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It is important to reduce the night temperature in summer vegetable greenhouses
“The temperature in the shed is too high, which leads to serious growth of vegetables and fruit drop. Do you think this can be tricked?†Many farmers told the author grief-strickenly. During this time, the weather was fine, the light was intense, and the temperature was high. The maximum temperature outside the shed was 37°C. In the shed, the temperature is much higher than outside the shed. The maximum temperature at noon often exceeds 40°C. The nighttime temperature is generally higher than 20°C, which greatly exceeds the nighttime temperature at which the vegetables normally grow. The temperature is too high, especially when the night temperature is too high, which makes the plants over-expanding. The plants are often delicate and it is difficult to flower and fruit. Reducing the greenhouse temperature is the key to good summer vegetables. This vegetable grower is very clear, but vegetable farmers have little control over the temperature in the night shed. In fact, there is no light at night, and organic nutrition is simply consumed. If the temperature is too high, the respiration will be maintained at a high level, which will lead to a large amount of organic nutrients consumed during the day, which will result in delicate plants and fruit and fruit. The main factor, therefore, vegetable farmers must pay attention to the control of night temperature. So, how to reduce the night temperature of vegetable greenhouses? If you think about it, you will know that this is contrary to the insulation of a winter greenhouse. In winter, you need to increase the heat storage capacity of the greenhouse to keep warm. In summer, you need to reduce the heat storage capacity of the greenhouse to reduce the night temperature. What does the greenhouse rely on to store heat? There is no doubt that the soil, shed walls, and pillars of the sheds. These stored a lot of heat during the daytime with strong light, and they slowly emitted at night, causing the night temperature to be too high. Therefore, to reduce the night temperature we must start from these aspects. First of all, a variety of cooling measures during the day will be used in combination to reduce the temperature inside the shed and reduce the amount of heat absorbed by the shed facilities, so as to lay a good foundation for night cooling. In the current temperature conditions, vegetable growers often open the vent to the maximum, and no longer close at night. However, when the temperature outside the shed is high, it is difficult to achieve a good cooling effect only by releasing air, and comprehensive temperature-reducing measures must be taken in time, such as setting up a screen, splashing mud, spraying a cooling agent, reasonably spraying or watering. Need to remind farmers friends is that the use of shade net time can not be too long, sunny days should not exceed 4 hours, when it is overcast on all days, so as not to affect photosynthesis. Secondly, reasonable pruning ensures a reasonable plant structure or straw coverage, reasonable watering, reducing soil light, and reducing soil heat storage. In general, when winter falls, farmers are required to remove the old leaves and diseased leaves from the lower part of the plant to increase the temperature and reduce the occurrence of diseases. In summer, when heavy rain is removed, the greenhouse is ventilated almost day and night, and the humidity inside the greenhouse is relatively small. It is recommended that growers do not want to remove the old leaves in order to block the strong light and prevent the ground temperature from rising rapidly and avoid excessive heat release at night. For sheds that have not been planted for a long time and the plants have not completely covered the ground, it is recommended that a layer of straw be added between the rows to delay the warming of the ground. In addition, reasonable watering is also an important means to reduce soil heat storage. Keeping the surface of the soil moist, when the water evaporates, it can absorb a lot of heat and prevent the ground temperature from rising too fast. Again, reduce the heat storage capacity of the shed wall. An important place for the heat storage in the sheds is the shed wall. The back wall and gable of the shed absorb a lot of heat during the day and they are released at night, causing a high night temperature in the shed. Therefore, reducing the amount of heat stored in the back wall is a good way to reduce the night temperature. Farmers can use non-woven fabrics to shelter the back wall of greenhouses. They can also grow beans, melons, and other sprawling crops to cover walls to reduce the amount of heat stored in the greenhouses. The drip irrigation facilities laid in the shed shall be covered with non-woven fabrics, etc., to prevent the exposure of strong light to accelerate the aging and affect the service life.