How to identify the authenticity of fertilizers

As the saying goes, "people are mistaken for a time, land is wrong for a year." Once farmers buy and use fake chemical fertilizers, the losses caused will be difficult to make up, which not only affects the enthusiasm of farmers, but also harms the interests of farmers. The following is to introduce the common identification methods of genuine and fake fertilizers: first of all, look at the packaging of fertilizers. Fertilizer bags must be marked with product name, nutrient content (grade), trademark, net weight, standard code, factory name and address, contact telephone number, production license number and fertilizer registration number, etc., if the above marks are not complete or incomplete, the packaging is rough, may be fake and shoddy compound fertilizer Special attention should be paid to fertilizers with obvious opening marks on the sealing of the bags. this phenomenon may be adulterated. In addition, pay attention to the production date on the production certificate in the fertilizer bag. If the fertilizer is stored for too long, the total nutrients will be lost. Second, look at the particle size (or crystallization state) of the fertilizer. The particle size and specific gravity of high-quality fertilizer are uniform, the surface is smooth, not easy to absorb moisture and caking, while the fake fertilizer is just the opposite, the particle size is uneven, the surface is rough, the humidity is high, and it is easy to caking. Third, look at the color of the fertilizer. The color of high-quality fertilizer is very uniform, there is no obvious color difference, and the whole particle is uniform from the inside to the outside. On the other hand, most of the fake fertilizers are surface painted and easy to decolorize. If you touch a handful of fertilizer and hold it hard for several times, the quality of "oil wet" is relatively reliable. The dry ones are likely to be shoddy fertilizers. Dissolve the fertilizer particles in a small amount of water, and after a period of time, it can be judged according to the dissolution of the fertilizer. The fertilizer particles of good quality will absorb water, expand and dissolve, and after shock, there will be almost no residue. On the other hand, the solubility of fake fertilizer is contrary to the above situation, poor solubility and residue phenomenon. The burning method is one of the simple methods to judge the true and false fertilizers and to distinguish the concentration. The fertilizer particles are heated or burned to identify the advantages and disadvantages of fertilizer from melting, smoke, smoke smell and residue. After heating, the fertilizer will bubble, melt, smoke, and give off the smell of ammonia, the particles become smaller, the higher the concentration, the less the residue. High-quality and high-concentration fertilizer burns completely and there is almost no residue. On the contrary, those that cannot burn or do not have the smell of ammonia are likely to be fake fertilizers.