In the autumn, the agricultural capital market gradually began to purchase fertilizers. How to identify fake fertilizers through appearance? Yuege Fertilizer Network said that the chemical fertilizer produced by regular manufacturers is marked with the name of the fertilizer, the content of the main ingredients, the standard code, the name of the factory and the site. It is accompanied by a factory inspection certificate. If the packaging mark is not clear, or three no (no factory name, product license or registration certificate, product certificate) fertilizer, it is very likely to be counterfeit and shoddy products, the majority of farmers must pay attention.
In recent years, some manufacturers and a few lawless elements have ignored the interests of the state and the vast number of consumers, and used the means of deceitful camouflage to manufacture and sell fake deterioration fertilizer. In this case, because there are many types of fertilizers, their characteristics are different, and the number of nutrients contained is different. From the outside, some fertilizers are very similar and difficult to distinguish.
If the fertilizer is applied erroneously, it will cause very serious adverse consequences. Therefore, it is necessary to learn some basic knowledge of chemical fertilizers, understand and master the nature and identification methods of chemical fertilizers.
We can identify fertilizers from the following aspects:
- Identification from the appearance, such as the appearance of nitrogen fertilizer is generally white or light yellow crystal, potassium fertilizer is white or meat red crystal, are slightly hygroscopic;
- Identification from the reaction or solubility of chemical fertilizers in water;
- It is identified by the burning reaction. Generally, the chemical fertilizer has some changes through the burning, such as emitting odor;
- It is identified by the phenomenon that the chemical fertilizer reacts in alkali solution, such as releasing ammonia odor, and precipitation occurs.
In order to enable the masses of farmers to have a systematic understanding of the nature and identification methods of common fertilizers and easy access, the identification methods of various common fertilizers are listed below:
Urea: The appearance of urea is white, spherical particles, total nitrogen content ≥ 46, 0%, easy to absorb moisture, and hygroscopicity is between ammonium sulfate and ammonium nitrate. Urea is easily soluble in water and liquid ammonia. When pure urea is heated to near the melting point under normal pressure, it begins to show instability, produces a condensation reaction, and produces biuret, which loses fertilizer effect on the crop. If you put a clean piece of iron on the stove and put the urea granules on it, it can be seen that the urea melts and volatilizes quickly, and a small amount of white smoke is emitted, which can smell ammonia.
Ammonium sulphate: Ammonium sulphate for agriculture is white or light colored crystal, nitrogen content ≥ 20, 8% (secondary product). Ammonium sulfate is easy to absorb moisture, soluble in water, and the aqueous solution is acidic. It reacts with alkali to release ammonia gas. When ammonium sulfate is heated on the fire, it can be slowly melted and accompanied by ammonia release.
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