All kinds of fruits and vegetables cultivated in spring often have weak light when they are planted, and the ground temperature is low. After the planting, the seedlings are slow and slow. In advance, the shed film is added to increase the heat insulation of the grasshopper. That is, when the outside temperature has risen, the grasshopper is uncovered. When the temperature in the afternoon shed reaches 30°C or above, ventilation is performed for a short time, and the opaque cover is covered at 2-3 o'clock in the afternoon to increase the ground temperature.
When the 10 cm ground temperature is stable above 12°C, it is best to start cultivation above 16°C. At the same time, it depends on the weather forecast. After the cold has been selected, it will be planted on sunny days. It is best to use small water or dark water when planting. The specific operation is to pour small water in the ditch. When the water does not completely infiltrate, put the seedlings into the cultivation ditch according to the plant spacing. After waiting for the water to completely infiltrate, bury the soil in the root base of the seedlings and cover the soil with the original seedling soil. Just cover, do not buried too deep to prevent slow seedling slow.
If the weather is foggy or cloudy when planting, you can pour burrowing water when you plant the seedlings, or ditch the seedlings into trenches without trenching, and keep the ground temperature stable for more than 15°C for 2-3 days. Choose sunny noon temperatures. When it is relatively high, seal the hole (cover groove), after 3-5 days, grow a new leaf and then pour a small amount of water to meet the normal growth and development of the crop. Spray it once before watering to prevent dead trees. To reduce the occurrence of epidemics, spray medicine must be sprayed on the front and back of the seedling blade and the base of the seedlings on the ground, spraying strict spray.
Raise the temperature in the greenhouse on or after the day of watering. In the morning, when the temperature rises to 23°C, conduct a short-term air change for 10-15 minutes. Close the vents to increase the temperature. When the temperature rises to 32°C, ventilate again. Sometimes it is When the cloudy weather temperature rises to less than 30°C, the air exchange can only be performed at noon for a short period of time. In the afternoon, when the temperature is lowered to 24°C, another air exchange is performed. The purpose is to eliminate humidity and increase the indoor carbon dioxide concentration to meet the needs of crops. Normal growth.
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