There are easy ways to identify the authenticity of potash fertilizer
The common simple potassium fertilizers include potassium chloride and potassium sulfate. Potassium chloride has two types, red and white, which are divided by origin; the shapes are blocky, powdery, and irregularly granular; the imported potassium chloride generally contains potassium oxide (expressed as K2O%) 60%, domestically produced potassium chloride. 57% or 60%. Potassium sulfate is generally white crystalline particles or powders, and some products are also slightly mottled due to impurities. Domestic potassium sulphate, including Lop Nur or Taiwan, generally contains 50% of K2O.
Common potassium compound fertilizers have binary and ternary compound fertilizers. The potassium content can be understood from the description of N-P2O5-K2O content on the packaging bag. Potassium nitrate is a binary compound fertilizer, white crystalline particles, rare in the market.
When farmers purchase fertilizers, they must go to regular sales outlets to avoid being deceived. The true and false identification of potash is very complicated, and it will ultimately depend on laboratory tests. The simple identification method of potassium fertilizer described here is only a qualitative identification method, and the level of potassium cannot be identified.
First, iron burning method. Fertilizer granules (large or small) are burned on a red-hot iron plate. Any non-melting, odorless, and heat-producing bounce phenomenon can be roughly classified as potassium fertilizer. If the iron plate is tilted to directly subject the fertilizer to high temperature combustion, a colored flame will appear. The golden shiny flame is sodium, and the pale yellow entrained lavender flame is potassium. There is also a kind of powdered form of potash, which can be brick red, light red or white. The method of identification is also burning on iron pieces. Potassium fertilizer is not melted and odorless. Phosphate fertilizer is light grey. Although it does not melt, it smells. Supplementary explanation: 1. If the iron pellets are melted by the high temperature and there is thick smoke, ammonia nitrogen fertilizer is the ammonia odor, and ammonia may only be ammonia nitrate. 2. If the fertiliser granules on the iron pieces do not melt and do not pulsate, and odor-sweet or bone-odor odors, it may be phosphate fertilizer.
Second, the saturated potassium fertilizer solution is immersed in a wire coil and burned on a high-temperature flame to observe the color of the flame. However, it is difficult to grasp the difference between the flame color of potassium and sodium. If the market encounters poor quality potassium fertilizers other than conventional ones, such as the use of unrefined potassium feldspar small or powdery fake potassium, this can only be identified by assaying soluble potassium content. Only the combustion method can only be qualitative, not quantitative, that is to say, can only distinguish between authenticity and inferior quality.
In short, there is a saying that is right: "Nothing cheaper." That is to say, the above simple and effective methods can distinguish three categories of N, P, and K fertilizers, and farmers' friends should pay attention to quality and look for brands when purchasing potash fertilizer.
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