The occurrence of strong winds in spring is relatively frequent, especially during the March-April period, when the outside temperature is still low, once the covers of greenhouses and greenhouses are scraped off by strong winds, the vegetables in the greenhouses are vulnerable to freezing damage. To this end, it is reminded that vegetable farmers must do a good job of windproof work on greenhouse vegetables to avoid damaging the greenhouse film and freezing vegetables. To prevent wind hazards, the following measures can be taken:
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First, the film should be tightly sealed
The plastic film must be flattened when the booth is on the membrane. Both ends are fixed and firmly pressed with a lamination line. Both ends of the laminating line should be tied to the ground anchor (the end of the roof can also be anchored on the rear wall).
Second, pay attention to the weather conditions
Listen carefully to the local weather forecast. If there are strong winds, check carefully whether the plastic film has any holes, whether the film line is pressed tightly, and whether the cover is tightly closed to prevent the cover from being blown by strong winds. Plastic film It was damaged, causing the vegetables to freeze.
Third, do a good job of inspection
Normally, we must always check the tightness of the lamination line. If loose, we must re-tighten so as not to cause back and forth friction between the shed film and the lamination line due to the looseness of the lamination line. . Cover the cover tightly when covering the grass in the afternoon.
Fourth, pull grasshoppers in half
When windy weather is encountered during the daytime, if the grasshopper is pulled open, once the lamination line is not tight, or there is a hole in the shed film, the shed film can easily be damaged by strong winds. If the grass cover is used to cover the canopy, it can easily be blown away by strong winds and even be blown up by strong winds, causing damage to the shed film and freezing vegetables. Therefore, when you encounter windy weather during the day, do not pull all the grasshoppers up and pull half of the grasshoppers. At the same time, we must pay more attention to observation and respond to the problems that arise in a timely manner by taking corresponding measures.
Fifth, try not to let go
In the windy weather, try not to let go of wind during the day. If the air temperature in the shed is too high and you need to let go of the wind, you can carefully put the top wind, but the top air outlet can not be opened, and you must fix the air outlet and let it wind for 20-30 minutes.
Sixth, remedial measures
For vegetable sheds that have suffered wind disaster, one is to replace membranes, change membranes, and reinforce membranes. The severely damaged old film must be replaced with a new one. The cracks or gaps in the new film must be repaired or pasted to ensure the tightness of the film. At the same time, overhauling or breaking arches and brackets.
The second is to strengthen field management. The severely damaged plots can be considered to be destroyed and changed to other crops. For the lighter-risk vegetable fields, support the seedlings to cultivate the soil, properly raise the temperature in the shed, spray foliar fertilizers such as potassium dihydrogen phosphate, and promote the rapid growth of vegetables.