Cotton is a very important economic crop in China. Cotton planting is an important cropping industry for increasing production and income in many areas of China. In recent years, in order to protect the income of cotton farmers, leading the majority of cotton farmers to increase production and income, how to guide cotton farmers to grow cotton has become one of the key contents of the government work. To achieve scientific planting management, relying on experience is not reliable, the best way is to use scientific instruments such as leaf area instrument to carry out research, provide feasible customized solutions for scientific management of cotton, and achieve stable production with refined production management. High-yield goal. The growth quality of cotton is closely related to soil and climatic environment. To achieve scientific management, increase production and increase efficiency, it is necessary to adopt scientific and technical means to ascertain the mystery of plant growth and understand the factors affecting cotton yield. And a linear relationship with external factors. The leaf is the most important nutrient part of the plant, and the leaf area is a characteristic index that can be measured by the growth and development status of the plant. In addition, the leaf area variable reveals physiological characteristics such as light harvesting, photosynthetic efficiency, respiration, transpiration, fruiting, water balance, and fertilizer effects. Therefore, studying the mysteries of plant growth and guiding scientific planting management can start from the leaf area. The leaf area meter is a professional instrument for measuring the leaf area of ​​plants. In the cotton planting research, the application of this instrument can help us carry out relevant research and research more deeply, obtain accurate data and provide a strong basis for scientific management of cotton. . In fact, the regulation of leaf area is more common in the actual production management process. For example, planting cotton will take reasonable close planting, balanced fertilization, timely irrigation, and rational use of plant growth regulators. These measures are actually used for Appropriately expand and adjust the leaf area, so that the leaf area of ​​the cotton crop is kept within a reasonable range, so as to improve the utilization efficiency of the leaves for photosynthesis and increase the yield. Now, with the help of the leaf area meter, the leaf area management of the crops is guided in a more scientific way, making these important production measures more effective.
Synthetic cryolite is a white crystalline powder or a sandy-size granularity, and a pinkish crystalline powder or a sandy-size granularity as well. Sp.gr.2.95-3.01g/cm3, melting point about 1000°C, specific heat 1.056j/g°C at 18-100°C. It`s slightly soluble in water, but insoluble in anhydrous hydrogen fluoride. The content of its crystal water will be decreased while the increasing of the molecular ratio, therefore its loss on ignition will be also decreased while the increasing of the molecular ratio. After the paste of synthetic cryolite with different molecular ratio dehydrates, the loss on ignition at 800°C will appear 10.34%, 6.22% and 2.56% when the molecular ratio reaches 1.74, 2.14 and 2.63 reactively.
Uses:
It`s mainly used as a flux in the aluminum smelting by fused-salt electrolysis; also an opalizer in the manufacture of enamel; an opacifier and auxiliary solvent of glass and enamel; an insecticide of crops; a flux in aluminum alloy casting; and in the production of ferrous alloy and effervescing steel; as well as a wear-resistant filler for Resin and rubber-boned Abrasive wheels.
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