First, identify from the packaging:
1. Check the mark. The relevant state departments stipulate that 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; if the above marks are not or incomplete, it may be false. Fertilizer or inferior fertilizer.
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, in the form of particles, needles or prismatic crystals. 2. Ammonium sulfate: white crystal. 3, ammonium bicarbonate: white or other variegated powder or granular crystal, individual manufacturers produce large particles of spheroidal ammonium bicarbonate. 4. Ammonium chloride: white or light yellow crystal. 5. Ammonium nitrate: white powdery crystal or white, light yellow spherical city particles. 6. Ammonia: It is a colorless or dark liquid. 7. Lime nitrogen: It is a grayish black powder. 8. Superphosphate: It is an off-white or light-skinned powder. 9. Heavy superphosphate: dark gray, off-white particles or powder. 10, calcium magnesium phosphate fertilizer: taupe or dark green powder. 11. Calcium, magnesium, phosphorus and potassium fertilizer: taupe or dark green powder. 12. Phosphate powder: It is gray, brown or yellow fine rain powder. 13, nitrophosphate: gray-white particles. 14. Potassium sulfate; white crystal or powder. 15. Potassium chloride: white or light red particles. 16. Monoammonium phosphate: It is an off-white or dark gray granule. 17. Diammonium phosphate: white or light yellow particles.
3. Identification from odor: The liquid with strong pungent ammonia smell is ammonia water; the fine granule with obvious pungent ammonia smell is 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. This inferior chemical fertilizer is highly toxic and can easily damage or burn the crop.
4. Add water to dissolve the identification method: Take 1 g of chemical fertilizer, put it in a clean glass tube (or glass, white porcelain bowl), add 10 mg of distilled water (or clean cold water), shake it thoroughly to see its dissolution. All dissolved in nitrogen or potassium fertilizer, soluble in water but with residue is superphosphate; soluble in water without residue or residue is heavy superphosphate; soluble in water but with greater ammonia smell is ammonium bicarbonate ; insoluble in water, but there is a bubble of chlorine and the smell of calcium carbide is lime nitrogen.
5. Burning identification method: Take a small spoonful of chemical fertilizer on the charcoal red burning, burn it violently, observe the situation carefully, smoke and catch fire, ammonia smell is ammonium nitrate; explosion, ammonia-free chlorination Potassium; no violent reaction, ammonia and ammonium chloride; ammonia sulfate and phosphate-free powder.
6. Qualitative identification of the test: When identifying the superphosphate and calcium magnesium phosphate fertilizer, the two fertilizers are taken out a little, dissolved in a small amount of distilled water, and identified by a wide pH test paper. The acidity is superphosphate, and the neutral is calcium and magnesium. Phosphate fertilizer.
When potassium chloride or potassium sulfate is identified, a 5% barium chloride solution may be added to produce a white precipitate of potassium sulfate; when 1% silver nitrate is added, a white floc is produced as potassium chloride.
The last thing to remind is that some fertilizers are true, but the content is very low, such as superphosphate, the effective phosphorus content is less than 8% (the minimum standard should be 12%), it is inferior fertilizer, and it has little effect on crops. If this happens, you can collect some samples (about 500 grams) and send them to the local agricultural, chemical or standard departments for identification.
1. Check the mark. The relevant state departments stipulate that 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; if the above marks are not or incomplete, it may be false. Fertilizer or inferior fertilizer.
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, in the form of particles, needles or prismatic crystals. 2. Ammonium sulfate: white crystal. 3, ammonium bicarbonate: white or other variegated powder or granular crystal, individual manufacturers produce large particles of spheroidal ammonium bicarbonate. 4. Ammonium chloride: white or light yellow crystal. 5. Ammonium nitrate: white powdery crystal or white, light yellow spherical city particles. 6. Ammonia: It is a colorless or dark liquid. 7. Lime nitrogen: It is a grayish black powder. 8. Superphosphate: It is an off-white or light-skinned powder. 9. Heavy superphosphate: dark gray, off-white particles or powder. 10, calcium magnesium phosphate fertilizer: taupe or dark green powder. 11. Calcium, magnesium, phosphorus and potassium fertilizer: taupe or dark green powder. 12. Phosphate powder: It is gray, brown or yellow fine rain powder. 13, nitrophosphate: gray-white particles. 14. Potassium sulfate; white crystal or powder. 15. Potassium chloride: white or light red particles. 16. Monoammonium phosphate: It is an off-white or dark gray granule. 17. Diammonium phosphate: white or light yellow particles.
3. Identification from odor: The liquid with strong pungent ammonia smell is ammonia water; the fine granule with obvious pungent ammonia smell is 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. This inferior chemical fertilizer is highly toxic and can easily damage or burn the crop.
4. Add water to dissolve the identification method: Take 1 g of chemical fertilizer, put it in a clean glass tube (or glass, white porcelain bowl), add 10 mg of distilled water (or clean cold water), shake it thoroughly to see its dissolution. All dissolved in nitrogen or potassium fertilizer, soluble in water but with residue is superphosphate; soluble in water without residue or residue is heavy superphosphate; soluble in water but with greater ammonia smell is ammonium bicarbonate ; insoluble in water, but there is a bubble of chlorine and the smell of calcium carbide is lime nitrogen.
5. Burning identification method: Take a small spoonful of chemical fertilizer on the charcoal red burning, burn it violently, observe the situation carefully, smoke and catch fire, ammonia smell is ammonium nitrate; explosion, ammonia-free chlorination Potassium; no violent reaction, ammonia and ammonium chloride; ammonia sulfate and phosphate-free powder.
6. Qualitative identification of the test: When identifying the superphosphate and calcium magnesium phosphate fertilizer, the two fertilizers are taken out a little, dissolved in a small amount of distilled water, and identified by a wide pH test paper. The acidity is superphosphate, and the neutral is calcium and magnesium. Phosphate fertilizer.
When potassium chloride or potassium sulfate is identified, a 5% barium chloride solution may be added to produce a white precipitate of potassium sulfate; when 1% silver nitrate is added, a white floc is produced as potassium chloride.
The last thing to remind is that some fertilizers are true, but the content is very low, such as superphosphate, the effective phosphorus content is less than 8% (the minimum standard should be 12%), it is inferior fertilizer, and it has little effect on crops. If this happens, you can collect some samples (about 500 grams) and send them to the local agricultural, chemical or standard departments for identification.
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