In the winter, snowfall often occurs. Occasionally, there will be large snowfall. Vegetables grown in greenhouses will have different degrees of freezing damage. How to prevent freezing damage and remediate damaged greenhouse vegetables? The following measures are now available for reference. 1. Uncover grasshoppers and quilts at the right time. As far as possible, expose the grass cover and quilts as early as possible (including various greenhouse insulation facilities). The time for uncovering the grass should be based on the temperature of the greenhouse after the grass is uncovered. The time for covering the grass should be determined according to the season and the indoor temperature. The minimum temperature is between 0 °C and -15 °C, and the temperature should drop in the solar greenhouse. Cover the grass to 15 ° C ~ 17 ° C; the lowest temperature in the season below -15 ° C, should be covered in the solar greenhouse when the temperature drops to 17 ° C ~ 19 ° C. Solar greenhouses with poor insulation should be covered earlier. On sunny days, the grasshoppers should be uncovered early, and try to extend the time for vegetables to see the light; in the snowy days, according to the external temperature conditions, the grasshoppers can be uncovered at noon for a short time, so that the vegetables can be exposed to scattered light, and the grass cannot be uncovered for several days. thatch. After continuous snowy weather, it suddenly turns fine. It is necessary to pay attention to the interval and alternately revealing it. It is not possible to uncover all the grasshoppers immediately, in order to prevent the leaves of the crops from losing water and wilting under strong light. If the leaves are found to be wilting, they should be covered in time to remove the grasshoppers. After the plants are restored, they will be gradually removed. 2, pay attention to scientific fertilization and irrigation. In the winter, strict water management is required. In the season when the minimum temperature is below -15 °C, it is generally not possible to water. It is necessary to choose a sunny day to pour water in the season with a minimum temperature of -10 °C to cover the film. If the vegetables are short of water, you should choose the cold current just after the weather is fine, use the drip irrigation under the membrane or the small water under the membrane to avoid lowering the ground temperature. In the deep winter festival, the temperature in the greenhouse is low, the root absorption capacity of vegetables is weak and the growth and development is slow. Soil topdressing should be carried out as little as possible; however, foliar topdressing can be carried out properly to alleviate the growth and poor growth of vegetables due to low temperature and low light. 0.3% potassium dihydrogen phosphate plus 0.3% calcium nitrate and 1% glucose solution were sprayed on the surface. After the warm air in the spring and early spring, increase the number of watering and fertilization. 3. Strengthen moisture control and disease prevention. Deep winter or continuous low temperature rain and snow weather, the greenhouse air humidity is large, easy to induce disease, should be ventilated and drained at noon for a short time to control the occurrence of diseases; pay special attention to the indoor temperature range of 15 ° C ~ 25 ° C air humidity control below 90% . After the onset, aerosols and dusts can be used to prevent uniform application and avoid excessive humidity in the greenhouse. 4. Properly control the number of results. Continued low temperature rain and snow weather, plant growth and development is weak, early harvesting of fruit and appropriate thinning and fruit thinning, so as not to increase the burden on the plant, make the plant fertility weaker, reduce the ability to resist stress. After the weather, it will gradually be transferred to normal management. 5, pay attention to strengthen the defense of the storm and snow cooling and disasters. Strengthen the prevention of strong winds. When the membrane is buckled, press the film with a special laminating film. After the cover is covered in the evening, press two stainless steel cables with the cloth cover in the east-west direction to prevent the night grasshopper from blowing up with the outer film. In the windy days, the vents and doorways are sealed to prevent the wind from blowing into the shed to blow down the shed film to cool down. Strengthen the prevention of heavy snow, prepare the spare column in advance, and in case of heavy snow, replenish the column in time to prevent collapse of the greenhouse; medium and small snow can clean the snow after the snow, but the heavy snow should follow the sweeping snow to prevent the snow from falling too thick. Greenhouse; timely clear the snow around the greenhouse, and clear the ditch to prevent snow damage. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone 1000Hz High Frequency LiDAR System JRT High Frequency Range LiDAR Sensor is 2021 new product, that's a low-cost tof sensor but High frequency (up to 1000Hz). With 5cm high accuracy, the LiDAR Module can measure 80m.
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