Rizospirillum ST Argentina

Rizospirillum ST is a high-performance biological inoculant developed by Rizobacter, based on selected strains of Azospirillum brasilense, one of the most widely recognized plant growth-promoting rhizobacteria (PGPR) in modern agriculture.

Applied directly to the seed, Rizospirillum ST colonizes the root surface and surrounding rhizosphere from the earliest stages of germination, establishing a beneficial association with the developing plant. This interaction promotes vigorous root growth, improves nutrient acquisition, and enhances the crop’s ability to access water and soil resources throughout the growing season.

In cereal crops such as corn, wheat, sorghum, rice, and other grasses, Rizospirillum ST stimulates plant vigor through a combination of biological nitrogen fixation and natural phytohormone production. It is also an excellent tool for co-inoculation in soybeans and other legumes, where it works synergistically with Bradyrhizobium species to maximize root development, nodulation efficiency, and yield potential.

By strengthening the root system and improving nutrient-use efficiency, Rizospirillum ST helps crops perform more consistently under both favorable and stressful environmental conditions.

Mode of action

• Root growth stimulation: Produces phytohormones such as auxin, cytokinin, and gibberellin, promoting root development, branching, and overall root surface area.
• Biological nitrogen fixation: Contributes atmospheric nitrogen to the rhizosphere, improving nitrogen availability for plant uptake.
• Enhanced nutrient uptake: Improves the efficiency of nutrient acquisition and utilization, particularly during early crop development.
• Improved seedling vigor: Promotes faster germination, uniform emergence, and stronger early growth.
• Stress tolerance: Enhances plant resilience to drought, salinity, and osmotic stress conditions.
• Rhizosphere enhancement: Improves root-microbe interactions and, in legumes, can stimulate nodulation and increase the efficiency of biological nitrogen fixation when co-inoculated with rhizobia.

Crops: Cereals, row crops and veggies

Main Crops: Corn, Soybean, Tomato