Field of activity: Research department - Engineering , Manufacturer - Maker


Mézagri is a production and engineering company that develops and markets selections of spontaneous microorganisms, in particular bacterial and fungal complexes from plant composts, for use in agriculture and horticulture with, among other properties :

The improvement of soil quality and in particular its physical (texture, structure, increase in useful reserve), chemical (creation of humus, improvement of the clay-humus complex, increase in CEC) and biological (increase in the biodiversity of microorganisms) properties,
Preserving the quality of water bodies by reducing the loss of nitrogen and phosphorus elements, which cause eutrophication of aquatic environments, through soil leaching,
Reduction of soil salinity,
The fixation of atmospheric nitrogen by symbiotic bacteria, as well as atmospheric CO2 by autotrophic microorganisms, thus increasing the nitrogen and carbon content of soils,
The improvement of plant nutrition (water and nutrients), thanks to bacterial and mycorrhizal symbiosis with the roots, which allows the reduction of water and fertilizer inputs,
The reduction of plant diseases thanks to more disease-resistant plants, thus reducing the use of phytosanitary products,
Composting and valorization of organic materials and effluents into humus: slurry, manure, sludge from sewage treatment plants and fish farms, digestates from methanization,
Improvement of air quality by limiting the volatilization of nitrogen and CO2 during the storage of organic matter, leading to a reduction in odours.

Among the products resulting from Marcel Mézy® Technologies, Bactériosol® and Bactériolit®, standardized organic amendments, are marketed by SOBAC and MEZAMONDE.

Key figures

3 000


Improving Prairie Soil Quality, Yields and Crop Nutritional Quality – Agra-Ost Agronomic Research Centre – Belgium – 2001 to 2016.
33% reduction in field water inputs – JF Berthoumieu – Agralis, CGPA
– 30% nitrate leaching and humic acid content X 2 – EuropSols
40% reduction in soil salinity, doubling of organic matter, leaf and root development and mycorrhizae – University of Marrakech – 2006.
On composts: 50% reduction in dry matter losses and doubling of fixed nitrogen – AgroParisTech 2010 trial
Manure: 40% reduction in dry matter losses and better agronomic valorization – INRA – France – 2002.
Methanisation: production of Methane X 3 – Biocritt
– 82% of ammonia losses (odours) in livestock buildings and 39% increase in organic nitrogen in manure, available for crops (ITAVI, Institut Technique de l’Aviculture) – France – 2007.
Cost in CO2 equivalent to manufacture 2.3 times less than that of a nitrogen fertilizer for the same quantity manufactured – AgroParisTech – Grignon positive energy – 2006.
+ 14% margin and autonomy of farms – Pr Mazoyer – AgroParisTech


17, Route du Maquis Jean-Pierre
12340 - Bozouls - France Phone: +33 (0)5 65 47 93 80

Intervention domains

Biological treatment / Composting fermentation - Carbon Balance - Biogas - Coastal and marine environment - CO2 collection and storage - Combating greenhouse gases technology - Earthmoving and stabilization techniques - Gas and fumes - Groundwater - Clean Development Mechanisms - Gas Pollutants - Collection, transport and treatment of cleansing sludges - Nature reserves - mountains - forests - Indoor air quality - Fermenter, Digester, Methanizer - Environmental approach of urbanism - Combating greenhouse gases - Odorous compounds - Eco-design - Protection of the biodiversity - Eco-design and clean technologies - Sites remediation / decontamination works - Training or awareness - Eco-materials, Eco-design and Eco-products, Alternative raw materials - Methane generation - Recycling and exploiting materials - Regulations - Audit - Consultancy - Studies and Engineering - Sewage, industrial, cleansing and dredging sludge - Seepage water in landfill / leachates - Utilization and waste disposal - Water re-use and saving - Water saver

Certifications, labels or price

Production of organic soil improvers standardized NF U44-051, usable in organic agriculture according to the regulation (EC) N°834/2007 of organic agriculture and according to the NOP (US National Organic Program).

INEL d’or 2013 for our official recognition by the DREAL -Ministries of the Environment and Agriculture- as a technology for transforming livestock effluents into standardized organic amendments.

Coup de coeur 2016 Occitanie Region SME Trophies Award for Moving from RMC.

Key figures

International turnover
500 000€


17, Route du Maquis Jean-Pierre
12340 - Bozouls - France