The temperature in the shed is too high, causing the vegetables to grow long and fall and fall. The weather is fine in summer , the light is strong, the temperature is very high, and the maximum temperature outside the shed reaches 37 °C. In the shed, the temperature is much higher than the outside of the shed, and 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 vegetables grow normally. The temperature is too high, especially the night temperature is too high, so that the respiration of the plant is too strong, the plants are often relatively thin, and it is difficult to flower. To reduce the night temperature, we must start from these aspects.
First of all, a variety of cooling measures during the day to reduce the temperature inside the shed, reduce the heat absorption of the shed facilities, and lay a good foundation for night cooling. At current temperature conditions, vegetable growers tend to open the vents to the maximum and no longer close at night. However, when the temperature outside the shed is also high, it is difficult to achieve a better cooling effect only by releasing the wind. It is necessary to take comprehensive cooling measures in time, such as setting a sunshade net, splashing mud, spraying a cooling agent, reasonably spraying water or watering. Need to remind the vegetable farmers that the use of shade nets should not be too long, sunny days should not exceed 4 hours, all should be put away on cloudy days, so as not to affect photosynthesis.
Secondly, reasonable pruning ensures a reasonable plant-shaped structure or covering the straw, rationally watering, reducing soil visibility and reducing soil heat storage. Generally speaking, when the vines are falling in winter, the vegetable farmers are required to remove the old leaves and diseased leaves in the lower part to increase the ground temperature and reduce the occurrence of diseases. In summer, the rain is removed, the greenhouse is ventilated almost day and night, and the humidity in the shed is small. It is recommended that the vegetable farmers should not remove the old leaves to shield the strong light from the rapid rise of the ground temperature and avoid excessive heat dissipation at night. For greenhouses where the planting time is not long and the plants have not completely covered the ground, it is recommended to cover a layer of straw between rows to delay the warming of the ground. In addition, reasonable watering is also an important means to reduce soil heat storage. Keep the surface of the soil moist, and absorb a lot of heat when the water evaporates to prevent the ground temperature from rising too fast.
Again, reduce the heat stored in the shed wall. An important place for heat storage in the shed is the shed wall. The back wall of the shed and the gable absorb a lot of heat during the day and are released at night, resulting in high night temperatures in the shed. Therefore, reducing the heat storage of the back wall is a good way to reduce the night temperature. The vegetable growers can block the back wall of the greenhouse with non-woven fabrics, etc., or grow peas, melons and other vine crops covering the wall at the shed wall to reduce the heat stored in the shed wall. The drip irrigation facilities laid in the shed should be covered with non-woven fabrics to prevent the aging of the main light and affect the service life.
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