Don't underestimate the cold of shed vegetables, prevent early and promote harvest

As the winter approaches, the temperature drops. If the vegetables in the greenhouse are not well managed, they are likely to suffer from freezing damage, resulting in dark green and dull leaves, abnormal flower bud differentiation, and cracked and deformed fruits in the later stage, resulting in a large decrease in yield. Seedlings damaged by low temperature in autumn and winter are susceptible to infection by pathogens, which can induce blight, damping-off, root rot, blight, leaf blight and other diseases.

Prevent early and promote healthy seedlings

First, for the cultivation of greenhouse vegetables in autumn and winter, vegetable varieties resistant to low temperature and low light should be selected. Second, cultivate robust seedlings. During seedling management, the temperature should be controlled at 13℃～25℃, especially the night temperature should not be lower than 13℃ and not higher than 20℃. Low temperature and low humidity can be used to train the seedlings within a reasonable range to promote their health. . Third, increase the application of farm manure and phosphorus and potassium fertilizers, and adopt the method of deep plowing and deep application. Phosphate fertilizers are not applied with diammonium phosphate to prevent the occurrence of umbilical rot. Superphosphate should be replaced. Fourth, for seedling planting, temporary heating measures must be prepared in advance, such as mulching film, small arches or insulation quilts, to prevent sudden changes in weather. Fifth, the use of high-ridge cultivation can increase the ground temperature. Sixth, adequate watering should be used when planting seedlings. After planting, water is generally not watered except when the seedlings are wilted due to special drought. Seventh, water properly after the fruit is set, keep the ground moist, strengthen the high temperature at noon to release moisture, and increase the resistance of the seedlings to low temperature and freezing damage.

Scientific remedy to reduce losses

In autumn and winter, when the temperature drops suddenly, the vegetables in the shed are easy to be frozen. If the freezing damage is serious, replanting is required, and the corresponding measures can be taken to remedy the milder freezing. 1. After the shed vegetables are frozen, timely and appropriate watering can increase the heat capacity of the shed soil and prevent the ground temperature from continuing to drop. After irrigation, it can also stabilize the atmospheric temperature of the ground surface, stabilize the temperature, and promote the normal growth of frozen tissues. 2. After the vegetables in the shed are frozen, do not close the shed to heat up immediately. It is necessary to scientifically let the air cool down, so that the temperature in the shed rises slowly, giving the frozen tissues sufficient time to absorb the moisture released by freezing, and promote the resurrection of the frozen tissues. Reduce deaths. 3. Spray water to heat up, spray water in the shed to increase the air humidity in the shed, stabilize the temperature in the shed, inhibit the dehydration of the frozen tissue, and promote the absorption of the frozen tissue. 4. After freezing damage, direct sunlight will cause the vegetable tissues to become dehydrated and shrink and lose vitality, so they should be protected from light in time. 5. After the freezing damage of frozen vegetables is relieved, quick-acting fertilizers should be applied in time to cut off dead tissues to make vegetables grow quickly. At the same time, it is necessary to strengthen management and timely use drugs to prevent and control pests.

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