Consultation: I bought the phosphate fertilizer, I feel the quality is wrong, how to easily identify?
Answer: First, identify from the packaging
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, distinguish from shape and color
1. Urea: white or light yellow, in the form of granules, needles or prismatic crystals. 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.
Third, identify from the smell
The fine particles with a pronounced pungent ammonia taste 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 the waste sulfuric acid is likely to be used in the production process, and the fertilizer is very easy to damage or burn the crop.
Fourth, adding water to dissolve identification method
Take 1 g of chemical fertilizer, 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 or potassium fertilizer, soluble in water but Residues are calcium superphosphate; those which are soluble in water without residue or residue are heavy superphosphate; those which are soluble in water but have a large ammonia smell are ammonium bicarbonate.
Five, 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, there is The ammonia smell is urea and ammonium chloride; the addition of ammonium sulfate without ammonia smell is phosphate rock powder.
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