At present, with the advent of cold air, the management of greenhouse vegetables is very intense. In order to reduce the occurrence of frost damage in greenhouses, management work such as insulation in the shed should be strengthened.
First, the film is warmed
How to timely cover the film before the cold current invasion is the most concerned issue for the vegetable farmers. Generally, after the transplanting, the three-layer membrane is covered, and when the temperature is kept too low, the small arched membrane is covered with a non-woven fabric, an old membrane and the like, and the inside of the apron membrane is increased in straw insulation. At the entrance of the shed at both ends, several membranes should be added as "door curtains" to prevent the cold wind from directly entering the door when opening the door, which acts as a wind shield.
Second, strengthen management
At the same time, taking measures to keep warm and keep out the cold, it is also necessary to uncover the film ventilation according to the weather conditions and adjust the temperature and humidity reasonably. When the temperature rises around 10 noon on a sunny day, it is necessary to uncover the film in time to increase the light. If the temperature is not high on a cloudy day, the film may be peeled off properly, but it should be noted that the film thickness should not be too large and the time should not be too long.
The pest control management work of greenhouse vegetable crops should also keep up with the uniform spray of 800 times liquid per acre of new high-fat film, which can prevent disease, inhibit pests and diseases, and can resist drought and moisturize, keep warm and protect.
The phenomenon of falling flowers, deciduous leaves and fruit drop of pepper is more serious. It can be adjusted by spraying “Chilli peppers†to make the peppers thicker, speed up the coloration of peppers, preserve flowers, preserve leaves and preserve fruit. For underground fruit crops such as sweet potatoes, potatoes, radishes, etc., spraying the fruit before the flowering, young fruit, and fruit expansion period to improve the fruit expansion, promote the expansion of roots and increase the yield. For cucumbers, eggplants, beans and other fruits and vegetables, spray the fruit and vegetables to strengthen the fruit, preserve the flowers and preserve the fruit, and strengthen the fruit. (Shi Fei)
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