The bitter taste of cucumber is a kind of physiological disease, mainly due to the accumulation of bittersin in the melon. The disease is affected by a specific temperature and humidity microclimate, so the incidence rate in the greenhouse is relatively high, mainly concentrated in the early flowering root melon and late flowering melon. First, the cause of the disease 1. Changchun Mickey and Shandong Mate are not resistant to bittersin, and bittersin is hereditary. Choosing bitter melon as a seed, the offspring will be affected. 2. Moisture control period of water, improper or physiological drought, are easy to form bitter. 3. Fertilizer cucumber absorption ratio of nitrogen, phosphorus, potassium should be 5:2:6, - high nitrogen fertilizer, easily lead to leggy, in the side, weak branches prone to bitter melon. 4. When the temperature is lower than 12°C, the physiological activity of the cells is reduced, so that the absorption of nutrients and moisture is suppressed, resulting in bitter melons. The temperature is higher than 32 °C for a long time, especially if it exceeds 35 °C. The respiratory depletion is higher than that of photosynthetic products. Malnutrition can also cause bitter melon. 5. Debilitating Plants Caused by the lack of light and the infestation of fungi, bacteria, and viruses, or the aging of plant physiological functions at the later stages of the development of bitter gourds. Second, prevention and control methods The selection of disease-resistant varieties is currently available on Jinza No.2, No.4 or Jinyan No.4. 2. Strengthen the ecological management of the greenhouse 1 moisture. The principle of watering is that shed soil is not poured. Watering should do see wet see dry. 2 temperature and humidity control. Combine agricultural measures such as watering and weeding, and then adjust the air outlet up and down so that the temperature in the morning is 25°C-30°C and the relative humidity is maintained at 75%; in the afternoon, the temperature is maintained at 20°C-25°C, and the relative humidity is maintained at 70%. 3 balanced fertilization. According to the nutrient required for each growth period of the crop, 50 kg of superphosphate or 50 kg of diammonium phosphate shall be applied to the planting furrow per gram of base fertilizer, and nitrogen, phosphorus and potassium shall be followed in full bloom (5:2:6). The proportion of fertilization, the late fertility to adopt foliar spraying potassium dihydrogen phosphate, to maintain the photosynthesis of functional leaves, prevent bitterness.

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Network Camera NVR CCTV Kits

The functional mode of NVR technology application is relatively flexible and can meet the functional requirements of today's video monitoring system to a large extent. The small NVR scheme with NVR technology as the core has the advantages of small scale, flexible operation, convenient use, economy and practicality. Its front end mainly supports 8-way 720P high-definition video image access with high-definition video camera, and then realizes the centralized management and real-time storage of high-definition video image information through NVR technology. In addition, this small NVR scheme can also support remote management of video images, preview analysis of video images, real-time upload of gigabit network interface video image data, local preview, video playback and other functions. The small NVR high-definition video scheme has a high overall cost performance ratio, simple system and high operational flexibility. This small NVR high-definition video monitoring system is widely used in the centralized video monitoring field in small areas such as companies, factories, family villas, offices, shops, supermarkets, etc.

With the further increase of functional requirements for high-definition video monitoring system, the video monitoring system is required to have the technical performance of expansion, cascade and standard ONVIF communication protocol. The HD cameras of different manufacturers and brands at the front end of the video monitoring system can be organically interconnected through NVR equipment. In this way, a unified functional integrated LAN can be built through NVR to achieve NVR cascade, expansion and mass storage in the video monitoring system. In addition, a centralized advanced application management technology platform is built at the back end through NVR expansion, which can uniformly manage and configure the NVR device group to achieve multi-user forwarding and various application function services (forwarding/management server group) within the region, mainly including: forwarding server, management server, storage database, on-demand server, advanced client application software and other functional modules. The medium-sized NVR high-definition video system is usually used in the medium-sized high-definition video surveillance projects with routes below 1000. Its advantages are that NVR can achieve distributed layout and centralized and unified storage, and its operation stability is high. The back-end technology platform carries out unified management and application, and can achieve multi-user and multi-level integrated and unified application services. The secondary medium-sized network mainly focuses on the urban video monitoring architecture of district, county or prefecture level cities. It realizes the storage of video image data and the centralized communication management of access to front-end equipment through NVR, thus realizing the storage, management, client video image preview, local decoding on the wall and other service application functions of front-end high-definition camera video. At the same time, it can also be authorized by the provincial video monitoring center, The video image information can be previewed, controlled and shared among clients of different levels of users, fully meeting the normal video monitoring function requirements of secondary users in cities such as prefectures, counties and cities.
On the basis of the secondary network structure, a large NVR high-definition video system is built by converging into the primary network through private networks, optical networks, and public service networks. The storage and forwarding services of the primary network are realized through the industrial control NVR, and the redundant and safe backup of the video monitoring system is realized at the same time. This distributed multi-level coordinated back-end centralized management network mode greatly provides the overall function and fault tolerance of the video monitoring system, highlights the ease of operation and reliability of the high-definition video monitoring system based on NVR technology, and meets the flexibility, multi-function performance, sharing Emergency handling and other functional requirements.

NVR technology has been widely promoted and applied in urban safe storage, national security and other engineering projects with its own advantages in many aspects. Driven by market and technology, NVR technology will become the mainstream technology in the field of urban security high-definition video surveillance, with very strong theoretical research and practical application prospects

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