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1, watermelon and rootstock seeds for low temperature treatment, enhance the cold resistance of seedlings soaked seeds will germinate seeds, placed in a frozen environment around 0 degrees for 24 hours, and then placed under appropriate temperature conditions germination, when the seeds exposed white, Treat it with -1 degree every day for 12-18 hours. Turn to 18 degrees for 12-6 hours for a total of 3-5 days, and then all parties will germinate at moderate temperature.
2. Strengthen the management after grafting: In the first week after grafting, the temperature of the canopy is kept at 20-30 degrees. When the temperature is lower than 18 degrees at night, the temperature should be artificially increased. Grafting seedbeds should be tightly sealed within 3-6 days. The relative temperature within 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.
3. Strengthen the management of severe weather: The management during bad weather such as continuous yin, rain and snow, and strong cold current is an important part of the success of breeding. Pay attention to listening to the weather forecast and take thermal insulation measures before the cold spell. 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 should be carried out slowly. Otherwise, if the seedlings are found to be wilting due to flashing seedlings or even down seedlings, shading should be covered immediately. Repeat this several times until it is not wilting. Then all the grasshoppers were uncovered and then entered into normal management.
4, 7-10 days before planting, increase ventilation, cooling and hardening seedlings: 15-20 degrees during the day, within the limits of melon seedlings from frost damage, try to reduce the night temperature, can be reduced to 8-10 degrees, so that the melon seedlings Adapt to the environmental conditions after planting.
Improve the heat preservation measures for nursery sheds, replace polyethylene film with poly vinyl cyanide non-drip film, improve heat preservation and no performance, increase shed temperature by 1-2 degrees, and provide temporary heating such as fire wall or heating furnace in sheds. equipment. Artificial warming is performed when necessary.