Simple method to identify true and false fertilizers
Packaging identification method 1. Check mark: According to the regulations of the relevant state department, the chemical fertilizer packaging bag must indicate the product name, nutrient content, grade, trademark, net weight, standard code, factory name, site, and production license number mark. If the above signs or signs are not complete, it may be counterfeit or inferior fertilizer. 2. Check the sealing of the bag: Special attention should be paid to the chemical fertilizer with obvious sealing and unsealing marks. This phenomenon may be adulterated. Shape and color identification Urea: white or light yellow, granular, acicular or prismatic, no powder or few powders. Ammonium sulfate: white crystals. Ammonium chloride: white or light yellow crystals. Ammonium bicarbonate: white or other colored powder or granular crystals. There are also individual manufacturers that produce large particles of spheroidal ammonium bicarbonate. Superphosphate: Off-white or light gray powder. Heavy calcium phosphate: dark grey, off-white particles or powder. Potassium sulfate: White crystals or powder. Potassium chloride: white or light red particles. Odor identification method If there is a strong pungent ammonia flavor of the liquid is ammonia; obvious pungent ammonia flavor particles are ammonium bicarbonate; fine sour powder is heavy superphosphate. If superphosphate has a very pungent sour taste, it is very likely that spent sulfuric acid is used in the production process. This fertilizer is very toxic and can easily damage or burn the crop. What needs to be reminded is that although some chemical fertilizers are true, their content is very low, such as inferior superphosphate, and the effective phosphorus content is less than 8% (the minimum standard should reach 12%). These chemical fertilizers are poor quality chemical fertilizers and have little effect on fertilizers. Professionals should be identified when purchasing them. Elbow And Knee External Fixation
The elbow and knee external fixation is mainly used for open fracture of elbow joint and knee joint, stiffness of elbow joint and knee joint after trauma, severe comminuted intra-articular fracture.
The external fixator has a fine-tuning bolt, which can stretch the joint space; Universal needle block, can be free direction needle; Superjoint fixation, early joint mobility; Hinge structure design, easy to install and other advantages.
Elbow And Knee External Fixation,Knee External Fixation,External Fixators,Orthopedic Fixators Jiangsu Aomed Ortho Medical Technology Co.,Ltd , https://www.aomedortho.com