Second, pay attention to the application method. When using chlorinated fertilizer as base fertilizer, it should be applied early and covered with soil. Generally, it should be applied one week before sowing or transplanting, and applied to the underside of seeds or seedlings, preferably from 5 cm to 7 cm from topsoil. For top dressing: take a point or strip application, and 5 cm -10 cm away from the crop plants, avoid using it. When the application amount is large, it can be applied in two to three times. Top dressing can also be applied to water or dilute urine.
Third, try to apply in the seasons and areas with more rainfall. In the rainy season or in areas with high precipitation, the application of chlorinated fertilizers, chloride ions can be leached with water, and it is not easy to accumulate in the soil, thus avoiding side effects on crops. In dry land without irrigation conditions, saline-alkali land with poor drainage, high temperature and dry seasons, and areas with water shortage and low rainfall, it is better to use less or less chlorinated fertilizer.
4. Cooperate with the application of decomposed organic fertilizer and phosphate fertilizer. When applying the chlorinated fertilizer, combined with the application of the decomposed organic fertilizer, the fertilizer effect can be improved and the adverse effects of chloride ions on the soil can be alleviated; in the soil with low effective phosphorus content, the chloride ions can inhibit the absorption of phosphorus by the crop. Therefore, when applying chlorinated fertilizer, an appropriate amount of phosphate fertilizer should be applied. The complex (mixed) fertilizer and formula fertilizer prepared by using chlorinated fertilizer and urea, ammonium phosphate, superphosphate, calcium magnesium phosphate, etc. can not only reduce the harm of chloride ions, but also use nitrogen, phosphorus and potassium together. It can balance the effect of fertilization.
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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