Yes — Yara does sell sulfate of potash products, but their standard granular 0‑0‑50 (like the one you mentioned) is not OMRI approved. For certified organic production, you need an OMRI‑listed sulfate of potash such as Compass Minerals’ Protassium+™ or K+S’s KALISOP® 0‑0‑50, which are explicitly OMRI approved. Yara’s sulfate of potash products are conventional and not listed for organic use.