There are many varieties of chemical fertilizers, and different varieties of chemical fertilizers have different physical and chemical properties. In the absence of equipment drugs, the following simple method can be used for identification.
First, from the appearance of white or gray fine crystals and ammonia smell is ammonium bicarbonate.
Second, from the dissolution of water to check with a small spoon to take a spoonful of fertilizer, pour the cup filled with water, and then mix with a clean stick for 1-2 minutes, if the fertilizer is dissolved, it may be nitrogen fertilizer (lime (except for nitrogen) or potash (except kiln ash potassium); if partially dissolved, it is superphosphate and heavy superphosphate; if not dissolved, it may be lime nitrogen, calcium magnesium phosphate, steel slag phosphate, rock phosphate powder and kiln dust Potassium. If it can be dissolved, then add a small amount of lime to the solution (it can be slightly heated when it is cold). If there is ammonia smell, it may be ammonium sulfate, ammonium chloride or ammonium nitrate; if there is no ammonia, it may be sulfuric acid. Potassium, potassium chloride or urea.
Third, ammonium sulfate, ammonium nitrate, ammonium nitrate discriminating method in the burning of charcoal or burning in the fire does not burn, only gradually melted and disappeared and emit ammonia smell is ammonium sulfate; can be melted into gas, emit ammonia odor and The white light is ammonium chloride; it burns rapidly and has a red-yellow flame and a loud whistling sound. At the same time, the odor and white smoke that emits ammonia is ammonium nitrate.
Fourth, urea, potassium sulfate, potassium chloride differentiation method: on the fire can burn, release odor, and can quickly melt and evaporate finished is urea; can burn, and there is violent sound, there is no ammonia smell is sulfuric acid Potassium and potassium chloride, but potassium chloride has a salty taste and can be distinguished from potassium sulfate.
Five, superphosphate and heavy calcium superphosphate method has a wet feeling and sour taste is superphosphate.
Sixth, lime nitrogen, calcium magnesium phosphate phosphate fertilizer, steel slag phosphate fertilizer, phosphate rock powder and kiln ash potassium difference method: These types of fertilizer are insoluble in water, but the lime nitrogen water will have a fever and calcium carbide smell; calcium magnesium phosphate fertilizer is gray or dark Green glassy powder, shiny; phosphate rock powder is brown, gray or gray-black powder, non-hygroscopic; slag phosphate steel slag, black powder, a major proportion, does not absorb moisture; kiln gray potassium gray or gray yellow Powder, delicate and light texture, strong moisture absorption. (Chen Guishan)
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