Agro-K’s Potassium Dextro-Lac®, a foliar macronutrient, is derived from potassium carbonate. A series of proprietary manufacturing processes are used to separate the potassium from the carbonate molecule and link it to a polysaccharide molecule creating a nutrient product linked to a sugar base. The term Dextro-Lac® is used to convey the process and resulting product.