Analysis fertilizer

 Product brochures. Instructions on the fertilizer can fully reflect the content of the various elements, as well as total nutrient content needs to grow a variety of crops. In the fertilizer should be marked with the N, P2O5, K2O words the percentage of total net nutrients. Total fertilizer nutrient content based on the level of fertilizer can be divided into three levels, high concentrations (total nutrient content of not less than 40%), concentration (total nutrient content of not less than 30%), low concentrations (total nutrient content of not less than 25% ). The higher the concentration, the stronger fertility, whereas smaller. In addition, you should carefully review the product certification (quality certificate), production date, batch number, address, etc., domestic fertilizer, the bags containing the fertilizer names, trademarks, specifications, net content and other identification. 2. Nitrogen content detection quality inspection method in nitrogen fertilizer can be used burning method, add lime method, dissolution method to be tested. Heating can be a small amount of fertilizer onto the thin iron plates, flame burning in the iron, if they have doctrinal and pungent ammonia on iron, and found no residue on the iron plates, indicating that the fertilizer is relatively pure high-nitrogen fertilizer, whereas a lower purity. Heating method is the small amount of slaked lime and slaked lime fertilizer mixing, the principle of the method is the use of nitrogen to react with the calcium compound, if a higher concentration of nitrogen, the reaction rate will be very fast, will be very strong odor of ammonia. Dissolution method refers to a small amount of fertilizer into the water, if the fertilizer can be dissolved, indicating a high purity of the nitrogen because of higher solubility of nitrogen fertilizer. 3. The quality of testing methods potash potash quality inspection methods are mainly dissolution method and the flame reaction. Dissolution method method of operation is the same as with nitrogen test. Flame reaction method is the use of potassium is the nature of non-ferrous metals, combustion process, the flame reaction occurs, the normal potassium combustion appear purple or pale purple. The cotton tampons made of bean size, after 95% alcohol by wetting, dipped in a small amount of potassium and tweezers were fixed in the alcohol lamp burning, observe the color change, if the flame color purple or light purple, then prove that the higher purity of the potash, if mixed with other colors it indicates that the potash impurities, purity is not enough. The phosphate fertilizer quality inspection method is relatively simple test method can be carrots Piga boil water, and then a small amount of fertilizer into the boiling after removing a small amount of clear liquid, if the observed color from purple juice turns green, indicating that the phosphate better quality, higher purity