K4LIBRE

K4libre is an innovative microbial biostimulant developed by OvinAlp research, formulated with Pseudomonas chlororaphis strain 519K4, a KSB bacterium (potassium-solubilizing bacterium).

Presented as a water-soluble wettable powder, K4libre ensures excellent bacterial viability and ease of use.

Its concentrated formulation allows versatile application: soil spraying, soaking, or seed coating, while reducing the environmental footprint associated with transport and container recycling.

Composition

• Improves potassium solubilization in the soil, increasing the efficiency of potassium fertilization

• Stimulates plant growth through the production of growth hormones (auxins) and enzymes that support plant development

• Enhances resistance to environmental stresses (drought, abiotic stress) via hormonal modulation

• Reduces ethylene concentration, a growth-inhibiting hormone during stress periods

• Promotes soil microbial biodiversity, contributing to overall soil and crop health

K4libre can be applied via spraying, soaking, or seed coating, depending on the crop:

Cereal crops (corn, rapeseed, sorghum) :

• 2 applications at 0.2 kg/ha during sowing and/or in spring

Viticulture / Arboriculture :

• 2 applications at 0.5 kg/ha at planting and/or in spring

Vegetables :

• 2 applications at 0.5 kg/ha at planting and/or in spring

Seed coating : according to technical instructions

• 100 g pour un hectare de semences

• Formulation: Water-soluble wettable powder

• Microorganism: Pseudomonas chlororaphis strain 519K4

• Concentration: 1 × 10⁸ CFU/g

• Packaging: 1 kg sachet

• Main function: Potassium solubilization and root stimulation

• Bacterium type: Endophyte, colonizes the interior of roots for improved tolerance to abiotic stress