Identification from the packaging:

1. Inspection marks Relevant national departments stipulate that the product name, nutrient content, grade, trademark, net weight, standard code, and Factory name, factory address, production license number and other signs; the absence or completeness of the above signs may be fake or inferior fertilizers

2. Check the seal of the packaging bag. Pay special attention to the type of fertilizer if there are obvious signs of unpacking on the seal of the packaging bag. Fertilizers can be adulterated

2. Identification based on shape and color:

1. Urea: white or light yellow in granular, needle-like or prismatic crystals 2. Ammonium sulfate : white crystals 3. Ammonium bicarbonate: white or variegated powder or granular crystals. The manufacturer produces large particles of oblate spherical ammonium bicarbonate 4. Ammonium chloride: white or light yellow crystals 5. Ammonium nitrate: white powder Crystal or white, light yellow ball particles 6. Ammonia: colorless or dark liquid 7. Lime nitrogen: gray-black powder 8. Superphosphate: gray-white or light-skinned powder 9. Heavy superphosphate: dark gray, gray-white particles or powder 10. Calcium magnesium phosphate fertilizer: gray brown or dark green powder 11. Calcium magnesium phosphate potassium fertilizer: gray brown or dark green powder 12. Phosphate rock powder: gray, brown or yellow drizzle powder 13. Nitric acid phosphate fertilizer: gray white particles 14 , Potassium sulfate: white crystal or powder 15. Potassium chloride: white or light red particles 16. Ammonium phosphate: off-white or dark gray particles 17. Diammonium phosphate: white or light yellow particles

3. From Odor identification:

Liquid ammonia has a strong pungent ammonia smell; fine-grained ammonium bicarbonate has a sour smell; fine powder heavy superphosphate has a special fishy smell; lime nitrogen has a distinct pungent ammonia smell

Superphosphate has a pungent and sour smell, which means that waste sulfuric acid and inferior chemical fertilizers were used in the production process, which is highly toxic and can easily damage or burn crops

IV. Identification method by adding water to dissolve:

Take 1 gram of fertilizer and put it in a clean glass tube (or glass and white porcelain bowl). Add 10 mg of distilled water (or clean cold boiled water) and shake it thoroughly to see if it dissolves. All nitrogen fertilizers or potassium fertilizers will be dissolved; superphosphate will have residue when dissolved in water. ; Soluble in water, there is no residue or little residue; double superphosphate; Soluble in water, it has a strong ammonia smell; ammonium bicarbonate; Soluble in water, it produces bubbles and has the smell of calcium carbide, chlorine, lime nitrogen

5. Burning Identification method:

Take a small spoonful of chemical fertilizer and put it on the red charcoal and burn it violently. Observe the situation carefully. If there is smoke and fire, there will be ammonium nitrate that smells like ammonia; there will be no ammonia smell like potassium chloride; there will be no violent reaction and there will be ammonia smell like urea. and ammonium chloride; add some ammonium sulfate without ammonia smell phosphate rock powder

6. Qualitative laboratory identification:

When identifying superphosphate and calcium magnesium phosphate fertilizer, take out a little dissolved In a small amount of distilled water, use pH test paper to identify acidic superphosphate and calcium magnesium phosphate fertilizer

When identifying potassium chloride or potassium sulfate, adding 5 barium chloride solution will produce white precipitated potassium sulfate; when adding 1 silver nitrate Produces white flocs of potassium chloride

It is necessary to remind that although the content of some fertilizers is low, the effective phosphorus content of superphosphate is less than 8 (the low standard should be 12), which is an inferior chemical fertilizer that has great fertilizer effect on crops. Collect some samples (about 500 grams) and send them to the relevant local agriculture, chemical industry or standards departments for identification