Development and Application of Rapid Soil Testing Technology in China
Development and Application of Rapid Soil Testing Technology in China China's agricultural development has a history of more than 5,000 years. Farming and harvesting on the land has become the only way for farmers to obtain food. Before long ago, farmers would not consider the problems of soil nutrients and fertility. With the advancement of science and technology, we already know that factors such as soil nutrients, fertility, composition, and trace elements will have a great influence on the yield and quality of crops. The rapid soil testing technology represented by the soil nutrient fastness tester came into being. The rapid development of soil nutrient fastness measurement technology in our country is not long, but it has begun to take shape. Today I will talk about the development and application of rapid soil testing technology in China. Since people recognized that soil is a nutrient repository for crops and can use soil rapid measurements to understand the effectiveness of soil nutrient supply to crops, the study of soil rapid measurements and new methods has not stopped. However, the proposed new method must go through a large number of relevant studies and field verifications, and establish soil nutrient abundance index system and fertilization index system. This process needs to do a lot of research work, but also requires a lot of funding. Therefore, the main methods for rapid soil testing were established in the United States, the former Soviet Union, the United Kingdom, Germany, and other countries, and a relatively complete system of rapid soil testing and recommended fertilization has been established. Other countries are applying these methods to conduct adaptive condition studies and calibration studies, and to establish an index system suitable for the country. The rapid soil testing technology in China can be traced back to the 1960s. At that time, the rapid determination technology of soil nutrients based on visual colorimetry had been greatly developed. The determination of water content was mainly alcohol combustion; nitrate nitrogen was used. Nitrate test powder or diphenylamine colorimetric method; Ammonium nitrogen by Nessler's reagent colorimetric method; Available Phosphorus molybdenum blue (stannous chloride reduction) colorimetric method; Available potassium is sodium cobalt nitrite or sodium tetraphenylborate. Turbidity method; soil pH value by colorimetry. Since the 1980s, with the development of electro-optical colorimetry technology, a rapid field soil nutrient measurement technique using photoelectric colorimetry has emerged. The method of testing is basically the same as that of visual colorimetry, but it has been adopted. Electro-optical colorimetry has greatly improved the accuracy of analysis, and has developed rapid-measuring devices (generally, photoelectric colorimeters). The input of soil parameters and fertilization parameters into speedometers or computer software can be easily obtained. Fertilizer amount data. These speed measuring instruments aim at improving the field test capability of the equipment and accelerating the test speed, and their accuracy can basically meet the quantitative requirements. With the continuous deepening of research and promotion of soil testing and fertilizer application technology, portable, rapid soil testing and technology have received more and more attention from people and become one of the focuses of research and development. In recent years, many speed measurement methods and speed measurement instruments have come out one after another. For example, the Soil Fertility Institute of the Chinese Academy of Agricultural Sciences and the Nanjing Institute of Soil Science and Technology of the Chinese Academy of Sciences all researched and developed the soil quickness tester and the TPY-6 soil nutrient speed tester manufactured by Zhejiang Top Instrument. These instruments and equipment are aimed at rapid testing. Their application complements laboratory analysis and promotes the application of efficient fertilization technology.
High speed door
Hongfa fast shutter doors by the Division we learn from foreign advanced technology and equipment , and to draw on the advantages of similar products in domestic self-developed high-tech products , with insulation , insects, wind , dust, noise, anti-odor, lighting and many other features , the high speed door can be widely used in food , chemical , textile , refrigeration , electronics , printing , assembly , precision machinery , logistics . warehousing and other places , the high speed rolling shutter door Can be extremely satisfying frequent high-performance logistics and clean place with a variety of needs and saving energy , increasing air-conditioning effect , fast closing , improve operational efficiency and create a better work environment
PVC High Speed Rolling Door, car wash doors, PVC high speed garage doors, high speed fabric garage doors, fast roll up garage doors SHENZHEN HONGFA AUTOMATIC DOOR CO., LTD , https://www.hongfafrud.com
Material Selection:
1. Frame: 2MM thicknesses cold-roll Stainless steel.
2. Motor: Germany SEW brake motor (outer), power 0.75KW, power supply 220V.
3. Control system: Imported Japan Mitsubishi converter and PLC to control of electric box (150%1HZ)
4. Opening & closing speed: 0.6-1.5m/s (adjustable).
5. Safety Device: Korea Photocell Sensor, emergency stopping reaction when sensing obstacles.
6. Curtain: France high-density polyester fiber and the surface coating processing, thickness 0.8MM, variety colors can be chose: Red, yellow, blue, green, orange, gray, white, transparent, etc. Tensile strength: 4000/3500N/5cm, tear strength 600/600N. Fire-proofing level: German standard DIN75200 Usage temperature: -30 ° C +70 ° C.
7. Wind resistant: The Aluminium alloy Reinforce Girder to increase wind resistant effect.
8. Curtain replacement function: Aluminium alloy Reinforce Girder is loaded between 2 pieces Curtain, can be replaced easily if any curtain broken, save your cost.
9. Transparent window: 1.2MM thickness transparent PVC window, size and location is up to your request, more safer.
10. Seal: Seal brush are Installed inside the guides, and the special bottom design, to fit any uneven ground.
11. Cotrolling way: Push button + radar sensor, very convenient.
12. Limiting Switch: Mechanical limiting switch, easily and exactly.
13. Emergency STOP: With emergency stop button on control panel, can stop easily by
Hand once disconnect or accident
14 Fault recovery function: All Hongfa's production is with fault recovery function, system will self-recovery after power cut off.
15. Delivery time: About 7 business days with contract and deposit confirmed.
16. Pyament item: 50% before production, and the other 50% before shipment.
17. Warranty Details: We provide 12 months warranty for all doors and accessories (except man-made disasters, Irresistible natural disasters, ect^).
We have many professional engineers with rich experience, qualified products, perfect service system, and good cooperation relationship with many famous companies.
We have the best solution for you, and we provide all the support you need to achieve optimum results, or value, or both, from whatever products you buy.
We provide 12 month warranty for all product and accessories. And custom made door size/color/material.