Although the quality of fertilizers, especially the nutrient content, is difficult to distinguish, if you remember the words “look, touch, smell, burn, dissolve†when purchasing fertilizer, you can reduce deception and misconduct.
Look at the packaging. The product name, nutrient content, trademark, net weight, standard code, factory name, factory address, production license number, and fertilizer registration certificate number must be indicated on the package of commercial fertilizer. If the above mark is not or incomplete, it may be fake fertilizer. Look at the seal. Special attention should be paid to fertilizers with obvious unsealing marks on the bag closure. This fertilizer may be adulterated. Look at the shape. Nitrogen fertilizer (except lime nitrogen) and potassium fertilizer are mostly crystalline. Phosphate fertilizer is mostly agglomerate or powdery amorphous, calcium magnesium phosphate fertilizer is powdery, and superphosphate is mostly porous. The compound fertilizer has relatively uniform particle size, smooth surface, and is not easy to absorb moisture and agglomerate. In the case of fertilizer with uneven particle size, roughness, high humidity and easy agglomeration, the compound fertilizer can be judged to be false. Look at the color. Different fertilizers have their own unique colors. The nitrogen fertilizer is almost all white except for lime nitrogen, some are slightly yellowish brown or light blue (except for adding other ingredients); potassium fertilizer is white or slightly reddish, such as potassium dihydrogen phosphate is white; Phosphate fertilizer is mostly dark gray, such as superphosphate, calcium magnesium phosphate is gray, diammonium phosphate is brown, etc., farmers can make a rough distinction.
Touch the fertilizer on the palm of your hand, hold it firmly or press it to change the fertilizer according to your hand. Using this method, it is more effective to discriminate the diammonium in the United States. Grasp a handful of fertilizer and hold it several times. The "oily wet" feeling and smooth surface should be true. The dry and rough surface is mostly fake and inferior fertilizer.
Sniffing is judged simply by the special smell of the fertilizer. For example, ammonium bicarbonate has a strong ammonia odor; ammonium sulfate is slightly sour; superphosphate has a sour taste, and counterfeit is not obvious; but superphosphate uses waste sulfuric acid in the production process, which produces strong pungent The strange sour taste, this fertilizer is very toxic, it is very easy to damage or burn crops.
The fertilizer is heated or burned to identify the fertilizer from the color of the flame, the melting condition, the smell of the smoke, the residue, and the like.
Nitrogen fertilizer, ammonium bicarbonate, direct decomposition, a large amount of white smoke, strong ammonia smell, no residue; ammonium chloride, direct decomposition or sublimation, a large amount of white smoke, strong ammonia and sour taste, no residue; urea It can melt quickly, emit white smoke, burn in charcoal fire, or take a piece of glass to contact white smoke. It can be seen with a layer of white crystal on the glass piece. Ammonium nitrate does not burn but melts and appears to be boiling. A cigarette with ammonia smell.
Phosphate superphosphate, calcium magnesium phosphate, phosphate rock powder, etc. have no change on red charcoal; bone powder quickly turns black, and gives off burnt smell.
Potassium fertilizer potassium sulfate, potassium chloride, potassium magnesium sulfate, etc. did not change on the red charcoal, and made a loud noise.
The combustion of compound fertilizer is closely related to its constituent materials. When there is ammonia nitrogen or amido nitrogen in the raw material, it will emit strong ammonia smell and a large amount of residue.
Dissolve the fertilizer and dissolve it in water. Take 1 gram of chemical fertilizer, put it in a clean glass tube and other utensils, add 10 mg of distilled water (or clean cold water), shake it thoroughly to see its dissolution. Nitrogen and potassium fertilizers are all dissolved. If turbidity is present, it is fake and inferior fertilizer; calcium superphosphate is soluble in water and has residue; heavy superphosphate is soluble in water without residue or residue; it is soluble in water but has a large ammonia smell. It is ammonium bicarbonate; lime nitrogen is insoluble in water, and bubbles are generated and have a chlorine smell of calcium carbide.
It should be noted that although some fertilizers are true, the effective nutrient content is not up to standard or very low. If this happens, you should go to the local fertilizer department to complain, collect or retain some samples, and purchase fertilizer invoices, etc. Relevant notes provide the necessary evidence to protect their legitimate rights and interests.
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