First, protect natural enemies from using selective pesticides to reduce damage to natural enemies. It is forbidden to use pyrethroid pesticides to prevent the killing of natural enemies and cause pests to re-crack. Because paddy fields are a special ecosystem, multi-species survival, especially the variety of natural enemies, has a good effect on controlling pest populations, especially to protect predatory natural enemies such as spiders, black-shouldered green scorpions and parasitic natural enemies. Small bees, Trichogramma, cockroaches, beetles, etc., give full play to the natural control of natural enemies.
Second, protect the applicators to seriously publicize and train farmers, educate them to pay attention to their own protection, reduce pesticide poisoning, especially in the hot season, educate and guide farmers not to work at high temperatures at noon, while avoiding fatigue operations and protecting the body. health.
Third, the protection of crop rice is the staple food of the masses. The quality and safety of sanitation are the most important. It is necessary to prevent the pollution of pesticide residues and prohibit the use of highly toxic and high-residue pesticides. At the same time, carefully implement the safety interval to ensure that pesticide residues in rice do not exceed the standard.
The fourth is to protect fish in some areas of aquatic life, raise fish, raise shrimp, raise crabs, and pay more attention to the use of pesticides, especially to control the use of flubendiamide to prevent shrimp and crab poisoning.
Tungsten carbide (chemical formula: WC) is a chemical compound (specifically, a carbide) containing equal parts of tungsten and carbon atoms. In its most basic form, tungsten carbide is a fine gray powder, but it can be pressed and formed into shapes for use in industrial machinery, cutting tools, abrasives, armor-piercing rounds, other tools and instruments, and jewelry.
Tungsten carbide is approximately two times stiffer than steel, with a Young's modulus of approximately 530â€“700 GPa (77,000 to 102,000 ksi),[and is double the density of steel-nearly midway between that of lead and gold. It is comparable with corundum (Î±-Al
2O3) in hardness and can only be polished and finished with abrasives of superior hardness such as cubic boron nitride and diamond powder, wheels, and compounds.
Tungsten Carbide Products
Tungsten Carbide Disc Cutters,Cemented Carbide,Tungsten Carbide Bar,Tungsten Carbide Punching Dies
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