At present, the annual average utilization rate of chemical fertilizers in China is only 30%, of which the utilization rate of nitrogen fertilizer is generally 30%-50%, the utilization rate of phosphate fertilizer is generally 10%-15%, and the utilization rate of potash fertilizer is generally 40%-70%. Obviously, effectively increasing the utilization of chemical fertilizers is crucial to reducing production costs and increasing production and income. Let's take a look at the soil fertilizer experts to explain the scientific application of fertilizer. The sales price of urea is relatively high. Farmers' friends should follow ten technical points in the application of urea, so as to save costs and to exert the fertilizer efficiency of urea. First, consider the major crops. In the application, crops with large planting area and high economic value (such as wheat and corn) should be considered, while for buckwheat and other minor crops, they can be appropriately applied or not applied according to their own economic conditions. To increase the role of fertilizer production. Second, used as base fertilizer or top dressing. Urea is suitable for use as a base fertilizer and top dressing, and is generally not used as a fertilizer. Because urea easily destroys the structure of the protein and denatures the protein, it affects the germination of the seed and the growth of the root system of the seedling, which can cause the seed to lose its ability to germinate when severe. Third, used as autumn fertilizer. For dryland, the effect of urea fall application is much better than that of spring application. According to relevant experiments, under the same conditions, autumn planting can increase the utilization rate of urea by more than 10.8% over the spring season. If urea is used, then the application of organic fertilizers and other fertilizers will have better results. Fourth, for top dressing. Urea is an amide fertilizer. It is organic and neutral. It contains no auxiliary components. It has very small burns on stems and leaves of crops. It has a small urea molecule and is easy to penetrate cell membranes. Urea itself has hygroscopicity and is easily absorbed by the leaves. When the leaves penetrate, there are few cases of plasmolysis, and even if they happen, they will recover quickly. So urea as top dressing is better than other nitrogen fertilizers. The concentration and time of urea spraying outside the root varies with the type of crop. Under normal circumstances, each application of urea 0.5-2.5 kg; once every 4-5 days, 2-3 times. Fifth, ahead of time. After urea is applied to the soil, it is first hydrolyzed to ammonium bicarbonate by the action of microorganisms in the soil so that it can be absorbed by the crop roots. Therefore, it should be pursued in advance. 6. Deeply cover the earth. The final product of urea decomposition in soil is ammonium carbonate. Ammonium carbonate is very unstable and decomposes in the soil or soil surface to form free ammonia, which is easily lost. Therefore, when applying urea, the soil should be deeply applied, and the depth of soil covering is generally about 10 cm. 7, as far as possible after the rain. Urea moisture absorption performance is good, in the implementation of topdressing in drylands should be arranged as far as possible after the rain, so that the fertilizer dissolves quickly, is adsorbed by the soil, but also can make part of the fertilizer through the leaves to absorb, improve fertilizer efficiency, reduce losses. Eight, morning or evening application. Urea and other nitrogen fertilizers, urea application time should be in the morning or evening, it is best to rain or cloudy days, should not be used in sunny (or noon) when the temperature is higher. Nine, with other chemical fertilizers. Urea is a unit fertilizer, which should be used in combination with phosphate fertilizer or other fertilizers to meet the needs of crops for various nutrients, but also to play a role in helping between fertilizers. Ten, and organic fertilizer application. The combined application of urea and organic fertilizers is an effective measure to increase the efficiency of urea fertilizers, and can be used to complement each other, reduce urgency, improve fertilizer efficiency, save fertilizers, promote microbial activities, improve crop nutrient conditions, reduce production costs, increase production, increase income, etc. In order to improve the economic efficiency of fertilizers. Farmyard manure is best with high quality pig manure. Under normal circumstances, the ratio of urea to pig manure is 1:1.9. BGO PET CT,Large Extended Axial Fov,Sipm Technology Material,Positron Emission Tomography MinFound Medical Systems Co., Ltd , https://www.minfoundmed.com