The newly grafted fruit tree seedlings, due to the wound healing, have poor stress resistance and are prone to frost damage in winter. In order to ensure safe wintering of newly grafted fruit trees, the following technical measures should be taken.
1. Fill the frozen water timely. Before the soil freezes, the seedlings trails or furrows are ploughed with furrows or artificially ditchered, followed by pouring frozen water into the ditch, and the perfusion must be filled. Therefore, when the soil begins to freeze, it contributes to the soil insulation and maintains sufficient moisture in the soil to meet the water consumption of the fruit trees during the winter.
2. Root and neck soil. Before the freezing, the root of the grafted fruit tree seedlings is cultivated to a depth of 20 cm to prevent the roots from freezing, so as to facilitate safe wintering of the seedlings.
3. Set the cold barrier. According to the terrain of the nursery, use corn stalks before the soil freezes, place a windbreak every 23 seedbeds (or seedlings), or stack a mound about 50 centimeters high on the northwest side of the young seedlings for wind protection.
4 seedlings dry white. Take 5 kg of quicklime and 0.5 kg of salt and separate them with water. After mixing, add 0.5 kg of vegetable oil and 0.5 kg of lime sulfur to prepare a whitening agent. Brush or sprinkle on the seedlings before the soil is frozen to make the whole seedlings. The surface is white or gray, not only reflecting sunlight, preventing rapid temperature changes, enhancing cold resistance, but also effectively preventing and treating wintering pests on the trunk.
What is DVR Mini Camera
Dvr, which is called DigitalVideoRecorder in full, is a digital video recorder. Compared with traditional analog video recorders, dvr uses hard disk for recording, so it is often called hard disk recorder, also called DVR. It is a set of computer system for image computing, storage and processing. It has the functions of long-time video recording, recording, remote monitoring and control of images/voice and dynamic frames. DVR integrates five functions, including video recorder, picture splitter, PTZ lens control, alarm control, and network transmission. One device can replace a large number of devices in the analog monitoring system, Moreover, it has gradually gained advantages and popularity in terms of price.
The "digitalization" of DVR means that compression and storage technology is aimed at digital signals, rather than directly transmitting digitally encoded video images. Therefore, DVR must be deployed near the analog camera.
The function of DVR, with the increase of various voltage sensitive loads in the distribution network, puts forward higher requirements for power quality. However, due to system accidents in the power system, the voltage flicker, drop and other disturbances caused by the startup and shutdown of large equipment, lightning stroke and other principles are unavoidable. Moreover, in the current power grid, the ability to quickly restore power supply after power interruption is far from meeting the requirements of many sensitive loads. Therefore, it is necessary to provide users with stable and uninterrupted high-quality power when interference occurs. Dynamic voltage recovery (DVR) is the choice to solve the above problems today. DVR is connected in series to the feeder line that requires high-quality power to realize dynamic real-time voltage compensation for the line, so that the load end can get the desired high-quality power, and ensure the normal and uninterrupted operation of sensitive user equipment.
DVR Mini Camera,Cctv Camera System, Outdoor Waterproof NVR Set , Wireless Security Camera NVR, Cctv NVR Kit
DVR Mini Camera,Cctv Camera System, Outdoor Waterproof NVR Set , Wireless Security Camera NVR, Cctv NVR Kit
Shenzhen Fuvision Electronics Co., Ltd. , https://www.szsolarcamera.com