All kinds of chemical fertilizers have a standardized logo, special external appearance and different physical and chemical properties. According to the identification of the fertilizer package and the observation of the appearance, the type of water and the true and false fertilizers can be preliminarily judged by the changes in the water-solubility, the addition of alkali, and the burning of the fire. However, to know whether the nutrient content meets product standards, it must be sampled and tested. In order to safeguard the interests of farmers and enhance self-protection awareness, the simple identification method of chemical fertilizers is introduced as follows.
First, the intuitive method
It mainly depends on the packaging, color, and smell of fertilizer products.
1. Packaging According to the standard of GB18382-2001: The product's packaging label is marked with the fertilizer name and trademark in Chinese; fertilizer specifications, grades and net content; nutrient content; other additives content; production license number and fertilizer registration certificate number; Implementation of the standard; manufacturer's name and address, telephone number; warning instructions. At the same time, the product instruction manual should be attached to the product bags, and the products used within the time limit should also indicate the production date and validity period.
Compound Fertilizer (Composite Fertilizer) National Standard GB15063-2001 "Compound Fertilizer (Composite Fertilizer)" is correctly identified as: trademark; compound fertilizer; total nutrient content N + P2O5 + K2O three elements of the sum of nutrient content); nitrogen, Single nutrient content of phosphorus, potassium (N, P2O5, K2O) three elements; product implementation standards; production license number; fertilizer registration certificate number; whether to contain chlorine (compound fertilizer without chlorine should be marked: potassium sulfate fertilizer) Net content; factory name, site, telephone; also prescribed compound fertilizer (compound fertilizer) minimum nutrient content of 25%. At present, misleading labels on compound fertilizer packaging bags mainly include: (1) any of the following: medium amount, trace element calcium (CaO), silicon (SiO2), magnesium (MgO), and sulfur (S); Several elements replace any of the three elements nitrogen (N), phosphorus (P2O5), and potassium (K2O). If the compound fertilizer that should be marked with nitrogen, phosphorus, potassium (N, P2O5, K2O) nutrient content is changed to nitrogen, phosphorus, sulfur [(N, P2O5, S) or (Si, Mg, Ca)], it is missing. The content of potassium deceives and misleads farmers. 2 The nitrogen, phosphorus, and potassium tri-element fertilizers were added together with medium and trace elements such as calcium, magnesium, silicon, sulfur, and trace elements such as zinc, boron, iron, manganese, molybdenum, and copper as total nutrient contents. 3 Mislead farmers by adding organic matter content as effective nutrient content with nitrogen, phosphorus and potassium nutrients.
Organic-inorganic compound fertilizer According to the national standard GB18877-2002, the organic content of organic-inorganic compound fertilizer is ≥20%, and the total nutrient content is N, P, K (N, P2O5, K2O) ≥15%. All organic-inorganic compound fertilizers that are lower than the above two indicators are all unqualified fertilizer products.
Organic Fertilizer Industry Standard NY525-2002 stipulates: organic matter content of organic fertilizer ≥ 30%; total nutrient content of nitrogen, phosphorus, potassium (N, P2O5, K2O) ≥ 4%. All organic fertilizers below the above two indicators are unqualified fertilizer products.
Foliar fertilizer foliar fertilizers should meet the following technical indicators: 1 Nutrient elements (N + P2O5 + K2O) soluble fertilizer ≥ 50%; 2 trace elements (Fe + Zn + B + Mo + Mn + Cu) foliar fertilizer ≥ 10%; Amino acid content in 3 amino acid foliar fertilizers ≥10%; 4 Humic acid in humic acid soluble fertilizers≥3% in total content.
Some will only contain 3% of calcium, magnesium and silicon with P2O5 as calcium, magnesium and silicon fertilizers. Farmers can easily mistake this fertilizer for calcium magnesium phosphate. Any product lacking product implementation standards, fertilizer registration certificate number, and production license number (referring to compound fertilizer, superphosphate, calcium magnesium phosphate fertilizer, calcium magnesium phosphate, potassium fertilizer) on the packaging shall be regarded as unlicensed products. Market sales.
Fertilizer products that do not have the fertilizer factory name, business address and telephone number on the packaging bag should be regarded as false and inferior fertilizer products.
2. The color of all nitrogen fertilizers is almost white, some are slightly brown or light blue. Potash has white (such as potassium sulfate, salt lake potassium) and red (such as potassium chloride in Canada, Russia, potassium chloride), potassium dihydrogen phosphate was white, calcium magnesium phosphate, calcium superphosphate gray.
3. Odor Ammonium bicarbonate has a strong ammonia smell, ammonium sulfate is slightly sour, and superphosphate has a sour taste. Hunan Soil and Fertilizer Work Station Liu Ruqing
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