Here is the professional English translation of the provided Chinese content:

May 19 News — On May 19, the average ex-factory price of Mannheim process 52% powdered potassium sulfate was 4,300 RMB/ton, up 50 RMB/ton from the previous week. The operating rate of processed potassium sulfate was approximately 45%.

Chempricehub Review of Potassium Sulfate:

Bull/Bear Score: 1

Spot Market: On May 19, the average ex-factory price of Mannheim process 52% powdered potassium sulfate was 4,300 RMB/ton, up 50 RMB/ton from the previous week. The current operating rate of processed potassium sulfate plants was approximately 45%, indicating limited supply-side pressure, which provides supportive factors for potassium sulfate prices.