Every winter and spring, due to the cold current, inadequate insulation facilities in the greenhouse, and excessive air release, the greenhouse vegetables suffer from freezing damage or cold damage, so the farmers are reminded to take precautions.
Vegetable performance after freezing
The leaves are damaged. It is a mild frost damage, and the damage in the cotyledon stage is chlorotic at the edge of the cotyledon, and there is a “white borderâ€. After the temperature returns to normal, the true leaf growth is not affected. After the planting, it will be affected by short-term low temperature or cold wind, and some leaves of the plant will be frozen. It is dark green and gradually dry.
Root damage. It is characterized by the cessation of root growth, the inability to develop new roots, and the partial roots that are yellow and gradually die. The temperature suddenly rises and the plants will wilted or grow at a slower rate. Plants with severe damage are difficult to restore growth.
The growth point is victimized. It is a serious freezing injury, often causing the top bud to be frozen, no new leaves, if the weather is warm, if it can not be restored, it must be replenished.
Flowers and fruits are affected. When the vegetables are in flowering, the cold weather will affect the pollination and fertilization effect, resulting in a large number of fallen flowers or fruit.
Precaution
1. It is necessary to do low-temperature refining at the seedling stage. During the growth of the seedlings, the temperature is strictly controlled, the temperature is not too high, and the seedlings are weak and long, and the large temperature difference seedling measures are taken to improve the stress resistance of the seedlings. In the first two days of seedling and planting, the seedbed needs to be ventilated for seedlings. Low temperature exercise.
2. Strictly master the period of colonization. In order to promote the timely planting of the vegetables after planting, the cold-warm head weather should be planted in the winter and spring seasons to facilitate the rapid growth of the seedlings and improve the stress resistance.
3. Strengthen coverage and insulation. After low temperature colonization, the small arch shed can be buckled in the shed, and the bamboo raft can be used as an arch frame. The film can be covered at night, and the grass can be covered on the film under conditions. The mulch can be covered in the greenhouse to warm and moisturize; the bottom of the shed Using a plastic film as an apron can significantly reduce the cold air intrusion at the bottom; it can also be used in the greenhouse to enhance the thermal insulation effect; in the cold season, pay attention to blocking the gaps everywhere, and minimize the heat dissipation.
4. Manual temporary heating. When the daytime temperature in the greenhouse is lower than 15 °C and the nighttime temperature is lower than 8 °C, cold damage or freezing damage may occur. Temporary heating measures shall be taken at night. The specific method is: ignite the dry straw or sawdust in the shed away from the vegetable. Waiting for smoke, or burning a honeycomb stove, can temporarily improve the greenhouse temperature, but need to pay attention to timely ventilation to eliminate harmful gases. It can also be heated by lighting in the shed, and the temporary heating equipment can be used to supplement the heat manually.
5. Management after low temperature hazard. Vegetables should actively take remedial measures after suffering various degrees of chilling or freezing damage.
One is to avoid lighting. Frozen vegetables should not be exposed to light immediately. They should be covered with straw curtains or quilts, or covered with frozen objects such as newspapers to make the frozen vegetables slowly thaw and restore growth.
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