Thio-Sul Homologation 1-year Anniversary with French Journalists group in Rouen

Thio-Sul®: The Original Agricultural ATS Revolutionizing Crop Nutrition

Tessenderlo Kerley is proud to announce that it maintains its leadership in agricultural innovation with Thio-Sul®, the only ammonium thiosulphate (ATS) product designed and manufactured exclusively for the agricultural sector. Tessenderlo Kerley is the world’s leading manufacturer of ATS and is uniquely positioned to supply a product that meets the highest standards of purity and performance. Unlike other ATS products, which are often yellow and odorous due to impurities, Thio-Sul® is crystal clear and odourless.

Certified for Excellence

Thio-Sul® is a CE fertilizer and was homologated in November 2024 by ANSES in France (AMM No. 1171327), certifying its ‘double-inhibition properties’ against nitrogen losses through volatilization and nitrification (2201529839 | ephy). This certification confirms Thio-Sul® as a safe, effective, and environmentally responsible solution for modern agriculture. All Thio-Sul® production is dedicated to agriculture, with optimized nutrient delivery, and compatibility with UAN and irrigation systems.

Tessenderlo Kerley’s production plant in Rouen, France reinforces our identity as a uniquely French product in the industry. Complemented by our Italian and Dutch facility, which ensures year-round stock availability, we are well-positioned to meet growing customer demand. With nearly a century of expertise, Tessenderlo Kerley stands apart by offering direct access to our in-house agronomists, technical experts, and laboratory scientists— ensuring every blend is rigorously tested and tailored to deliver agronomic precision.

Thio-Sul® delivers proven agronomic and economic value. Field trials across France and other countries show that farmers can maintain yields with up to 20% less nitrogen input—translating into significant cost savings and more sustainable farming. With countless trials validating its performance, Thio-Sul® stands out as the only ATS fertilizer homologated in France (AMM No. 1171327) for its dual inhibition of nitrogen loss. Farmers using alternative products risk greater nitrogen loss, while Thio-Sul® helps protect their investment and the environment.