Large Diameter Steel Pipe Fitting
usually these carbon steel elbows distinguished by connection ends, The ends may be machined for butt welding , threaded , or socketed , so the carbon steel elbows are consist of butt weld,thread elbow.socket elbow and other series.the material is selected accoding to the application use such as high temperature use,sanitary fitting,regular industrial use etc
Seamless or Welded
Welded DN450 ( 18`` ) --- DN2500 ( 100`` )
Large Diameter Elbow,Large Diameter Fitting,Large Diameter Steel Pipe Fitting,Pipe Fitting-Steel Shijiazhuang Bang dong Pipeline Technology Co,Ltd. , https://www.bd-pipefitting.com
First, you need to understand the content of biological pesticides. It includes microbial pesticides, biochemical pesticides, genetically modified organism pesticides, natural enemy biological pesticides and plant-derived pesticides. The application of biological pesticides can kill a variety of pests and diseases; secondly, it can produce pollution-free green food; third, it can reduce environmental pollution and ensure the safety of humans and animals; fourth, it can protect natural enemies; fifth, pests and diseases are not easy to produce resistance. According to the statistics of the Ministry of Agriculture. There are 77 varieties of bio-pesticide active ingredients registered in China. The output is nearly 100,000 tons of preparations, and the use area is about 400 million mu. Biological pesticides are only one of the components of pesticides. At present, they cannot replace chemical pesticides, and further development is needed to improve the application level.
Second, we must understand the mechanism of biological pesticides. Biological pesticides have a gradual process of poisoning pests and diseases, such as high-efficiency, which first numbs the insect nerves and then destroys the viscera of the pests, which takes 1 day to 3 days; again, the insect virus is the nucleic acid of the virus particles. Into the pests, absorb the nutrients of the worms, causing the cell tissue to disintegrate and die, it takes 3 days to 5 days; the effect of jinggangmycin on the pathogens is to hinder the binding of amino acids in the cell wall, causing abnormal branches at the top of the hyphae. Although the visual effect of bio-pesticides is slower than that of chemical pesticides, the hazard function of pests and diseases can be inhibited, or they can exist in name only. Therefore, it must be rationally applied according to the characteristics of these pesticides.
Third, the correct application of biological pesticides. First, according to the local plant protection department's pest and disease forecast, apply a few days in advance; second, strictly according to the application dose, can not increase or decrease the application concentration; third, in order to improve the control effect and safety performance, can be mixed with some low-toxic pesticides To minimize the pollution of highly toxic pesticides, but high-efficiency marking is not allowed to be mixed with fungicides and acidic compounding liquids, nor can it be applied in mulberry gardens; fourth, it is not possible to expose the medicines to the sun or damp; the fifth is to choose the medicine in sunny afternoon or cloudy days. In case of rain after the medicine, it must be re-sprayed once.
Pressure Class & WT: SCH100/ SCH 120/ SCH140/ SCH 160/ XXS
Max. WT 100mm
Materials:
Carbon Steel: ASTM A234-WPB,WPC,
Stainless Steel: ASTM A403
WP304,WP304L,WP304H,WP316,WP316L,WP321,WP321H,WP347H,WP317,
Duplex Steel: ASTM A815 S31803, 2205, S32750, S32760
Low Temp Steel: ASTM A420-WPL6,WPL3,
Alloy Steel: ASTM A234-WP11,WP22,WP91
Size Range:
Seamless DN15 ( 1/2`` ) --- DN900 ( 36`` )
Correct understanding of biological pesticides
In recent years, the application of biological pesticides in agricultural production has become more widespread and has received good results. However, because the propaganda and popularization work is still not deep enough, farmers’ friends still have some misunderstandings. Some believe that biopesticides can be used instead of chemical pesticides. Pesticide food can not be called pollution-free food, one-sided emphasis on the role of biological pesticides; some believe that bio-pesticide slow effect, poor visual effect, eager to prevent pests and diseases, farmers even feel ineffective; some farmers will be more efficient biological agents BT Mix with fungicides or acidic compounding solutions to prevent loss of effectiveness. All of these have hindered the healthy and orderly promotion of bio-pesticide. Therefore, we should have a comprehensive understanding of biological pesticides. Master the correct use of technology and understand the advancement of biological pesticides.
ã€Comment】 ã€Print this article】 ã€Close this page】 ã€Large, medium and small】