First look at whether the fertilizer is double-layered, whether the three certificates (production license, fertilizer registration certificate, product certificate) are complete and effective. Then look at the outer packaging bag marked with the trademark, number, standard code, total nutrient content, the name and address of the production company, and finally see whether the fertilizer particles in the inner packaging bag are consistent, no large lumps, less powder. If used with Canadian potash, red fine potassium fertilizer particles can be seen. A compound fertilizer with a high nitrogen content, which can be stored for a period of time, with many white or colorless fine crystals attached to the surface of the fertilizer. This crystal is formed by the moisture absorption of urea and potassium chloride. Inferior compound fertilizer does not have this phenomenon.
The second national standard stipulates that the moisture content of low-concentration compound fertilizer should be less than or equal to 5%. If the moisture content exceeds this index, the feeling of grasping in the hand is sticky, and the second is that it can be kneaded into a cake shape, which will inevitably cause fertilizer particles. The compressive strength is reduced, and the slow release of nutrients of the compound fertilizer is lost. Grab the compound with half a hand, leave a layer of grayish white powder on the hand and have a good feeling of adhesion. If the particles are touched, the fine white crystals are also shown to be of high quality. The inferior compound fertilizer is mostly gray-black powder, has no sticky feeling, and has no white crystals in the particles.
A small amount of compound fertilizer is placed on the iron sheet and burned in an open flame. The ammonia smell indicates nitrogen, and a yellow flame indicates potassium. And the more ammonia smell, the yellower the yellow flame, indicating that the higher the nitrogen and potassium content, the better the compound fertilizer. On the contrary, it is a poor quality compound fertilizer.
Four smell compound fertilizers generally have no odor (except organic compound fertilizer). If there is odor, it is because the basic raw material nitrogen fertilizer mainly uses agricultural ammonium carbonate, or the basic raw material contains toxic substance trichloroacetaldehyde (acid) phosphate fertilizer. . After trichloroacetaldehyde (acid) enters the farmland, it will cause burning of the seedlings, but the crops will not be harvested, and the toxic residue period will be long, which will affect the growth of the next season crop. Therefore, it is best for farmers not to buy compound fertilizer with odor.
The five-soluble high-quality compound fertilizer has good water solubility, and most of them can be dissolved, even if a small amount of precipitate is fine. The inferior compound fertilizer is hardly soluble in water, and the residue is rough and hard.
Six tastes because the market is relatively lack of potash, the price is higher, and some unscrupulous manufacturers use red bricks to smash and act as potash. At the time of purchase, farmers can taste red granules, potassium chloride is salty, and red brick granules are not salty.
Material:Optical glass N-BK7 , H-K9L, UV Fused Silica, Sapphire, and infrared crystal materials.
Diameter:20-350mm
Diameter Tolerance:+/-0.1mm
Thickness:>2mm
Thickness Tolerance±0.2~0.1mm
Center Deviation:3-5'
Surface quality:80/50 60/40
Coating: Antireflection Coating inside
Chamfers:0.2 x 45° typical
The second national standard stipulates that the moisture content of low-concentration compound fertilizer should be less than or equal to 5%. If the moisture content exceeds this index, the feeling of grasping in the hand is sticky, and the second is that it can be kneaded into a cake shape, which will inevitably cause fertilizer particles. The compressive strength is reduced, and the slow release of nutrients of the compound fertilizer is lost. Grab the compound with half a hand, leave a layer of grayish white powder on the hand and have a good feeling of adhesion. If the particles are touched, the fine white crystals are also shown to be of high quality. The inferior compound fertilizer is mostly gray-black powder, has no sticky feeling, and has no white crystals in the particles.
A small amount of compound fertilizer is placed on the iron sheet and burned in an open flame. The ammonia smell indicates nitrogen, and a yellow flame indicates potassium. And the more ammonia smell, the yellower the yellow flame, indicating that the higher the nitrogen and potassium content, the better the compound fertilizer. On the contrary, it is a poor quality compound fertilizer.
Four smell compound fertilizers generally have no odor (except organic compound fertilizer). If there is odor, it is because the basic raw material nitrogen fertilizer mainly uses agricultural ammonium carbonate, or the basic raw material contains toxic substance trichloroacetaldehyde (acid) phosphate fertilizer. . After trichloroacetaldehyde (acid) enters the farmland, it will cause burning of the seedlings, but the crops will not be harvested, and the toxic residue period will be long, which will affect the growth of the next season crop. Therefore, it is best for farmers not to buy compound fertilizer with odor.
The five-soluble high-quality compound fertilizer has good water solubility, and most of them can be dissolved, even if a small amount of precipitate is fine. The inferior compound fertilizer is hardly soluble in water, and the residue is rough and hard.
Six tastes because the market is relatively lack of potash, the price is higher, and some unscrupulous manufacturers use red bricks to smash and act as potash. At the time of purchase, farmers can taste red granules, potassium chloride is salty, and red brick granules are not salty.
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We are manufacturing high transmission and durability domes. BK7 or HK9L Glass domes are often used in meteorology applications. Fused silica domes are commonly used in underwater applications at extreme environments. Other application for our dome include meteorology applications, pyranometers, defence applications and as high pressure view ports in underwater cameras and submersibles.
Material:Optical glass N-BK7 , H-K9L, UV Fused Silica, Sapphire, and infrared crystal materials.
Diameter:20-350mm
Diameter Tolerance:+/-0.1mm
Thickness:>2mm
Thickness Tolerance±0.2~0.1mm
Center Deviation:3-5'
Surface quality:80/50 60/40
Coating: Antireflection Coating inside
Chamfers:0.2 x 45° typical
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China Star Optics Technology Co.,Ltd. , https://www.csoptlens.com