Rainy days, vegetable yellow leaves should pay attention
First, there are more cloudy days. More cloudy days, lower temperatures lead to vegetable root injury, affecting the absorption of nutrients, showing symptoms of deficiency. In addition, even the lack of light in the cloudy day, resulting in crop malnutrition, carbohydrates can not be converted, the leaves are thicker and smaller, the roots (especially the root tip) are injured, brown, no new roots. If the management of large fertilizers is carried out at this time, there are many roots in vegetables, and it is impossible to absorb nutrients normally. Vegetables are bound to suffer from deficiency. At this time, spraying foliar fertilizer is the most effective solution.
Second, the application of trace elements should not be used. In order to pursue high yields, some vegetable farmers have applied a large amount of fertilizer to the greenhouse, and neglected the application of trace elements, resulting in a general increase in nitrogen, phosphorus and potassium in the soil, and insufficient trace elements. Some vegetable farmers use excessive amounts of micronutrient fertilizers. Because of antagonism, roots absorb other elements and are inhibited, thus showing symptoms of deficiency.
Third, the concentration of soil solution in the shed is too high. Due to the large-scale use of chemical fertilizers by vegetable farmers, the soil solution concentration is too high, the root system of the plants is poorly developed, and sufficient nutrient supply plants cannot be absorbed to grow, and the plants exhibit deficiency syndrome.
Fourth, prevention is inappropriate. Some vegetable farmers see that the leaves of vegetables are yellow, and they think that they are lack of fertilizer, so they apply a lot of chemical fertilizers, and the results are counterproductive, leading to more and more serious diseases of vegetables. Therefore, the farmers should be given more guidance to distinguish the symptoms of various deficiency.
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The Network CCTV Wireless Security Camera
Compared with wired cameras, wireless security cameras are less invasive to your home, so they are easier and faster to set up. No need to drill through walls or ceilings. Wireless cameras are also more flexible than wired systems because they are not as constrained as wired systems.
The biggest disadvantage of a wireless Camera System is that it is completely dependent on the strength of your Wi-Fi connection. Any interruption or weak signal can mean that you may lose connection to the system, resulting in the loss of the film, which can be critical
Best wireless outdoor security camera overall Ring Floodlight Cam Wired Plus.
Best wireless outdoor security camera: Fuvision 4G PTZ WiFi Camera
Best outdoor security camera : 4g Outdoor Wireless Camera
Working principle of camera
The working principle of the camera is to reflect the light to the sensor, convert the signal captured by the sensor into a digital signal, and finally send it to the computer to display the image. Then the camera can capture the static and dynamic images in the picture.
The sensor of the camera is the most important part. It can capture light and convert it into electrical signals. There are many types of sensors, the most common are CCD and CMOS sensors, which can be used to capture images.
The internal circuit of the camera will convert the signal captured by the sensor into a digital signal and send it to the computer. The computer uses these signals to display images, or it can save images to the hard disk drive.
If the camera is not connected to the network, it will not be able to achieve real-time monitoring, but the camera will still work and save the pictures and videos taken. If we need to view, we can only remove the memory for viewing.
The smart camera can also support remote monitoring. You can remotely view the real-time image of the camera through your mobile phone or computer. Users can view the image of the camera anytime, anywhere, to better protect the security of your home or office.
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