Water soluble ammonium polyphosphate (APP) developed in recent years is a new type of all-water soluble nitrogen and phosphorus fertilizer. APP's metal chelate and efficient fertilizer has strong economic and practical value, although it has not been widely used in China. In particular, the ability of chelate metal ions with water soluble ammonium phosphate can make APP play a more effective function. One of the pillar industries in Yunnan, Yuntianhua Co., Ltd. produce high concentrations of phosphate and c...
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