HGV sources the highest quality raw materials. We have tested every form of N (nitrogen), P (potassium), K (phosphorus), as well as secondary and trace elements, and only use what has given the best results time after time in our own commercial facilities. No Ammoniacal or Urea products are ever used. While we could make a lower-cost product, that is not our focus. Quality is always at the top of their list, and it should be at the top of yours as well.