The sudden drop in temperature needs to prevent the entry of grey mold
In the low-temperature and high-humidity greenhouse environment, vegetables are most likely to cause gray mold. The gray mold mainly begins to infect from the residual flower parts. Once outbreak, the disease will quickly spread, which will cause a large area of ​​reduced production. Therefore, early prevention and early treatment of the disease is necessary.
First, adjust the environment to prevent gray mold. Since the suitable temperature for the incidence of gray mold is 20°C~25°C and the relative humidity is more than 90%, it is necessary to prevent and control gray mold by increasing the temperature and humidity. During periods when the relative humidity in the shed is high, try to increase the temperature of the shed and avoid the temperature of the disease. In addition, it is also possible to reduce the humidity in the greenhouse by pouring small water under the membrane, covering the straw with rice straw, and other measures.
Second, pick flowers and spray spray. First pick flowers, pick up the residual flowers to reduce the incidence of gray mold, after picking flowers with watering cans to prepare 50% of 1000 times for puerarin, and then spray flowers to avoid the hidden dangers of picking flowers incomplete.
In addition, a stencil net smoking booth was used. Before the shed is closed, smoldering tobacco smoke is used. The dosage and the duration of smoking are determined according to the crops. For example, tomato can be used for 250 grams per mu and smoked for 8 to 10 hours; 200 mu for beans and eggplant, and smoked for 6 to 8 hours. Practice has proved that this method can effectively kill plant pathogens, soil and pathogenic spores on the walls, reduce spores of pathogens, and prevent diseases.
We may have ever heard of the Bullet Fixed Focus Camera/ Fixed Focus Bullet Camera HD/ Bullet Fixed Focus Journal Camera/ Fixed Focus Bullet Camera IR/ Fixed Focus Bullet Surveillance Cameras/ Fixed Focus Analog Bullet Cameras, so what is the Bullet Fixed Focus Camera? We know that the Bullet refers to the camera shape, so what about the Fixed Focus? Actually, the Fixed Focus refers to a type of the camera lens. Today let me introduce the camera lens for you.
The camera lens is the key equipment of the video system. The lens' quality (index) directly affects the overall index of the camera. The lens is equivalent to the lens of the human eye. As you know, if there is no lens, the human eye cannot see anything. That is to say, if there is no lens, then the output image of the camera will just be white without any clear image output; which is consistent with the principle of our home cameras.
Actually, there are many classifications for the camera lens. Today please let me introduce one classification for you---the classification according to the structure.
1. The fixed focus lens with the fixed aperture
The lens has only one focus adjustment ring that can be manually adjusted. Rotating the ring left and right can make the image on the CCD target surface clearest. There is no aperture adjustment ring, so the aperture cannot be adjusted, and the luminous flux entering the lens cannot be changed by changing the lens factors, but can only be adjusted by changing the illuminance of the shooting site. The structure is simple and the price is cheap.
2. The fixed focus lens with the manual iris
Compared with fixed focus lens with the fixed aperture, the fixed focus lens with the manual iris has an extra aperture adjustment ring. The aperture range is generally from F1.2 or F1.4 to fully closed, which can easily adapt to the illuminance of the shooting site, and the aperture adjustment is done manually. The illuminance is uniform and the price is cheap.
3. The fixed focus lens with the automatic iris
Compared with the fixed focus lens with the manual iris, the fixed focus lens with the automatic iris has an extra gear-driven micro motor on the iris adjustment ring, and a 3 or 4-core shielded wire is drawn from the drive circuit, then connected to the camera's automatic iris interface seat. When the luminous flux entering the lens changes, the charge generated by the CCD target surface of the camera changes accordingly, thenthe video signal level changes, and a control signal will be generated and transmitted to the automatic iris lens, so that the motor in the lens can perform the corresponding rotation to complete the task of resizing.
4.The electric zoom lens with the automatic iris
Compared with the fixed focus lens with the automatic iris, the electric zoom lens with the automatic iris two extra micro motors. One motor is connected with the zoom ring of the lens, and can control the focal length of the lens when it rotates; the other motor is connected with the focus ring of the lens, and it can complete the focus of the lens When it rotates with control from the former motor. However, due to the addition of two motors and an increase in the number of lens groups, the size of the lens has also increased accordingly.
All in all, it would be helpful to know about the camera lens if you want to know more about the Bullet Fixed Focus Camera and the whole video monitoring field.
Fixed Focus Bullet Camera HD, Bullet Fixed Focus Journal Camera, Fixed Focus Bullet Camera IR, Fixed Focus Bullet Surveillance Cameras, Fixed Focus Analog Bullet Cameras
SHENZHEN SANAN TECHNOLOGY CO.,LTD , https://www.sanan-cctv.com