Simple identification method of phosphate fertilizer

First, identify from the package 1. Check the mark. The product name, nutrient content, grade, trademark, net weight, standard code, factory name, factory address, production license number and other signs must be indicated on the fertilizer packaging bag. 2. Check the bag seal. Special attention should be paid to chemical fertilizers with obvious unsealing marks on the packaging bag closure. This fertilizer may be adulterated.
Second, from the shape and color identification 1. Urea: white or light yellow, granular, needle-like or prismatic crystal. 2. Ammonium sulfate: white crystals. 3. Superphosphate: It is an off-white or light-skinned powder. 4. Heavy superphosphate: dark gray, off-white particles or powder. 5. Calcium magnesium phosphate: It is a taupe or dark green powder. 6. Potassium sulfate; white crystal or powder. 7 Potassium chloride: white or light red particles. 8. Monoammonium phosphate: grayish white or dark gray particles. 9. Diammonium phosphate: white or light yellow particles.
3. Identification from odor The fine particles with obvious pungent ammonia smell are ammonium bicarbonate. The sour fine powder is heavy superphosphate, and the special odor is lime nitrogen. If the superphosphate has a very pungent and sour taste, it means that waste sulfuric acid is likely to be used in the production process, which is very easy to damage or burn the crop.
4. Add 1 g of chemical fertilizer by adding water to the identification method. Put it in a clean glass or white porcelain bowl, add 10 mg of distilled water (or clean cold water), shake it thoroughly, and see the dissolved condition. All dissolved nitrogen fertilizer or Potassium fertilizer, soluble in water but with residue is superphosphate; soluble in water without residue or residue is heavy superphosphate; dissolved in water but with greater ammonia smell is ammonium bicarbonate.
5. Burning identification method Take a small spoonful of chemical fertilizer on the red charcoal, burn it violently, observe the situation carefully, smoke and catch fire, ammonia smell is ammonium nitrate; explosion, no ammonia smell is potassium chloride No violent reaction, ammonia and ammonium chloride are the ammonia smell; phosphate rock is added to the ammonium sulfate without ammonia smell.

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