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 fertilizer use 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!