1. Deep application of urea Regardless of whether urea is used as base fertilizer or top dressing, it should be applied deeply over the soil, and the fertilization depth should be 10 cm ~ 12 cm; deep application of urea can significantly increase the utilization rate. According to experiments, urea surface application or shallow application of 2 cm ~ 3 cm, the utilization rate is only 30%; fertilization depth of 5 cm, the utilization rate is 45%; deep application of 10 cm to 20 cm, the utilization rate can reach 65%. 2. Early application of urea Urea belongs to ammonium amide nitrogen fertilizer, which cannot be directly absorbed and utilized by crops after being applied to the soil. It needs to be converted into ammonium nitrogen under the action of urease in the soil to be absorbed by the roots. If the application time is too late, not only is it not conducive to the effect of fertilizer, but also may cause crops to be greedy and late. Three, spray urea Urea has a small molecule size and is easily absorbed by leaves. It is the most suitable fertilizer for foliar spraying. Foliar spraying is highly targeted, has a fast absorption rate, is not affected by soil environmental factors, has high nutrient utilization, and has a small amount of fertilizer, and the effect of increasing yield is obvious, especially when the soil environment is poor, excessive moisture or drought, and the soil is too acid or excessive. When root absorption is hindered by alkali and crops are in urgent need of nitrogen nutrition and root vitality declines in the later stage of crop growth, foliar spraying can make up for the lack of fertilizer absorption by roots. Four, mixed urea Applying urea in combination with organic fertilizers, phosphorus and potassium fertilizers and trace element fertilizers can maintain soil nutrient balance, maximize nutrient utilization and increase fertilizer production. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone Integrated Roughness Profilometer Roughness Profilometer, also known as surface roughness meter, surface smoothness meter, surface roughness tester, roughness measurement meter, roughness tester, and other names. It has the characteristics of high measurement accuracy, wide measurement range, easy operation, portability, and stable operation. It can be widely used for the detection of various metal and non-metal processing surfaces. This instrument is a pocket instrument that integrates sensors and hosts, with handheld characteristics, making it more suitable for use in production sites. The exterior design is sturdy and durable, with significant resistance to electromagnetic interference, in line with current design trends. The application fields of roughness meters include: Integrated Roughness Profilometer,Integrated Roughness Profiler, Measuring Instrument,High Speed Profilometer Zhejiang dexun instrument technology co., ltd , https://www.dexunmeasuring.com
1. Mechanical processing and manufacturing industry, mainly metal processing and manufacturing. Roughness meters were originally developed to detect the surface roughness of machined parts. Especially, stylus type roughness measuring instruments are more suitable for detecting hard metal surfaces. For example, the automotive parts processing and manufacturing industry, the mechanical parts processing and manufacturing industry, and so on. As long as these processing and manufacturing industries involve the surface quality of workpieces, the detection application of roughness meters is essential.
2. In the non-metallic processing and manufacturing industry, with the progress and development of technology, more and more new materials are applied to processing processes, such as ceramics, plastics, polyethylene, etc. Some bearings are now made of special ceramic materials, and pump valves are made of polyethylene materials. These materials have a hard texture, and some applications can replace metal materials to make workpieces. During production and processing, their surface roughness also needs to be tested.
3. With the continuous strengthening and improvement of the technology and functions of roughness meters, as well as their in-depth promotion and application, more and more industries have been found to require roughness detection. In addition to mechanical processing and manufacturing, roughness evaluation is also required in the production and processing of power, communication, electronics, such as couplings on switches, integrated circuit semiconductors, and even stationery, tableware, and other products used in people's daily lives The surface roughness of human teeth needs to be tested.