Interoceanic Corp. (IOC) on Aug. 18 announced new pricing for PCI’s premium grade granular ammonium sulfate, with postings firming to $220/st FOB Upper Mississippi River locations and $245/st FOB inland Cornbelt locations. Those levels are up $10/st from the company’s summer fill prices announced in early July. IOC is the exclusive distributor of ammonium sulfate produced by PCI Nitrogen in Pasadena, Texas.