The crop fertilization season comes after the beginning of spring every year. Many growers use the method of compound fertilizer and urea to fertilize, but this method of fertilization is not scientific. Nitrogen fertilizer needed in early crops Crops need to consume a large amount of energy during budding and flowering in early spring, and nitrogen fertilizer is the main component of protein in crops. In the flowering period, the nutrients consumed by the crop accounted for about 70% of the reserves. After flowering, the long branches, fruit set, and young fruit cells divide, and a lot of nutrients are needed. This has caused the situation that the stored nutrients are far from enough, so fertilizer must be added before flowering and germination. Timely supplementation is most effective Nitrogen fertilizers should be used in the critical nitrogen requirement period and the maximum efficiency period of crops. Different crops require different critical fertilizer periods and maximum efficiency periods. They should be treated differently and applied rationally. For example, the critical nitrogen requirement of wheat, corn, and other gramineous crops is at the tillering stage and ear differentiation stage. The maximum nitrogen efficiency stage was wheat from jointing to booting stage, rice from tillering to jointing stage, corn at big bell mouth stage, and tomato at fruiting stage. Fertilize in early spring with water Take fruit trees as an example. If you want fruit trees to stop early and early, you must have sufficient nutrients in spring. However, the effective period of topdressing fertilizer in spring cannot be too long, otherwise the branches will grow continuously and affect flower bud differentiation and fruit expansion. Generally speaking, the effective period of topdressing fertilizer should not exceed 20 days. In general, the effective period of compound fertilizers is much longer than this, and water-soluble fertilizers are more conducive to the absorption of fruit tree roots, and the effect is faster. Pay attention to urea application in early spring Urea phthalamide nitrogen cannot be directly absorbed by crops. It must be converted to ammonium nitrogen by the action of microorganisms in the soil before it can be used. When the temperature is 10 ℃, the conversion time is 7-10 days, and at 20 ℃, it takes 4-5 days. In early spring, the ground temperature is generally low and the conversion time is long. Not only cause waste, but also cause late lodging, growth and affect flowering and fruit setting. 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