Rice needs a certain amount of nitrogen, phosphorus, potassium and trace elements at each stage of its growth. Once deficient, it will affect growth and development and lead to reduced yield. After the deficiency, the symptoms often appear on the leaves. Therefore, during the growth of early rice, the color and shape of the leaves and plants should be frequently observed to distinguish the type of deficiency, and immediate remedy.
1. Nitrogen deficiency and yellowing. Nitrogen deficiency in rice seedlings generally begins to yellow uniformly from the old leaves downward, gradually extending from the basal leaves to the heart leaves, and finally the whole plant falls yellow. Nitrogen deficiency can cause rice dwarf, with different extension of leaf blades, late and thin tillers, short, narrow, erect leaves with yellowish green, resulting in short plants, few tillers, premature senescence, small ears, and incomplete grains.
Remedy: At this time, nitrogen fertilizer should be added, and 5-7 kg of urea is applied per acre. If the nitrogen deficiency is severe, the application amount should be slightly increased, and the phosphorus and potassium fertilizer should be applied.
Second, phosphorus deficiency and redness. Early rice seedlings grow significantly slower after turning green, tillering is delayed or not tillering, or the symptoms of stiff seedlings appear after turning green, and the leaves are thin and erect, and in severe cases, the leaves are curled and folded along the midvein, the leaves are dark green and dull, and the tips of leaves Blue-purple, dark green with gray-purple rice plants when viewed from afar; rice plants are clustered, short and thin; roots are tight, the new roots are few, and complications of hydrogen sulfide poisoning sometimes occur. Phosphorus-deficient rice tends to decline before aging.
Remedial measures: topdressing in shallow water, spraying with higher phosphorus-containing foliar fertilizer (such as imported Nuofeng: 46 phosphorus and 30 potassium content), implement shallow irrigation and frequent irrigation on pipe water, and repeatedly expose the field to increase soil temperature To enhance the ability of rice roots to absorb and metabolize phosphorus, when new roots emerge, 3-4 kg of urea per acre is promoted to grow.
Third, potassium deficiency bacterial wilt. Early rice was deficient in potassium, although the roots could turn green after transplanting, but the leaves were yellow with brown spots, small red spots on the tip and edge of the old leaves, and finally the leaves gradually became reddish brown and died from the tip. Every time a new leaf grows, the disease of an old leaf increases. In severe cases, only a few new leaves remain green in the whole plant, which looks like a fire in the distance. The entire root system of the diseased plant was yellow-brown to dark brown with few new roots. Potassium-deficient red withering occurs mainly in cold-soaked fields, rusty paddy fields, and rotten mud fields of early rice.
Remedy: Drain immediately, apply 100-150 kg of plant ash per mu; or apply 4-6 kg of potassium chloride per acre, put dry field water before fertilization, and apply strip or hole application to the soil layer 5-10 cm deep; Or spray 1% potassium chloride or potassium sulfate solution on the foliar surface, and apply nitrogen fertilizer for interstitial irrigation to increase the capacity of absorbing fertilizer.
Fourth, zinc deficiency clusters. Early rice seedlings deficient in zinc appeared greenish yellowish albino in the middle veins of the lower leaves, and had reddish brown spots and irregular plaques, and then gradually expanded into reddish brown spots. From the tip of the leaves, they became reddish brown and withered. The lower and upper leaves appear in turn. The emergence rate of the diseased plant slowed down, the new leaves were short and narrow, and the new leaves faded, especially the yellowish white near the midrib of the base. Pillows of severely diseased plants have shortened or misplaced leaves, and are obviously dwarfed. The sheaths are longer than the leaves, and the joints are difficult to join.
Remedial measures: Drain the land immediately, increase aeration, and promote root development. When rice seedlings show symptoms of zinc deficiency, zinc fertilizers with good effects (such as Unico zinc imported from Italy) should be sprayed or zinc sulfate be formulated into a 0.1% -0.2% aqueous solution for foliar spraying. For mu, use 50-60 kg of prepared zinc sulfate fertilizer solution, spray once every 7 days, and spray twice.
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What is 4G PTZ WiFi Camera
Camera, also known as computer camera, computer eye and electronic eye, is a video input device, which is widely used in video conference, telemedicine and real-time monitoring. Ordinary people can also talk and communicate with each other through the camera on the network with video and voice. In addition, people can also use it for various popular digital images, video and audio processing.
Smart cameras are also called smart security cameras. Security is one of the main functions of smart cameras at present. When there is something happening at home, the camera will immediately push a message on the mobile phone to remind users. According to the statistics of the big data of Aurora, as of February 2019, the number of users of smart camera APP in the industry was 49.81 million, an increase of 44.9% over the same period last year. This shows that in the past year, people's demand for remote home and store watching has shown an upward trend, and smart cameras have also become a common household device.At present, the functions of smart cameras mainly include video monitoring, voice dialogue, security alarm and video review.
Video surveillance
Video surveillance is the core and basic function. The current intelligence is that the mainstream resolution of cameras is 1080P HD, which requires a high level of network. Most home cameras transmit data through WiFi, which is convenient to move. Some stores also install such cameras, which are mainly used to monitor the main points such as the cash register. This kind of camera that does not need to move can use the network cable, and the signal will be more stable.
Voice conversation
Most cameras on the market are equipped with the function of voice conversation. Users can directly have voice conversations with their families through the APP. Of course, although many devices on the market support this function, noise elimination, uneven echo and other situations still occur frequently and need to be improved continuously.
Security alarm
The security alarm function is mainly used to record vibration, special noise and other vibrations, and alarm through APP.
Video review
At present, smart cameras on the market all provide the function of video review, but most of them only provide the function of alarm review, that is, the video recorded after the alarm occurs can be reviewed, and the rest of the time can not be viewed, and it is a paid function. Few manufacturers can provide uninterrupted video retrieval function. The reason is simple: the cost of video storage server is too high. Video belongs to large flow files. If you want to achieve uninterrupted recording, storage and review, the cost will be many times or even dozens of times higher.
4G intelligent camera
The deployment of wired network is troublesome or the coverage of WIFI is limited. For example, security monitoring of mature commercial offices or new indoor and outdoor blank areas in residential areas, video monitoring is required for outdoor construction sites, and 4G intelligent cameras are required for the deployment of wired network is troublesome and scattered.
The 4G intelligent camera, also known as 4G camera and IPC, is mainly used for security video surveillance. Its feature is that the 4G communication module is built into the universal surveillance camera, allowing the camera to be directly connected to the network through the base stations of the three operators, breaking the limitations of the original deployment of network cables or WIFI connection, so as to achieve the purpose of remote monitoring.
Professional 4G PTZ WiFi Camera manufacturer is located in China, including Full Color Night Vision Two Camera,Smart Wifi Zoom Cctv ,360 Degree Ip Wireless Camera, etc.
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