A renewed partnership brings locally produced, potassium-rich fertilizer to French agriculture while connecting circular production with the growing need for sustainable agricultural inputs
Clermont-Ferrand, 30 September 2026 – Fertilizer production is changing as the agricultural industry looks for reliable nutrient sources that can also support more sustainable farming practices. In France, AFYREN and Terrial are continuing a partnership that connects bio-based manufacturing with the production of potassium-rich fertilizer for farmers.
AFYREN, a greentech company focused on bio-based and low-carbon products, and Terrial, a French company specializing in organic and bio-based fertilizers, have renewed their strategic partnership through a new multi-year fertilizer supply agreement. The contract is worth several tens of millions of euros and covers a significant share of the fertilizer produced at AFYREN NEOXY. Terrial will hold exclusive marketing rights for the product in France.
The partnership began in 2021 and has since developed around a fertilizer produced by AFYREN that is particularly rich in potassium. Terrial processes the material and uses it to create fertilizers under its FORTI K+ brand. The products are designed for a range of agricultural applications, including fruit and vegetable farming, vineyards, orchards, and major field crops.
Potassium is an important nutrient for crops, supporting plant development and several essential biological processes. For farmers, having dependable access to potassium-based fertilizers is therefore an important part of crop management. The companies say the FORTI K+ range provides a locally produced source of potassium for French agriculture.
What makes the collaboration particularly notable is the way AFYREN produces its fertilizer. The company uses fermentation technology based on a circular production model. Its AFYREN NEOXY plant processes local non-food biomass and agricultural by-products to produce bio-based organic acids. The potassium-rich fertilizer is generated as a co-product of this process, giving another material from the production cycle a useful agricultural application.
The fertilizer has also been developed with practical farm use in mind. AFYREN says its compacted format is suitable for different spreading systems used on farms. Earlier agronomic work has also examined its use across crops such as tomatoes, cucumbers, potatoes, and wheat. The product is rich in potassium and low in chlorine, and its manufacturing process is designed to meet organic farming specifications.
The renewed agreement could also have a significant impact on the French potassium fertilizer market. According to the companies, once production reaches full capacity, the fertilizer supplied under the contract could meet nearly one quarter of France’s agricultural potassium sulfate needs.
For AFYREN and Terrial, the agreement represents more than a commercial relationship. It connects industrial biotechnology, agricultural production, and resource efficiency within one supply chain. Instead of treating every production output as waste, the model seeks to create additional value from biological resources and return useful nutrients to agriculture.
The partnership also reflects growing interest in shorter agricultural supply chains. Producing fertilizer within France can provide farmers with an additional local source of potassium while reducing dependence on international fertilizer markets. The companies say the agreement supports their wider commitment to developing a more sustainable French agricultural sector.
As agriculture continues to balance productivity with resource efficiency, circular production models are gaining attention. AFYREN and Terrial’s renewed partnership demonstrates how materials generated through bio-based manufacturing can move back into agriculture, creating another link between industrial production and the farm.
