Correct calculation of accurate weighing, to avoid excessive use of pesticides, pay attention to the active ingredient content of the agent, accurately match the concentration of the pharmaceutical liquid, do not arbitrarily increase the concentration and increase the number of applications.
When formulating a scientific preparation, prepare the mother liquor first. Add half of the water to the medicine box, then add the mother liquor, then add enough water to dilute to the required concentration. Stir well when mixing, and add some adhesive. Improve the physical properties of the liquid.
Scientific compounding of mixed pesticides must have clear targets and requirements for prevention and control. After compounding, it is necessary to reduce the cost of prevention and control, and to increase efficiency and expand the scope of prevention and control; it is necessary to be efficient, low-toxic and low-residue, and to ensure the safety of agricultural products. When mixing pesticides, pay attention to the negative reactions between pesticides, and not interfere with physical, chemical or biological effects. Generally, alkaline pesticides and acidic pesticides are not mixed, microbial insecticides and chemical fungicides, microbial fungicides are mixed, copper-containing pesticides and zinc-containing pesticides are mixed.
Pay attention to the climatic temperature is too high, the weather is too hot, the humidity is too large, the rain and dew are not dry, the wind speed is too large, do not apply medicine when it is raining. It is also necessary to avoid the use of pesticides during the sensitive period of the crop.
Adjust the spray device, evenly spray the knapsack sprayer, change the conical nozzle to the fan-type nozzle, and change the serpentine spray to the linear spray to reduce the re-spray and improve the spray quality. When spraying, consider the wind direction, pay attention to the protection of nearby sensitive crops, and at the same time, the spray should be even, the fog should be fine, and evenly. The medicine should be thoroughly cleaned before and after use.
The fresnel lens is a thin sheet made of plastic material. One side of the lens surface is smooth, and the other side is molded with concentric circles from small to large. Its grooves is designed from the interference of light, the relative sensitivity, and receiving angle requirements.
Compared to the conventional Spherical Lens, a Fresnel lens by the lens divided into a series of concentric circles theoretically infinite number of lines (i.e., the Fresnel zone) to achieve the same optical effect, while saving the amount of material For these lines, the overall thickness of the lens is reduced; ordinary Fresnel convex lens is actually a continuous curved surface is truncated to a section of a discontinuous change of the curvature as the surface is finely divided, so look like a
circle around the lines. Fresnel lenses may in fact be regarded as a series of prisms are arranged in a ring, wherein the relatively sharp edge, and the center of the convex surface is relatively smooth.
Fresnel lenses are mainly used in optical imaging industry ( projectors, VR, AR, etc.), Fresnel lenses are used in LED lighting distribution (spotlights, floodlights, stage lights, traffic signal lights), infrared induction lenses are used in ( industry 4.0 intelligent fields, building security systems, induction lighting, etc.), large Fresnel lenses are used in ( photovoltaic concentrated light generation, heat collection, light utilization, etc.).
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