Due to the special ecological environment in the vegetable shed, it is suitable for all kinds of pests and diseases throughout the year. To effectively control pests and diseases and cultivate high-quality and safe pollution-free green vegetables, it is necessary to use pesticides scientifically and correctly. 1. Correct drug selection: Each pesticide has a certain scope of prevention and control. Therefore, before use, it is necessary to understand the performance and use of each pesticide, and select the pesticide according to the characteristics and objects of the pests in the shed, so that it is targeted. 2. Timely medication: According to the planning rules of pests and diseases, it should be applied in the early stage of pests and diseases. Taking into account the warm and humid environment in the shed, it is not advisable to spray on rainy days or high temperatures to prevent the spraying in the shed and to reduce the efficacy. At the same time, do not use sulfur preparations to control melon and vegetable diseases under high temperature conditions to avoid phytotoxicity. 3. Rotational medication: It should be used alternately according to different types and different mechanisms of action. The mechanism of action of various pesticides is different. If attention is paid to alternate use, the occurrence of pest and disease resistance can be avoided or delayed. 4. Safe use of drugs: In the production of vegetables, high-efficiency, low-toxic, low-residue pesticides should be used. It is forbidden to increase the concentration of the liquid at random. The number of times of use should not be too much, and the drugs should be used strictly according to the interval to prevent the occurrence of phytotoxicity in vegetables. At the same time, it is strictly prohibited to use highly toxic and highly toxic pesticides on vegetables, promote the use of biological pesticides, produce pollution-free vegetables, and ensure the health of consumers.
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Solar cells use sunlight to generate electricity. As long as the sun shines on the battery, it will continue to generate electricity. It is a clean energy with the advantages of safety, reliability, no noise and no consumption of raw materials. It has the advantages of great convenience for residents in remote areas. So what is the working principle of solar energy? Today we'll explore it. Solar cell is a device that directly converts light into electric energy through photochemical effect. When sunlight shines on the semiconductor pn junction, a new hole (electron pair) is formed. Under the action of the electric field, the hole flows from the N region to the p region, and the electron flows from the p region to the N region. After the circuit is connected, a current is formed to convert light energy into electric energy.Solar panel, also known as solar cell module, is a kind of photoelectric semiconductor sheet that uses sunlight to directly generate electricity. It is an assembly composed of several solar cells assembled on a plate in a certain way. It is the core part of the solar power generation system.The earth, the green home for human survival.
With the development of human civilization, it has gradually become a victim of economic growth. Clean energy is imminent.
The sun concentrates 99.87 percent of the mass of the solar system, and one twenty-two percent of the energy radiates to the earth, becoming the main source of photosynthetic heat on the earth. Solar energy is one of the cleanest, most lasting and most magical energy of all.
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