Bulagric ltd. Bul. Bulgaria 45 , Sofia , Sofia Bulgaria About Solutions products Companies Bulagric ltd. Products Urea - Urea Ammonium Nitrate Urea - Urea Ammonium Nitrate 0 Share UAN is ammonium nitrate and urea in water and it is used as a fertilizer. This is one combination that has very low critical relativehumidity at 18%. This is what makes it onlyusable in the liquid state. Most popular related searches ammonium nitrate ammonium nitrate fertilizer nitrate fertilizer Customer reviews No reviews were found for Urea - Urea Ammonium Nitrate. Be the first to review! Add your review Publish your review Great! review successfully added!