First look at fertilizer packaging. Fertilizers produced by regular manufacturers have firm external packaging specifications and are printed with trademarks, product names, nutrients, net weights, factory names, addresses, etc. ; The packaging of fake and shoddy products is generally rough, the information on the packaging bag is unclear, the quality is poor, and it is easy to leak. Secondly, look at the granularity of fertilizer. Potassium fertilizer is mostly crystal; Phosphate is mostly amorphous in block or powder form, such as calcium magnesium phosphate in powder form and calcium superphosphate in porous block form. High-quality compound fertilizers, such as Russian ternary compound fertilizer and American diammonium, have uniform particle size and specific gravity, smooth surface and are not easy to absorb moisture and agglomerate. On the contrary, fake and shoddy fertilizers are uneven, rough, wet and easy to agglomerate.

Secondly, look at the color of fertilizer. Different fertilizers have their own unique colors. Nitrogen fertilizer is almost white except lime nitrogen, and some are slightly yellowish brown or light blue (except for other components). Potassium fertilizer is white or reddish, such as potassium dihydrogen phosphate is white; Phosphate fertilizers are mostly dark gray, such as superphosphate, calcium magnesium phosphate, diammonium phosphate, etc.

Second, put the fertilizer in the palm of your hand, hold it hard or press it to rotate, and judge the fertilizer according to the feel. In this way, American diamines can be distinguished more effectively. Grab a handful of fertilizer and hold it hard for a few times. It is genuine to feel "oil"; It's probably a flip-chip compound fertilizer fraud. In addition, the phosphorus fertilizer that fly ash pretends to be can also be judged simply by "feeling".

Third, sniffing can be judged simply by the special smell of fertilizer. For example, ammonium bicarbonate has a strong ammonia smell, ammonium sulfate has a slight sour taste, and calcium superphosphate has a sour taste. The smell of fake and shoddy fertilizers is not obvious.

4. The burning fertilizer sample is heated or burned, and the fertilizer is identified from the aspects of flame color, melting condition, smoke smell and residue.

Ammonium bicarbonate, directly decomposed, produces a lot of white smoke, with strong ammonia smell and no residue; Ammonium chloride, directly decomposed or sublimated, produces a lot of white smoke, which has a strong ammonia taste and sour taste, and has no residue; Urea can melt quickly, emit white smoke and burn in charcoal fire, or when the glass sheet contacts white smoke, you can see a layer of white crystals attached to the glass sheet; Ammonium nitrate does not burn but melts and boils, giving off smoke with ammonia smell.

Calcium superphosphate, calcium magnesium brick and phosphate rock powder have no change on red carbon; Bone meal soon turns black and gives off a burnt smell;

Potassium sulfate, potassium chloride, potassium magnesium sulfate, etc. Don't change on the red charcoal and make a crack.

The combustion of compound fertilizer is closely related to its raw materials. When there is ammonia nitrogen or amide nitrogen in its raw materials, it will give off a strong ammonia smell and have a lot of residues.

5. If it is difficult to identify the variety of chemical fertilizer by visual observation, it can also be distinguished according to its dissolution in water. Sprinkle fertilizer particles on the wet ground or moisten them with a little water. After a period of time, it can be judged according to the dissolution of fertilizer. For example, ammonium nitrate, hydrazine, potassium sulfate and potassium chloride can be completely dissolved, and calcium superphosphate, calcium superphosphate and calcium ammonium nitrate can be partially dissolved; Compound fertilizer particles will disperse, dissolve or have a little residue, while fake fertilizer has poor solubility or does not dissolve at all (except phosphate fertilizer)