350 kg 1.400 kg
Protan AG
Runkelsstrasse 38, FL-9495 Triesen
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