Barley (Hordeum vulgare), one of the key crops in winter cereal rotations across the Mediterranean drylands, often faces structural and biological soil limitations that restrict its productivity.
Low residual fertility, degraded microbiota, and poor soil structure reduce nutrient uptake efficiency and crop resilience, posing a dual challenge for agronomists: maintaining yield while reducing reliance on conventional fertilization and advancing toward more regenerative management models.
In this context, Bulhnova and Bioprón, developed by Probelte, have proven to be valuable biotechnological tools for intelligent biofertilization, acting both on plant physiology and soil functionality.
Microbial Functions in the Cereal Rhizosphere
The effectiveness of Bulhnova and Bioprón is rooted in the activity of plant growth–promoting rhizobacteria (PGPR), selected for their ability to improve nutrient use efficiency and rhizosphere structure.
Bioprón combines specific strains of Azospirillum brasilense M3 and Pantoea dispersa C3, known for their functions in biological nitrogen fixation, phosphorus solubilization, and activation of root metabolism enzymes.
These strains stimulate fine root development, enhance photosynthetic performance, and promote balanced vegetative growth.
Bulhnova, on the other hand, contains a microbial consortium tailored to improve the mineralization of immobilized nutrients and modulate the rhizospheric microbiome. This results in greater availability of nitrogen, phosphorus, and potassium during critical growth stages, optimizing the soil–plant relationship from early phenological phases.
At stages such as BBCH 11 (leaf emergence) and BBCH 29 (full tillering), the combined use of these biofertilizers translates into increased active leaf area, uniform sprouting, and a denser, more functional root system.
Field Evidence: Yield and Crop Health Improvement
In a field trial conducted in Morales del Toro (Zamora, Spain), on clay-loam soil under sprinkler irrigation, Bioprón was applied to barley within a rationalized fertilization program using two applications and a total accumulated dose of 160 kg/ha.
Compared to conventional management, results showed an average yield increase of 73% (kg grain/ha), along with improvements in spike density, crop uniformity, and overall plant health throughout the phenological cycle.
Additionally, the trial observed enhanced soil structure and greater biological activity in the root zone — reinforcing the hypothesis that microbiome activation generates lasting positive effects for subsequent crops in rotation.
Technical Management and Agronomic Impact
Integrating Bulhnova and Bioprón into barley management programs improves nutrient efficiency, reduces fertilizer pressure, and decreases dependence on external inputs, all while enhancing the functionality of the soil–plant system.
From a technical perspective, these biofertilization strategies represent a step forward toward regenerative and profitable agriculture, prioritizing soil health without compromising yield or grain quality.
For the agronomist, microbial bio-stimulation with tools like Bulhnova and Bioprón enables adaptive production strategies aligned with specific soil and climatic conditions, optimizing resource use and increasing crop resilience to abiotic stress and nutritional imbalances.
