First, the appearance of identification Pu-calcium is a dark gray or gray-white loose powder with sour taste. Phosphogypsum is a gray hexagonal column or crystalline powder with no sour taste. The calcium magnesium phosphate fertilizer is grayish green or grayish brown, has no sour taste, and is rarely dried glassy fines or fine powders. Second, hand feel Pu-Cao feels hair but not frivolous, and the phosphogypsum feels dry and feels dry. Third, water-soluble identification Phosphate nitrate, diammonium phosphate and calcium superphosphate are insoluble in water, normal calcium is partially soluble in water, phosphogypsum is completely soluble in water, calcium magnesium phosphate is insoluble in water. Four, color identification In the absence of moisture, the diammonium phosphate has a dark brown center and a slightly yellowish edge. The outer edges of the particles are slightly translucent, and the surface is slightly smooth and irregular. The color of the diammonium phosphate was darkened after being dampened, and there was no yellowishness and edge transparency. After the wet water, a small amount of powdery white appeared. Nitrate phosphate has no obvious transparent sensation, and the surface of the granules is smooth. It is a dark brown irregular granule. Heavy calcium phosphate particles are dark gray particles. The superphosphate color is lighter, grayish or light grey, and the surface smoothness is somewhat poor. Fifth, fire identification Phosphate diammonium phosphate and nitrophosphate fertilizers rapidly liquefy on red charcoal and evolve ammonia gas, and heavy superphosphate and superphosphate do not have ammonia odor, especially the shape of superphosphate particles does not change. Natural Prebiotic Soluble Dietary Fiber,Prebiotics Fructo-Oligosachharide,High Quality Fructo-Oligosaccharide Shandong Bailong Chuangyuan Bio-tech Co.,Ltd. Qingdao Branch , http://www.sdblcycn.com