Indeed, when the temperature rises, greenhouse vegetables have ushered in a period of rapid growth and high yields. However, in an interview with the countryside, the reporters found that the temperature of the greenhouse is too high, especially the high night temperature is the key reason for the above problems.
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After many sheds open the shed in the morning, the temperatures in the shed are mostly between 17-19°C. According to the law of temperature change in sheds, the temperature at the upper part of the penthouse should reach 20°C or more. In this way, the respiration is vigorous, organic nutrients are consumed, and more energy is released, leading to excessive growth of nutrient overgrown plants; at the same time, due to large consumption of organic nutrients, flower buds and fruits do not receive adequate nutrition for their growth, and thus behave as "Falling and falling fruit" or "increased number of malformed fruits" occurs, and that is what farmers often say, "Wang has no fruit."
It is understood that in the control of daytime temperature, vegetable farmers can control the temperature according to the temperature demand of vegetable growth. Such as pepper, eggplant, etc. are generally controlled at 28-30 °C during the day, the maximum does not exceed 33 °C.
By controlling the temperature during the day, not only the problem of poor flower bud differentiation caused by high temperature is avoided, but also the photosynthetic rate is increased, and the leaves are manufactured and accumulated a large amount of organic nutrients. However, the negligence of nighttime temperature control makes the night temperature too high, wasting a lot of organic nutrients, and thus the plant growth and flowering results are poor.
Therefore, the current greenhouse vegetable management should be good night temperature control, lower night temperature. The different needs of night temperature can be controlled according to different vegetables. Such as pepper should be controlled at 15-17 °C; eggplant should be controlled at 15-20 °C; cucumber should be controlled at 13-15 °C and so on.
Measures to reduce the night temperature include:
1, late off wind, late shed. Should be changed 20 °C off the wind, 18 °C put the shelf is about 17 °C off the wind, 15 °C or so shed. When the minimum temperature in the shed is kept at about 15°C, it is no longer necessary to keep the shed warm.
2. Remove the floating membrane on the grasshopper. When the temperature is too high at night, pull the air outlet to cool it.
3. It is also possible to change the coverage of grasshoppers to 1/2-2/3 coverage. If the shutter is used, it can only be placed in the 1/2-2/3 position of the shed. Wang Guangshui has a high night temperature and the vegetables have a strong respiration. They are prone to cause physiological diseases in vegetables and are not conducive to flowering. 