Overwintering wolfberry vegetables in the cultivation process, often accompanied by low-temperature frost weather, so that vegetables can not normally grow due to frost damage, so we must do a good job of antifreeze insulation. The vegetable growers are advised to take the following seven measures:
First, cover warming
To maintain the tightness of the shed film, build a shed in the shed or cover the shed with an insulating material, cover the film at night, cover the grass ridge on the film, cover the mulch in the shed, and use a grasshopper and plastic film as aprons around the bottom of the shed. , can reduce the cold air at the bottom of the invasion; at the same time pay attention to block the gaps throughout, to minimize gap heat; set wind barriers, in the greenhouse north of the greenhouse vegetable stalks stacked into a wind barrier, wind and cold.
Second, temporary warming
When the indoor temperature of the shed is lower than 15°C and the nighttime temperature is lower than 5°C, cold damage or freezing injury may occur. Temporary warming measures should be taken at night to artificially supplement heat energy. Place several briquettes in the shed to increase the temperature inside the shed. However, attention should be paid to preventing carbon monoxide poisoning. Shed rooms should be ventilated and enter people later.
Third, timely removal of snow on the shed
Rain and snow weather should pay attention to the reinforcement of the shed, timely removal of the snow on the shed to prevent the collapse of the shed due to snow. Timely drainage work on both sides of the shed is done. When the rain and snow come, the shed should be closed in time to prevent rain and snow from entering the shed.
Fourth, light water pouring, under the film dark irrigation
In winter, not only the temperature is low, but also the ground temperature is low. For example, excessive watering causes the ground temperature to drop. Second, it causes poor ventilation in the soil and directly affects the activity and absorption of vegetable roots. The use of small-drip irrigation under the membrane can not only meet the needs of vegetables for water, but also does not excessively reduce the temperature of the ground and affect the ventilation conditions of the soil. Therefore, it can effectively solve the contradiction between soil water, gas and heat, and is conducive to the growth of vegetables.
Fifth, more light, clever ventilation
In case of continuous yin, rain, and snow, the management should pay attention to not cover the grasshoppers or insulation at all days so that the vegetables are in a dark environment. Do not water or spray water-based pesticides when the weather is cloudy. In dark days, due to lack of light, the dark environment of the day will cause yellowing of the vegetables. The correct course of action is to remove the grasshoppers and allow the vegetables to be exposed to scattered light to maintain the normal activity of chlorophyll, even in the event of continuous cloudy, rain, and snow weather. The vegetables are generally allowed to receive scattered light for 4-6 hours before and after noon. In case of sunny days, when the temperature in the greenhouse rises to 20°C, it can be properly ventilated and dehumidified, which is conducive to healthy growth of the seedlings.
Six, cultivator insulation cold
The ground panel knots, during the day when the hot gas enters the tillage layer is limited, the soil storage heat energy is small, and the cracks in the compacted soil are large and deep, the granule structure is poor, the former midnight is easy to lose heat, and the lower temperature in the latter part of the night is easy to cause freezing damage. The shallow cultivator can be used to break ground cracks when ventilated, so that it can not only control the transpiration of groundwater to take away thermal energy, but also keep it warm and protect seedlings.
Seven, master fertilization skills
Avoid the use of high-nitrogen fertilizers during cold spells, apply potassium fertilizers and organic fertilizers, and increase the cold-resistance of vegetables.
In winter, the temperature is low, the light is weak, and the root absorption capacity is decreased. Spraying potassium dihydrogen phosphate solution on the leaf surface can increase the sugar content and hardness of the mesophyll, increase the cold resistance of plants, and mitigate the degree of freezing injury.
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