BorrePlex™ OA is a mixture of calcium lignosulfonate and lignosulfonic acid and can act as a chelating agent for micronutrients. BorrePlex OA is a modified organic acid derived from lignin, a nature-based and renewable raw material that contains carbon and sugars. This product acidifies irrigation water, improves water penetration, helps free up bound nutrients in alkaline soil, and supplies carbon to soil microorganisms. BorrePlex™ OA is a trademark owned by Borregaard AS.