For many farmers, fertilization can be skillful and has experience to follow, but it is not so simple to truly achieve scientific and reasonable fertilization. Recently, the reporter interviewed Shi Chunxi, a researcher at the College of Plant Protection, Northwest A & F University. He said that scientific fertilization pays attention to the "three factors", that is, improving fertilizer efficiency, using the right method, and adapting to local conditions. Only in this way can fertilization be effective. A. How to improve fertilizer efficiency Spreading and stripping Shi Chunxi told reporters that spreading is generally used to apply basal fertilizer to farmland before planting crops, or deep, strip, and acupoint applications cannot be used during the growth of higher-density crops. The fertilization method can be evenly distributed to the soil cultivation layer, which is beneficial to the early absorption of the root system of the crop. The strip application is to use layered seeding before planting the crop, or after the crop is planted, the ditch is about 5-10 cm deep, and the soil is covered after application. Rotary fertilization is suitable for perennial woody crops. Generally, the trunk is used as the center of the circle, and a wheel-shaped fertilization ditch is excavated along the corresponding field surface of the above-ground canopy margin. After fertilization, it can also be covered with soil. The crescent-shaped ditch with a certain length of rice can also be used in the round area under the tree crown in combination with cultivated field loose soil when applying a large amount of organic fertilizer in winter. Leaching dissolves fertilizer in water to form a fertilizer solution, and infiltrates the soil surface where crop roots are concentrated. For phosphate and potassium fertilizers, base fertilizers should be used mainly because of their low mobility. It is not appropriate to use leaching. A small part can also achieve the purpose of top-root fertilizer application. Spraying is mainly used for trace element fertilizers, and the amount is relatively economical, which can avoid soil fixation, fast nutrient absorption, high efficiency, easy to control concentration, reduce pollution, and foliar spraying potassium dihydrogen phosphate solution when the root absorption capacity of the crop is weak in the later stage It can supplement phosphorus and potassium nutrients, which can increase grain weight and increase yield. Shi Chunxi introduced that the application method of flushing fertilizer with water is also called “rush fertilizationâ€. Generally, it is a kind of topdressing that provides supplemental nutrition during the rapid growth of crops. Since it is supplementary fertilization, it cannot replace the main fertilization methods such as base fertilizer. Ammonium sulfate and ammonium nitrate, as well as potassium chloride, potassium sulfate, and potassium nitrate in potassium fertilizer can be fertilized by flushing. "Phosphate fertilizer should not be applied because it dissolves very poorly after dissolving, it is easy to be fixed and cannot penetrate into the root layer with water." Shi Chunxi emphasized that the best application method of phosphate fertilizer can only be buried in the soil in layers to improve it. Its utilization. At the same time, high-concentration compound fertilizers or insoluble solid organic fertilizers and microbial preparations are not suitable for flushing. C. Choose fertilizer according to local conditions Soils such as sandy soil should be applied with more organic fertilizers, such as soil mixed fertilizers, straw returned to the field, or green manures should be pressed and fertilized in a timely manner to gradually improve soil properties. Organic fertilizer applied to clay must be fully decomposed and matured. Topdressing chemical fertilizers should be applied well in advance, and it is advisable to "eat more and eat less", reduce the number of fertilization, and avoid excessive application of nitrogenous fertilizer in the later period to prevent crops from becoming stale. In addition, plow soil should be cultivated regularly to improve soil aeration. The loam should be combined with long-acting and short-acting fertilizers to timely meet the demand for fertilizers at different growth stages of the crop; organic fertilizers and chemical fertilizers should be used to fertilize the soil and use both nutrients; and a large amount of fertilizers should be combined with micro-fertilizers to provide crops with timely Of various nutrients. Disclaimer: Some articles on this website are transferred from the Internet. If third party legal rights are involved, please inform this website to deal with them. phone
Video door-phone (also known as video door entry or video intercom) is a stand-alone intercom system used to manage calls made at the entrance to a building (residential complex, detached family home, workplace, etc.) with access controlled by audiovisual communication between the inside and outside. The main feature of video door entry is that it enables the person indoors to identify the visitor and, if (and only if) they wish, engage in conversation and/or open the door to allow access to the person calling.
The following product is the best-selling and most cost-effective video door phone in our factory,
It adopts a 4.3-inch high-definition screen and an aluminum alloy body, and is equipped with led light. It has night vision function and can clearly monitor the outdoor environment and make video calls with visitors even in the dark; physical button operation, classic design, no Easily leave fingerprints and keep your device clean and tidy. It can be used in multi-apartment systems.
The product parameters of 888QZJ4A are for your reference:
1. 4.3 inch 720 HD display TCP/IP Intercom system
2. Calling, intercom, unlocking, monitoring
3. High quality aluminium alloy frosted panel + physical buttons
4. Digital camera, stable and clear image shooting
5. Night vision and bright light compensation function
6. Full duplex voice intercom, comparable to ordinary telephone intercom
7. Elevator linkage function, connect the security system
8. LINUX system platform architecture, system simplification and stability
9. LPDDR3 1 GB memory, standard EMMC 8 GB storage expandable
10. RJ45 standard ethernet interface all-digital design
11. Low power consumption technology solution, saving energy and long life span
12. Dimension:400*140*51(mm)
13. Install method : Wall/flush install (390*130*46 mm)
14. Image/video advertising playback (advertising can be customized)
15. Door opening:IC/ID card/ password/call the Indoor Monitor or center management machine unlock
We are a factory specializing in the production, manufacture and research and development of video door phones for 11 years. We are located in the beautiful coastal city - Zhuhai. We have our own R&D team, we can provide professional products and services. We have different systems of video door phone for different customers and markets, for example, IP video door phone, 2-wire audio door phone, 4-wire video door phone and wireless doorbell, if you are interested, please feel free to contact me, I can send our catalog to your email.
Multi Video Door Phone,Video Door Phone Intercom System,Video Phone Doorbell,Video Door Calling System Zhuhai Mingke Electronics Technology Co., Ltd , https://www.zhmkdz-electronics.com
B. What fertilizer should be used for fertilizing? 
Grasping the "Three Elements"