Tessenderlo Kerley Inc. (TKI) is a U.S.-based chemical company and subsidiary of the Belgium‑headquartered Tessenderlo Group, with headquarters in Phoenix, Arizona. The company serves North American agriculture through the development, manufacturing, and distribution of specialty crop nutrition and crop protection products.
TKI’s portfolio centers on sulfur-based liquid fertilizers and other specialty nutrients, as well as niche crop protection and soil fumigation solutions offered through its Crop Vitality and NovaSource business units. The company operates manufacturing, terminal, and distribution assets across the United States and Canada and supports customers with agronomic and stewardship programs focused on safe, compliant application.