Improve the heat preservation and heating measures of the watermelon nursery shed, replace the polyethylene film with a polyvinyl cyanide non-drip film, which greatly improves the heat preservation and performance, and can increase the shed temperature by 1℃~2℃. The shed should be equipped with temporary fire walls or heating furnaces. Heating equipment. Manually increase the temperature when necessary.
Strengthen seedling management
After grafting, spray 800 times of the new high-lipid film in time to prevent the invasion of airborne pathogens. The wound is healed within 1 week of grafting. The temperature in the shed should be kept at 20℃~30℃. The grafted seedbed should be tightly sealed for 3-6 days to keep the bed. The internal relative temperature should be completely shaded for the first 3 days, and only weak scattered light can be passed through. The light will be seen gradually on the 4th day, and the ventilation will be gradually increased after 6 days. After the 7th day, the shade should be removed and the ventilation rate should be increased, and sprayed at appropriate time Shixin high-lipid film can prevent pathogen infection, improve the ability to resist natural disasters, increase the intensity of photosynthesis, and adapt the grafted seedlings to the normal seedbed environment.
Strengthen severe weather management
Management during periods of severe weather such as continuous overcast, rain and snow, and strong cold currents is an important part of the success or failure of seedling cultivation. Pay attention to the weather forecast in winter, and take measures to keep warm before the cold current arrives. In rain and snow, two layers of film must be covered on the grass thatch. When it is continuously cloudy, increase the light as much as possible without causing freezing damage. If the bed temperature drops after uncovering the thatch, you should uncover the thatch and cover it before 3 pm. If the bed temperature drops slightly, the cover can be removed. Do not leave the thatch for a few days. When there is rain or snow, you must uncover and cover the thatch with the rain and snow. If there is insufficient light for a long time, fluorescent lamps can be used for artificial lighting. Uncovering thatch after a long period of overcast weather should be carried out slowly, otherwise it is easy to cause flashing or even falling. If the seedlings are found to be wilting, they should be covered with shade immediately, and then they should be exposed after the seedlings return to normal. Repeat this several times until it does not wither. Then uncover all the grass thatch, and then enter the normal management.
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