The qualitative identification of nitrogen, phosphorus and potassium fertilizers can be distinguished from the appearance and solubility of phosphate fertilizers and nitrogen and potassium fertilizers. Commonly used nitrogen and potassium fertilizers are generally white crystals (imported potassium chloride is often reddish, lime nitrogen black), and soluble in water, commonly used phosphate fertilizer is gray powder, insoluble or partially soluble in water. If you want to further distinguish between nitrogen and potassium fertilizers, you can grind the fertilizer into powder, take a small amount and put it on a small piece of iron to burn. If it can burn, melt or white smoke is nitrogen fertilizer; if it does not burn, it will beat or crack. It is potash fertilizer. From now on, nitrogen fertilizer, phosphate fertilizer and potash fertilizer can be roughly distinguished. The qualitative identification of commonly used nitrogen fertilizer varieties commonly used nitrogen fertilizer varieties are urea, ammonium bicarbonate, ammonium chloride, ammonium sulfate, ammonium nitrate and so on. If the nitrogen fertilizer sample has strong irritating ammonia odor, it is ammonium bicarbonate and ammonia. When the other nitrogen fertilizers are qualitatively identified, (1) adding alkaline solution (such as sodium carbonate, quicklime, etc.) without ammonia smell is urea, sodium nitrate, potassium nitrate. The fertilizer is put into a red-hot charcoal, and it is urea that quickly melts and emits white smoke; the sodium nitrate is the yellow smoke; the potassium nitrate is the purple smoke. 2 Add alkaline solution with ammonia smell is ammonium nitrate, ammonium sulfate, ammonium chloride; put a little fertilizer into the red-hot carbon fire, such as burning bright is ammonium nitrate; if there is "boiling," take a white smoke, there Residual ash is ammonium sulfate; direct sublimation, white smoke is very strong, a hydrochloric acid flavor is ammonium chloride. 3 If a few drops of 5% barium chloride are added to the nitrogen fertilizer solution, a large amount of white precipitate will be produced, which may further prove to be ammonium sulfate; if a few drops of 1% silver nitrate are added, a large amount of white flocculent precipitates can be further proved to be chlorination. Ammonium. The appearance of poor urea is often uneven particle size, uneven color, irregular spherical, and some poor urea appearance is perfect. The main reason for the unqualified urea production is that the process for producing urea does not pass, and more biuret is produced during the production of urea. Biuret has a toxic effect on plant growth, especially seedlings. Biuret content greater than 1%, that is, poor quality urea. Commonly used varieties of phosphorus fertilizer qualitative identification of commonly used phosphorus varieties of calcium and calcium phosphate magnesium fertilizer. Pu-calcium is slightly acidic in water, slightly smoked when burning, and has a sour smell, and hydrochloric acid is added without bubbles. The calcium magnesium phosphate fertilizer is neutral, there is no special odor, no change when burning. The commonly used potash fertilizers for the qualitative identification of commonly used potash fertilizers are potassium chloride and potassium sulfate. If a solution of 5% lanthanum chloride is added to the fertilizer solution, the white precipitate is potassium sulfate, otherwise it is potassium chloride. If a few drops of 1% silver nitrate were added, a large amount of white flocculent precipitate was produced, which proved to be potassium chloride. The potash can be distinguished by either of these two methods. Potassium sulphate is white in appearance, and some potassium chloride is light yellow or red, which makes it easy to distinguish potash species. Counterfeit potassium chloride is mainly sodium chloride, and inferior potassium chloride is mainly insufficient in potassium chloride. Qualitative Identification of Commonly Used Compound Fertilizers The United States has diammonium phosphate free from tidal conditions. The center is dark brown, with slightly yellowish edges. The outer edge of the particles is slightly translucent. The surface is slightly smooth and irregularly granules. The edge is transparent, and the particles exhibit the same properties as the damp particles after wet over the water, and a very small amount of pinkish white appears on the surface. Russia's monoammonium phosphate is mostly white or gray-white particles with harder particles. Domestic monoammonium phosphate or diammonium phosphate are also white or off-white particles, but there are also a few of them that are powdery. China Agricultural Network Editor
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