Metallographic Microscope Series The structure of optical metallographic microscope generally includes magnification system, optical path system and mechanical system, among which the magnification system is the key part. The preparation process of metallographic samples generally includes five steps: sampling, rough grinding, fine grinding, polishing and etching. The interception of samples from metallic materials and parts to be tested is called "sampling". Selection of sampling sites and grinding surfaces must be based on analysis requirements. The size of the sample is not uniform, from the perspective of easy to hold and grinding, the general diameter or side length of 15~20mm, 12~18mm high is suitable. For those too small, irregular shape and the need to protect the edge of the sample, you can adopt Mosaic or mechanical clamping method. For the inlay of metallographic sample, the appropriate size (about φ L5-20mm) of steel tube, plastic tube or paper shell tube is placed on the smooth plastic (or glass) plate, and the sample is placed in the tube to be ground face downwards into the filler, which can be solidified and hardened for a period of time. 3) Chamfering On the premise of not affecting the purpose of observation, the edges and corners on the sample should be ground off to avoid scratching the sandpaper and polishing fabric. metallurgical analysis,optical microscope for metallurgy,metallurgy microscope TROJAN (Suzhou) Technology Co., Ltd. , https://www.trojanmaterials.com
Changing the type of fertilization can sometimes play a very good role, but it is not too blind to replace the fertilization. It is even more undesirable to change one at a time. At present, there are many kinds of rushing fertilizers on the market, and there are many brands, so it is inevitable that there will be mixed fish and dragons. Many fake and shoddy fertilizations in order to quickly show the effect, excessive addition of plant growth regulators. This kind of application of the applied fertilizer is really fast, and it will take effect in 2 to 3 days. After 6 to 7 days, the vegetables will have yellow leaves and wilting symptoms.
Without understanding the characteristics of fertilizers, frequent replacement, blind application, there is a great risk. In the current situation that the agricultural capital market is full of counterfeit and shoddy fertilizers, the inadvertent, lighter vegetables lead to poor growth of vegetables, low yield, poor efficiency, and severe cases can lead to the end of production.
Different varieties of vegetables, although the characteristics of fertilizer demand in different periods and different environments are different, but for the fertilization, the focus is on the flowering result period, and the proportion of fertilizer needed is basically stable. It is recommended that the vegetable farmers can sort out the commonly used fertilizers and select a few suitable fertilization formulas. If you find a fertilizer with reasonable nutrient content, stable quality and good effect, you can use it continuously. This will not only better understand the effect of fertilization, but also reduce the risk of production and operation. 
Cucumber, tomato, eggplant and other vegetables have a long growth cycle and require a large amount of fertilizer. After entering the flowering result period, the vegetable farmers begin to apply fertilizer and promote fruit and fruit. However, in the frequent watering and manure, many vegetable farmers are rushing for one fertilizer for a fertilizer. Their point of view is: "With so many fertilizers, this does not work, and that works!"
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