Look at the packaging State regulations, the product name, nutrient content, grade, trademark, net weight, standard code, factory name, factory address, production license number, etc. must be indicated on the fertilizer packaging bag. In addition, it is necessary to check the sealing of the packaging bag. If the sealing has obvious unsealing marks, the fertilizer may be adulterated.
Look at the shape and color, such as urea is white or light yellow, in the form of granules, needles or prismatic crystals; ammonium bicarbonate is white or other variegated powder or granular crystal, there are also some manufacturers to produce large particles of spheroidal ammonium bicarbonate Ammonium sulphate is white crystal; ammonium chloride is white or light yellow crystal; superphosphate is grayish white or light skin powder; calcium magnesium phosphate is taupe or dark green powder; potassium sulphate is white crystal or powder; White or light red particles; monoammonium phosphate is grayish white or dark gray particles; diammonium phosphate is white or light yellow particles.
Smell The liquid with strong pungent ammonia smell is ammonia; the fine granule with obvious pungent ammonia smell is ammonium bicarbonate; the sour fine powder is heavy superphosphate; 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.
Add water to identify 1 g of chemical fertilizer and put it in the vessel and shake it thoroughly. All dissolved nitrogen or potassium fertilizer. Dissolved in water but with residue is superphosphate. Dissolved in water without residue or residue is heavy superphosphate. Dissolved in water but with a large ammonia smell is ammonium bicarbonate.
Add a small spoonful of chemical fertilizer to the burnt red charcoal, burn it violently, observe the situation carefully, smoke and catch fire, ammonia smell is ammonium nitrate; explosion, no ammonia smell is potassium chloride; no sharp The reaction, ammonia smell is urea and ammonium chloride.
Finally, it should be reminded that some fertilizers are true, but the nutrient content is very low, such as superphosphate, the effective phosphorus content is less than 8% (the minimum standard should reach 12%), it is inferior fertilizer, and the fertilizer effect is not great. In this case, some samples (about 500 grams) can be collected and sent to local agricultural, chemical or standard departments for identification.
Look at the shape and color, such as urea is white or light yellow, in the form of granules, needles or prismatic crystals; ammonium bicarbonate is white or other variegated powder or granular crystal, there are also some manufacturers to produce large particles of spheroidal ammonium bicarbonate Ammonium sulphate is white crystal; ammonium chloride is white or light yellow crystal; superphosphate is grayish white or light skin powder; calcium magnesium phosphate is taupe or dark green powder; potassium sulphate is white crystal or powder; White or light red particles; monoammonium phosphate is grayish white or dark gray particles; diammonium phosphate is white or light yellow particles.
Smell The liquid with strong pungent ammonia smell is ammonia; the fine granule with obvious pungent ammonia smell is ammonium bicarbonate; the sour fine powder is heavy superphosphate; 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.
Add water to identify 1 g of chemical fertilizer and put it in the vessel and shake it thoroughly. All dissolved nitrogen or potassium fertilizer. Dissolved in water but with residue is superphosphate. Dissolved in water without residue or residue is heavy superphosphate. Dissolved in water but with a large ammonia smell is ammonium bicarbonate.
Add a small spoonful of chemical fertilizer to the burnt red charcoal, burn it violently, observe the situation carefully, smoke and catch fire, ammonia smell is ammonium nitrate; explosion, no ammonia smell is potassium chloride; no sharp The reaction, ammonia smell is urea and ammonium chloride.
Finally, it should be reminded that some fertilizers are true, but the nutrient content is very low, such as superphosphate, the effective phosphorus content is less than 8% (the minimum standard should reach 12%), it is inferior fertilizer, and the fertilizer effect is not great. In this case, some samples (about 500 grams) can be collected and sent to local agricultural, chemical or standard departments for identification.
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