First of all, there are two main types of potash fertilizer, one is elemental potash fertilizer and the other is compound fertilizer containing potassium.
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Common elemental potassium fertilizers include potassium chloride, potassium sulfate, and potassium silicate. Potassium chloride: divided by origin, there are two types of red and white; the shape is divided into block, powder and irregular granular; potassium oxide content (K2
O% means) imports are generally 60%, domestic production is 57% or 60%. Potassium sulfate: generally white crystalline particles or powder. Some products are slightly motley because of impurities. Domestic potassium sulfate including Lop Nor or Taiwan, generally contains K2
O is 50%, and German production is 54%. Potassium silicate: dark gray powder, which is an industrial by-product. The content can only be confirmed by the test. Generally, K2O is 10% to 14%, which is alkaline.
Common potassium compound fertilizer, potassium content of ternary compound fertilizer can be seen from the packaging bag: N-P2O5-K2O. Binary compound fertilizer-potassium nitrate: white crystalline particles, rare in the market.
Secondly, the determination of the authenticity and inferiority of potash fertilizer is very complicated, and ultimately depends on laboratory tests. The simple identification method of potash fertilizer introduced here is just a qualitative identification method, which can not identify the level of potassium content and has limited effect.
One is the iron flake combustion method: put a few fertilizer particles (large or small) on a red iron flake to burn. Anything that does not melt, has no odor, and bounces when heated, can be roughly classified as potash fertilizer. If the iron piece is tilted to make the fat particles directly burned at high temperature, a colored flame will appear, the golden shiny flame is sodium, and the light yellow entrained lilac flame is potassium. There is also a type of powder in potash fertilizer, which can be brick red, light red or white. The method of identification is also burning on iron sheets. Potash fertilizer shows no melting and no odor; while phosphate fertilizer shows light gray, although it also has Does not melt, but smells. Supplementary note: If the fertilizer particles on the iron sheet are melted after high temperature, and there is thick smoke, all the ammonia odor is ammonium nitrogen fertilizer, and only those without ammonia smell may be nitrate; if the fertilizer particles on the iron sheet do not melt and do not jump , And those who smell sour or bone odor, may be phosphate fertilizer.
The second is to dip the saturated potassium fertilizer solution on the wire ring and burn it on a high-temperature flame. Observe the flame color. It is difficult to distinguish the flame color of potassium and sodium. However, if the market encounters inferior potash fertilizers other than the conventional ones, such as small pieces or powders of unrefined potash feldspar, it is only necessary to determine the content of soluble potassium by means of laboratory tests. The combustion method alone can only be qualitative, not quantitative, that is to say, it can only be distinguished from true and false, and cannot be distinguished from superior or inferior. Therefore, when farmers choose to buy fertilizer, they must go to a regular sales outlet to avoid being cheated.
Author: Cao Yiping (China Agricultural University)
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