Farming is just around the corner. It is the peak period of agricultural product sales and farmers purchasing agricultural materials. Scientifically purchasing fertilizers is crucial for achieving high crop yields. How to purchase high-quality fertilizer to achieve low-cost and high-efficiency fertilization purposes, the farmers are still difficult to master, coupled with the variety of compound fertilizers on the market, novel names, packaging fancy, increasing the difficulty of identification. How can we let farmers friends buy reassuring fertilizers? In response to this problem, the experts of the Municipal Agricultural Technology Promotion Center reminded farmers of some relevant knowledge to pay attention to when purchasing fertilizer.
The first is how to buy urea, phosphate and potash. First, the package inspection. Products produced by regular manufacturers shall be marked with the “Three Certificates†on the packaging bag, ie the production license number, the agricultural use registration certificate number and the implemented quality standard number (GB15063-2001), etc., which must be inspected. The outer packaging of the general fertilizer is a woven bag, the inner packaging is a plastic bag, the packaging bag is machine-stitched, and the seams should be neat and uniform. The national regulations stipulate that the trademark, fertilizer name, manufacturer, fertilizer composition (indicating nitrogen, phosphorus, potassium content and trace element content), product net weight and standard code should be marked on the packaging bag. Each batch of products will be accompanied by a quality certificate. . Superphosphate has bulk products, but it also comes with a factory certificate. Second, the appearance test of the fertilizer. 1. Look at it. Fertilizer granules have good luster, bright colors are high-quality chemical fertilizers, and gray and dull are inferior fertilizers. 2. Handcuffs. The palm of your hand is put on the fertilizer, and it is twisted twice. It is not broken into high-quality fertilizer, broken into inferior fertilizer, and the harder the chemical is, the better. 3. Water soluble. Take a small amount of nitrogen fertilizer and potassium fertilizer into the water and stir for 5 minutes, which can be completely dissolved into high-quality chemical fertilizer, and can not be completely dissolved into inferior fertilizer. Diammonium phosphate can be dissolved in water, but the dissolution time is longer. 4. Fire. High-quality nitrogen fertilizer and phosphate fertilizer can be fired. The longer the melting time, the less the remaining impurities are. The shorter the melting time and the worse the residual impurities. Urea can be burned with fire, and white smoke is emitted when the temperature is high. Diammonium can be burned by fire, and the longer the melting, the better. The compound fertilizer can be burned by fire, and the longer the melting time, the better. The quality of phosphate fertilizer and compound fertilizer is not bad. 5. Potassium fertilizer. There are white, red, pink, red potassium fertilizer is generally imported potassium fertilizer, the best quality, potassium fertilizer tastes with tongue, spicy taste is high quality compound fertilizer, spicy taste is inferior compound fertilizer. The compound fertilizer tastes spicy with the tongue, indicating that it contains potassium. 6. BB fertilizer. It is made by blending large granular urea, diammonium phosphate and potassium parent fertilizer. The urea and potassium parent fertilizer can be opened by water. The diammonium phosphate is dissolved in water for a long time, but it can be opened. In addition, the diammonium phosphate can be burned by fire. . Third, when purchasing fertilizer, you must leave a receipt and relevant ticket, so that you can make a voucher claim when there is a problem. Ensure your legal rights and interests.
The second is how to choose compound fertilizer. The variety of compound fertilizers sold on the market is now complicated, the name is novel, and the packaging is fancy, which increases the difficulty of identification. The first is to master the production of compound fertilizer, which has a guiding role in the selection of compound fertilizer. According to the production process, it can be divided into compound fertilizer, compound fertilizer and BB fertilizer (blended fertilizer). Compound fertilizer refers to the fertilizers made by chemical methods, among the three nutrients of nitrogen, phosphorus and potassium, at least two kinds of nutrients; the compound fertilizer refers to at least two of the three nutrients of nitrogen, phosphorus and potassium. A nutrient prepared by chemical methods and/or blending methods; BB fertilizer (blended fertilizer) refers to a fertilizer that is directly blended with large particles of nitrogen, phosphorus and potassium fertilizers. The second is to master the classification criteria of high, medium and low concentration of compound fertilizer. It is a necessary common sense to purchase compound fertilizer. Another important indicator is the content of effective nutrients. The effective nutrients can only be marked by NPK (N+P2O5+K2O), and other nutrients are not used as nutrient markers (GB15063-94 standard). Effective nutrient ≥ 40% is high concentration compound fertilizer, effective nutrients 30% to 40% for medium concentration, and effective nutrients 25% to 30% for low concentration. The minimum nutrient standard for three-element compound fertilizer is ≥25%, 20% to 25% can only produce two-element compound fertilizer, and less than 20% is not allowed for production in the country. The third is to choose the compound fertilizer can not only rely on the appearance, particle, color, solubility judgment, but also pay attention to the brand effect. Brands are the product of market competition, and excellent products have a recognized market effect. At present, in order to cater to the unscrupulous requirements of some dealers, some small enterprises in China are not able to impersonate the appearance of brand-name products or imported products with inferior goods, and they have seriously harmed the legitimate interests of farmers and should be vigilant. The fourth is to choose compound fertilizer and choose fertilizer. For soils with slightly alkaline and organic matter content (the soil pH is generally around 8) and effective nitrogen and phosphorus deficiency according to soil properties, acidic compound fertilizers such as monoammonium phosphate or humic acid NPK should be used. Fertilizer, nitrogen and phosphorus compound fertilizer is appropriate. However, alkaline compound fertilizers such as diammonium phosphate should be used for acidic soils.
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