Smell the smell. Nitrogen fertilizers except for ammonia, liquid ammonia, ammonium bicarbonate and other special ammonia odors, lime nitrogen has a similar smell of calcium carbide, other fertilizer varieties generally have no special odor.
Burning test. Take a small sample and place it on the iron piece and clamp it with a metal clamp. It is placed on an alcohol lamp to burn and observe its melting. Ammonium chloride and ammonium bicarbonate do not melt and directly sublimate and decompose; ammonium sulfate, ammonium nitrate, urea, sodium nitrate melt into liquid or semi-liquid; phosphate fertilizer, potassium fertilizer, lime nitrogen It is still solid without melting.
Check the solubility. In addition to lime nitrogen, the fully dissolved fertilizers are fully dissolved, and the phosphate fertilizer and lime nitrogen are insoluble or partially dissolved.
Transparent Case Steel Tape Measure
1. Shell: ABS new plastic, with shiny texture; anti-drop, wear-resistant, and not easy to deform.
2. Ruler: Use 50# first-grade strip steel with a thickness of 10 wires (0.10mm); the ruler surface is the most advanced environmentally friendly paint: odorless, smooth and wear-resistant, bright colors, clear and bright scales
3. Braking: With upper, side and bottom three-dimensional braking, the hand control feels stronger.
4. Ruler hook: The rivet ruler hook structure is not easy to deform and ensures more accurate measurement.
5. Carrying straps: rubber and nylon; high-grade and high-quality; strong and durable, and feel good.
6. Foot spring: generally 50# carbon steel, 65# manganese material: strong toughness and high accuracy.
7. Anti-drop protective cover: high-quality plastic, prevent breakage and collision damage, and enhance durability.
8. Labeling: can be produced according to customer requirements.
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