1. The appearance of urea is granules or crystals, easy to absorb moisture, absorb moisture in the air and deliquescence, and is easily soluble in water and ammonia water. Put a piece of iron on the stove and place the urea granules on it. The urea will quickly melt and evaporate away. At the same time, there will be a little white smoke that smells of ammonia. The total agricultural nitrogen content (on a dry basis) was 46.0%.
2, the appearance of ammonium sulfate is white or light-colored crystal, easy to absorb moisture, soluble in water, aqueous solution is acidic. When dissolved in water, it absorbs heat and reacts with alkali to release ammonia. When heated on fire, it melts slowly compared with urea, ammonium nitrate, and ammonia chloride. It can also be identified by the reaction of cesium chloride and ammonium sulfate in a water soluble white precipitate. Agricultural ammonia content (on a dry basis) is 21.0% for primary products and 20.8% for secondary products.
3, the appearance of ammonium nitrate is white or yellow, soluble in water, while absorbing a lot of heat and reduce the temperature of water, has a strong hygroscopicity and caking. A large amount of ammonium nitrate can be decomposed by heat and can burn or even explode. White smoke can be generated and ammonia smell can be heard. The total nitrogen content in agriculture (on a dry basis) was 34.4% to 34.6%.
4. The appearance of ammonium chloride is white or yellowish crystals, and it is easily soluble in water. The solubility increases significantly with increasing temperature. It has strong hygroscopicity, easy to agglomerate, and the aqueous solution is acidic. When a small amount of ammonium chloride is heated on a fire, it can smell a strong pungent odor, accompanied by white smoke, and the ammonium chloride melts quickly and disappears completely. During melting, the unmelted part is yellow. The total agricultural nitrogen content (on a dry basis) is 25%.
5. The appearance of ammonium bicarbonate for agriculture is white or slightly gray crystalline, with ammonia smell, strong hygroscopicity, easy to dissolve in water, and the aqueous solution is weakly acidic. In the identification, a small amount of sample can be rubbed with the fingers to smell a strong ammonia odor. Agricultural nitrogen content is 17%.
6, superphosphate appearance is dark gray, gray, light yellow loose powder, slightly sour, is an acidic fertilizer, sensitive to the role of alkali, easy to lose fertilizer effect. Some dissolve in water and the aqueous solution is acidic. Hygroscopicity is generally small, such as the humidity of 80% or more when there is moisture absorption, forming a hard block. Premium grades contain 20% effective phosphorus pentaoxide, 13% grade A, and 12% B.
7. The appearance of calcium magnesium phosphate fertilizer is grayish white, grayish green or grayish black powder, and the powder is very fine. Under the sunlight, it is generally seen that the crushed, vitreous-like objects exist and glitter. Insoluble in water, not easy to lose, non-hygroscopic, non-toxic, non-corrosive, heated on the fire, do not see the change, melting point around 135 degrees Celsius. Premium grade effective phosphorus pentoxide is 20%, calcium oxide 40%, magnesium oxide 12%
8. The appearance of compound fertilizers is gray-brown or gray-white particles. Some compound fertilizers have incompletely crushed urea white granule crystals, and some compound fertilizers have a single urea crystal that exists alone. Slightly hygroscopic, the compound fertilizer particles are easily crushed after absorbing moisture. Non-toxic, odorless, and non-corrosive. Nitrogen, potassium, and some of the water-soluble phosphorus in compound fertilizers can be dissolved in water. When heated on fire, white smoke is visible, and the smell of ammonia can be smelled and cannot be completely melted.
9. Aqueous ammonia is an aqueous solution of ammonia dissolved in water. It is a colorless, transparent or slightly yellowish liquid that has a strong irritating odor and is toxic. The aqueous solution is slightly alkaline. Ammonia in agricultural ammonia is generally 15%.
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