In order to enable farmers' friends to select good fertilizers and prevent them from being deceived, several simple methods for identifying fertilizers are introduced to facilitate the mastery and application. Summarized into five words "see, touch, smell, burn, dissolve."
1, see: a look at fertilizer packaging. According to the regulations of relevant departments of the country, the chemical fertilizer packaging bag must indicate the product name, nutrient content, grade, trademark, net weight, standard code, factory name, site, production license number, etc. If the above identification is not complete or incomplete, it may be Fake fertilizer or poor fertilizer. In addition, special attention should be paid to chemical fertilizers that have obvious sealing and sealing marks on the bags, and this fertilizer may be adulterated. Second, look at the particle size of the fertilizer. Nitrogenous fertilizers and potassium fertilizers are mostly crystals; high-quality compound fertilizers have uniform grain size and specific gravity, and have a smooth surface that is not easy to absorb moisture and agglomerate. The opposite is true of counterfeit fertilizers, fertilizers are uneven in size, rough, high humidity, easy to agglomerate. Three to see the color of fertilizer. Different fertilizers have their own unique colors. N fertilizers are almost all white, some are slightly yellow-brown or light blue (except for the addition of other ingredients); potash is white or slightly reddish, and potassium dihydrogen phosphate is white.
2, touch: the fertilizer on the palm of your hand, press hard to hold or press, according to feel to determine the fertilizer. Using this method, it is more effective to discriminate diammonium phosphate, grasping a handful of fertilizers and holding it a few times. There is a sense of “oiliness†and it is a genuine product; and when it is dried, it is likely to be used as a compound fertilizer to pour diammonium.
3, smell: Simple judgement through the special smell of fertilizer. Ammonium bicarbonate, for example, has a strong ammonia odor, which is the kind of piercing and blinking taste in public toilets in the summer; ammonium sulfate is slightly sour; calcium superphosphate is sour. The smell of counterfeit fertilizer is not obvious.
4. Burning: The chemical fertilizer sample is heated or burned, and the fertilizer is identified from the flame color, melting condition, smoke taste, residue condition and the like. For example, ammonium bicarbonate of nitrogen fertilizer directly decomposes, a large amount of white smoke occurs, there is a strong ammonia smell, and there is no residue; urea can quickly melt and emit white smoke, and it can be burned by being thrown into charcoal fire, when it is contacted with glass flue, it can be See glass plate with a layer of white crystals.
5, dissolved: The fertilizer particles into a bottle of water with a small amount of water, after a period of time, according to the dissolution of fertilizers to determine. Such as ammonium nitrate, diammonium phosphate, potassium sulfate, potassium chloride, etc. can be completely dissolved (chemical), superphosphate, calcium superphosphate, calcium ammonium nitrate and other parts dissolved; compound fertilizer particles will be dispersed, dissolved or have a little residue , And fake fertilizers are poorly soluble or do not dissolve at all.
The last thing to be reminded is that although some fertilizers are real, but their content is very low, such as superphosphate, the mark of available phosphorus content is 8%, and the national minimum standard should reach 12%, it belongs to inferior fertilizer and has little effect on crops. . If this happens, some samples (about a pound) can be collected and sent to the relevant department for identification.
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