Low-temperature cold weather and snow frost weather quickly shelter
Recently, with the cooling down of strong winds, weather such as low-temperature cold waves and heavy snow frosts have gradually appeared in many places. Because of the large extent of temperature reduction and the low minimum temperature, the temperature in the facility may be greatly reduced and the temperature will increase slowly. The crop will suffer from various degrees of cold damage and frost damage. Some greenhouses may even be damaged by heavy snow. For these situations, how should we deal with and manage it?
Pre-disaster preventive measures
Pay close attention to the weather forecast in time, and take the following preventive measures in time before cooling and snow conditions occur:
1. Shelter reinforcement to prevent snow collapse. According to the forecast, before the disaster comes, check the fixing of the plastic film. The lamination line or pressure bar must be fixed firmly. For old greenhouses or skeletons with deformed skeletons, pillars should be used to reinforce them so as to prevent snow from collapsing the greenhouses; for leafy vegetables in plastic greenhouses to be harvested and removed as soon as possible, it is necessary for those who cannot remove the greenhouse films. Greenhouse skeleton reinforcement.
2. Strengthen the light transmission performance of the greenhouse. The surface of the shed film is often cleaned to increase the light transmittance; the drip-free film shed is selected to increase the light intensity in the shed and increase the temperature of the shed. Hanging aluminum film reflector can increase the temperature of ground. Add two curtains and a small shed; the ground covered with straw and straw.
3. Reduce the management temperature, implement low-temperature refining seedlings, improve the ability of vegetables to resist cold. To control the temperature in the shed, avoid overheating in the shed during sunny days, especially when the temperature in the shed is too high, release the air slowly, and avoid sudden fluctuation of the shed temperature.
4. At the time when the cold and rainy weather comes, the plants with weaker growth or more results will be harvested in time, and appropriate fruit thinning and thinning will occur.
5. Prepare heat-preserving articles such as grasshoppers, quilts, stoves, temperature-increasing blocks, mobile stoves, or fill lights in advance.
Post-disaster remedial measures
1. In case of strong winds, it is necessary to laminate the shelter and cover the grasshoppers.
The snow should be cleaned in time, snowfall should be taken while the snow is snowing, and clearing should be carried out. In particular, it is necessary to strengthen snow removal at night to avoid excessive thick snow and facilities collapse. This will result in losses; good management of external insulation coverings must be done during the day. Grasshoppers are used to increase scattered light in the sheds and cover them with plastic sheets to prevent rain and snow from soaking the outer insulation coverings. After covering the insulation at the night/grass, a layer of rain/snow film is added.
2. Prevention and control booths have excessive humidity.
Minimize watering or not watering; open the grasshopper after the morning, open the air outlet and reduce the humidity in the greenhouse, but adjust the air release time according to the outside temperature; fill the cover at the damaged place on the surface of the film; do not use the foliar spray to prevent and control the pests. Use aerosol or dust as much as possible. Conditionally install electric demisting equipment to reduce the humidity in the booth.
3. When the temperature in the greenhouse falls to the minimum temperature required by the vegetables, warming measures are taken.
Check the tightness of the insulation or grasshoppers for close contact; take warming measures to increase the temperature and reduce the relative humidity of the greenhouse. Temporary increase of fire, electric heating equipment, etc., for the automatic heating fan, can start 1-1.5 hours at 10 o'clock in the evening and 2 o'clock in the morning; also can use the "greenhouse hot treasure" emergency temperature increase block, 10 per mu of land, Light up the app around 1 o'clock in the morning.
4. Improve lighting in the shed to ensure normal plant growth.
In order to increase the transmittance of scattered light, wipe the shed film with a long mop cloth to keep the shed film clean every day or at intervals of 2-3 days; try to install fill light fixtures: install light fixtures for each production site, such as Yuba, Plant growth lights.
5. Make plant adjustments to reduce plant growth burden.
Due to the recent lack of light, the plants are inhibited and the growth potential is weak. The main manifestations are the yellowing and thinning of leaves. To reduce the burden of plant growth, timely removal of old leaves and removal of malformed fruit is necessary for the upcoming harvesting standards. The fruit must be harvested early.
6. Spray antifreeze agents to improve the cold resistance of vegetables and suffer freezing injury. Remedy in time. Cut off dead branches and spray manually.
7. After-sun management
After the weather is clear, the management is mainly based on low temperature, less light, gradually increasing the light and temperature; the effect of sudden weather on the plants is prevented by grasshoppers or heat preservation by half a roll, and it is found that the plants are wilted and the heat insulation is removed in time.苫 苫 并且 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫 苫;
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