First, adhere to the application of organic fertilizer and inorganic fertilizer. The soil available nutrients in the new greenhouse can not meet the needs of various nutrient elements for vegetable growth and development. In order to increase the yield and quality of vegetables, it is necessary to apply a sufficient amount of fertilizer while adding organic fertilizer. The ratio of organic fertilizer to inorganic fertilizer is generally controlled at 4:6 or 5:5. The newly built greenhouse (667 square meters) is applied with 3000 kg of human excrement, and then combined with 20-35 kg of urea. In this way, in general, for 2-3 years of continuous application, the total porosity of the soil, the porosity of the capillary, and the water-stable aggregates less than 1-0.25 mm are significantly higher than the single-fertilizer area with the same amount of nitrogen, and the soil structure remains. The rate of chemical fertilizer was 27%, and that of organic fertilizer was 39.2%.
Second, the rational application of organic fertilizers and special fertilizers. According to experimental tests, it is more suitable to apply manure and fertilizer to 5:5 or 4:6. After 3 years of testing, the soil organic matter increased by 0.23-0.33% than the single-purpose special fertilizer, and the nitrogen and available phosphorus content were also higher than the single-purpose fertilizer. At the same time, the activities of soil alkaline phosphatase, urease and protease were all high in specific fertilizers. This shows that the combination of organic fertilizer and chemical fertilizer can improve the physical and chemical properties of the soil, enhance soil fertility, and increase the activity of enzymes in the soil.
Third, nitrogen, phosphorus, potassium and three chemical fertilizers combined with application. Vegetables grow fast, require a large amount of fertilizer, and require a large variety of nutrients. Therefore, when applying chemical fertilizers, it is necessary to apply nitrogen, phosphorus and potassium fertilizers together in order to achieve the best yield increase effect. Generally, new greenhouses are used, 30 kg of urea per acre (667 square meters), 10 kg of three-factor phosphate fertilizer, 20-30 kg of potassium sulfate; or 3,000 kg of high-quality farmyard manure on acre (667 m2). Combined with the application of 100 kg of multi-bio-organic compound fertilizer, the soil is fertilized and the effect is better.
Excerpted from: Hubei Science and Technology News
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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