No. Liuguo diammonium is a high-quality, high-concentration chemical fertilizer that contains sulfur, magnesium, calcium, iron, zinc and other trace elements necessary for crop growth. The main varieties of diammonium in the six countries are 57% diammonium and 61% diammonium. Among them, 57% of diammonium is an instant chemical fertilizer, which can be used as both base fertilizer and top dressing. 61% of diammonium is a slow-release chemical fertilizer and is mainly used as a base fertilizer. The content of diammonium in the six countries is between 57% and 61%, and there is no diammonium content of 51%. When purchasing chemical fertilizers, if you find abnormal diammonium content, you can report the situation to the relevant agencies to safeguard your legitimate rights and interests.