1. Packaging identification method. First, the inspection mark, the relevant state departments stipulate that the fertilizer packaging must indicate the product name, nutrient content, grade, trademark, net weight, standard code, factory name, site, production license number, etc., if the above signs are not or not Complete, may be fake fertilizer or inferior fertilizer. The second is to check the sealing of the packaging bag. Special attention should be paid to the chemical fertilizer with obvious unsealing marks on the sealing of the packaging bag. This phenomenon may be adulterated.
2, burning identification method. Take a small spoonful of chemical fertilizer on the red charcoal, burn it violently, and observe the situation carefully. For example, the smoke is too large, the ammonia smell is ammonium nitrate; the explosion, the ammonia-free smell is potassium chloride; no violent reaction, The smell of ammonia is phosphate rock.
3. Qualitative identification method. When identifying superphosphate and calcium phosphate, remove the two fertilizers a little, dissolve in a small amount of distilled water, and identify with a wide range of pH test papers. Acidic is superphosphate, neutral is calcium phosphate; added 5% The ruthenium chloride solution produces a white precipitate which is potassium sulphate. When 10% nitrate is added, the white floc is produced as potassium chloride.
4, water soluble identification method. Take 1 gram of chemical fertilizer to be inspected, put it in a clean glass tube or glass, white porcelain bowl, add 10 ml of distilled water or clean cold water to shake well, see the dissolution, all dissolved nitrogen or potassium fertilizer; dissolved in water However, there is residue of superphosphate; dissolved in water without residue or residue is heavy over calcium phosphate; dissolved in water but has a greater ammonia smell is ammonium bicarbonate.
5. Odour identification method. It can also be identified by smelling. For example, the liquid with strong pungent smell is ammonia; the particles with obvious pungent ammonia smell are ammonium bicarbonate; the sour fine powder is heavy superphosphate, such as superphosphate. The pungent and sour taste indicates that waste sulfuric acid is likely to be used in the production process. This chemical fertilizer is highly toxic and can easily damage or burn crops, especially rice ponds cannot be used.
6, shape identification method. 1 Urea is white or egg yellow, in the form of granules, needle-like or prismatic crystals. 2 Ammonium sulfate is a white crystal. 3 Ammonium bicarbonate is white or other variegated powder or granular crystals. 4 Ammonium chloride is white or light yellow crystal. 5 Ammonium nitrate is a white powder crystal or white, light yellow spherical particles. 6 Ammonia is a colorless or dark liquid. 7 Lime nitrogen is a grayish black powder. 8 Superphosphate is an off-white or light-skinned powder. 9 Heavy superphosphate is dark gray, grayish white or powdery. 10 Calcium phosphate is a taupe or dark green powder. 11 Calcium, magnesium, phosphorus and potassium fertilizers are taupe or dark green powder. 12 Phosphate powder is gray, brown or yellow fine powder. 13 Phosphate fertilizer is white particles. 14 Potassium sulfate is a white crystal or powder. 15 Potassium chloride is white or light red particles. 16 monoammonium phosphate is grayish white or dark gray particles. 17 Diammonium phosphate is white or light yellow granules. 18 Ammonium phosphate fertilizer is an off-white or dark gray granule. In addition, in the production practice, farmers still have some real and fake fertilizer identification methods.
It should be pointed out that some fertilizers are true, but the content is low. For example, the minimum standard of effective phosphorus content of superphosphate should be 12%, while some content is only a few percent, even 10% can not be reached. Fertilizer, such as compound fertilizer, nitrogen, phosphorus, potassium content of 15% each, can not reach the test, it is inferior fertilizer, the crop fertilizer effect is not large, can not meet the needs of nutrients in the crop growth period.
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