The symptoms of strawberry deficiency are different at different stages of growth. The external morphology of nitrogen deficiency changes with leaf age and nitrogen deficiency. Young leaves or immature leaves, when nitrogen is insufficient, the leaves are more Green, vigorously growing leaves turn green from the fading to yellow, the petiole and calyx of the old leaves are reddish, the leaves become green and red, and develop from the outside to the inside, and some of the whole leaves are bright red or orange, and the fruit is small and light. Phosphorus-deficient plants have smaller leaves, darker green leaves, and slower growth. Flowers and fruits are also smaller than normal-grown strawberries, and fruit is occasionally bleached. Severe phosphorus-deficient strawberries, some plants appear black leaves with a shiny, lower leaves pale pink to purple. The leaves of the plants lacking potassium appear dark brown and dry. Some of them develop into burns. Some develop towards the center between the veins of most leaves, some from leaf to petiole become dark and become dry or necrotic, and the fruit color is dark. Soft texture, light taste. Calcium-deficient plants have few root hairs, slow growth, and frequent occurrence of leaf char in the fertility process. Symptoms are leaf shrinkage, leaf color chlorosis, light green or pale yellow boundaries, and brown spots on the petiole of diseased leaves. , syrupy water droplets often overflow, the lower leaves turn from light green to yellow and then dry.
In view of the above analysis of the symptoms of strawberry deficiency, in order to improve the yield and quality of strawberries, the following countermeasures should be taken in the application of fertilizers.
Pay attention to the need for balanced fertilization of potassium fertilizer, followed by nitrogen and phosphorus, the third is calcium, of course, the need for adequate trace elements, the implementation of protective cultivation, the ratio of nitrogen, phosphorus, potassium demand is 1.7:1:2.2 The proportion of nitrogen, phosphorus, and potassium needed for open cultivation is 2.9:1:3.9. Both types of cultivation methods reflect high sensitivity to potash fertilizer. Therefore, it should be used as a reference for balanced fertilization. .
To use organic fertilizer as basal fertilizer, the growth period of strawberries is longer, the yield is higher, and the market demands high quality. When applying fertilizers, the farmhouse manure, barnyard urine, and manure urine should be the main choices. 5000 kilograms, or 50 to 75 kilograms of cake fertilizer, with 15 kg of multi-component compound fertilizer or 50 to 75 kilograms of organic compound fertilizer, and 10 to 15 kilograms of compound fertilizer. Acidic soil should increase calcium, apply lime or plaster 100 jin per mu.
It is necessary to see if the strawberries after the top dressing of the seedlings have high requirements for inorganic nutrition. Before the first flowering, 10~15 kg of multiple compound fertilizers should be chased, and about 5 kg of urea or about 250~300 of human wastes should be traced back after the deficiency of nitrogen. Kg, phosphorus-deficient topdressing superphosphate 10 ~ 15 kg, potassium topdressing potassium sulfate 7.5 ~ 10 kg. Another can be sprayed 0.2% ~ 0.3% of potassium dihydrogen phosphate solution 2 ~ 3 times.
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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