In winter, it is the season of high temperature for the development of low-temperature obstacles in vegetables. To ensure that the vegetables maintain normal growth during the cold season and reduce the adverse effects of low temperature on vegetable production, vegetable farmers should strengthen management in all aspects to increase the day-night temperature in the greenhouse as much as possible.
First, strengthen the insulation performance of the insulation material covered
According to the local minimum winter temperature and the duration of low temperature, choose the appropriate thermal insulation cover. In the south-central part of the province, a double layer of rice straw can be covered on the outside of the shed film. In the northern part, a layer of insulation can be covered with a layer of rice straw or a layer of thick cotton quilt to reduce the amount of heat released from the roof before the greenhouse at night and ensure the night temperature. . The greenhouse where the cultivation bed is flush with the ground can also be covered with a layer of rice straw on the outside of the bottom corner of the front roof. In the deep winter season, the uncovering of heat-resistant coverings such as grasshoppers in greenhouses shall be conducted in the morning and the indoor temperature shall not be reduced. In the afternoon, when the temperature in the greenhouse drops to 20°C, it shall be covered in time to ensure that the temperature is 10°C-11 before the next day. °C.
Second, add two curtain insulation
When the lowest temperature in the shed is lower than 8°C, it can be covered in the greenhouse with a shed or two-layer multi-layer covering and heat preservation. The most commonly used is the use of hanging greenhouse wire in greenhouse fruit stents, cover a layer of plastic film, each plastic film with plastic clips fixed pressure, reducing the amount of long-wave radiation radiation at night. On sunny days, two curtains should be opened during the day to ensure the amount of light received by the plants.
Third, the use of high temperatures to increase the temperature
During the low temperature period, the temperature indexes of the air outlet and the air outlet must be different from those in other periods. Normally, the air temperature should be appropriately increased in the morning. For example, the cucumber can be increased to 32°C-33°C and then released again. The temperature in the afternoon air outlet is also increased to 22°C. The duration of high temperatures in the greenhouse increases the amount of heat stored in the greenhouse during the day and uses high temperatures to increase the temperature.
Fourth, scientific watering to avoid excessive decline in temperature
In the low-temperature season, submerged irrigation or water-saving irrigation techniques such as sub-film furrow irrigation or drip irrigation are used to reduce the amount of watering and reduce the extent of temperature drop. The ridges between small ridges are formed into small arches with steel wires or bamboo pieces to increase the space under the mulch, increase the heat storage under the mulch, and increase the ground temperature. The watering selection was conducted on a sunny morning. The high temperature at noon was used to appropriately increase the ground temperature. Watering was not conducted in the afternoon and on the cloudy day as much as possible. Otherwise, the temperature drop affected the root growth. At the same time, low temperatures coupled with high humidity can easily cause the occurrence and prevalence of vegetable diseases.
Fifth, if necessary, temporary warming to ensure the temperature
When the indoor minimum temperature is lower than 6°C, temporary heating is required. Commonly used heating measures include heating stoves and electric heating devices, and heating in the greenhouse. However, attention should be paid to safety. Take care to prevent carbon monoxide poisoning.
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