1.Improve the insulation and temperature-raising measures of nursery sheds, replace polyethylene film with poly vinyl cyanide non-drip film, greatly improve the heat preservation and no performance, increase the shelf temperature by 1~2°C, and set fire wall or heating furnace in the shed. Temporary heating equipment. Artificial warming is performed when necessary.
2. Watermelon and rootstock seeds are treated at low temperature to enhance the cold resistance of the seedlings. Seeds that will germinate after soaking are placed in a frozen environment around 0°C for 24 hours, and then germinated under appropriate temperature conditions. When the seeds are white, Daily treatment at -1°C for 12-18 hours. Turn to 18 °C for 12 to 6 hours for a total of 3 to 5 days, and then all parties germinate under appropriate temperature conditions.
3. Strengthen management after grafting: In the first week after grafting, it is the stage of wound healing, and the temperature of the shelf should be maintained at 20~30°C. When the temperature is lower than 18°C ​​during the night, the temperature should be artificially increased. Grafting seedbeds should be tightly sealed for 3 to 6 days. The relative temperature in the bed should be kept 100%. The first 3 days should be fully shaded and only weak light scattering can be used. Gradually see the light, gradually ventilation after 6 days, after 7 days to remove the shade and increase ventilation. The grafted seedlings were adapted to the normal seedbed environment.
4. Strengthen the management of severe weather: Pay attention to listening to the weather forecast and take measures to increase the temperature of the insulation before the cold current. In rain and snow, two layers of film must be placed on the grasshopper. When it is cloudy, increase the lighting as much as possible without causing freezing damage. If the bed temperature drops after exposing, you should uncover the straw and cover it before 3 pm. If the bed temperature drops slightly, follow the cover. Do not expose squats for a few days. When there is rain and snow, pause in the rain and snow to expose the gaps. With prolonged lack of light, fluorescent lights can be used to artificially fill light. After a long period of haze and sunshine, the exposing process must be carried out slowly. Otherwise, it is easy to cause flash or even down seedlings. If the seedlings are found to be wilting, they should be covered with shading immediately. Repeat this several times until it is not wilting. Then all the grasshoppers were uncovered and then entered into normal management.
5. 7 to 10 days before planting, increase ventilation, cooling and hardening seedlings: during the day 15 ~ 20 °C, in the melon seedlings from the limit of frost damage, try to reduce the night temperature, can be reduced to 8 ~ 10 °C, so that the melon seedlings Adapt to the environmental conditions after planting.
Welding mask is a type of headgear used when performing certain types of welding to protect the eyes, faceandneck from flash burn, ultraviolet light, sparks, infrared light, and heat.
welding
masks are most commonly used with arc welding processes such as
shielded metal arc welding, gas tungsten arc welding, and gas metal arc
welding. They are necessary to prevent arc eye, a painful condition
where the cornea is inflamed. welding masks can also prevent retina
burns, which can lead to a loss of vision. Both conditions are caused by
unprotected exposure to the highly concentrated ultraviolet and
infrared rays emitted by the welding arc. Ultraviolet emissions from the
welding arc can also damage uncovered skin, causing a sunburn-like
condition in a relatively short period of welding.
Welding Mask,Welding Face Shield,Pp Welding Mask,Flip Type Welding Mask
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