"Mr. Zhu, I recently had problems with the eggplant seedlings that had just been planted. The new leaves were yellow, the seedlings grew slowly, and there was a serious phenomenon of wilting. The seedlings that were bought were good seedlings, and there was no problem. What about this?"
“The bell pepper I planted has entered the flowering stage, but the phenomenon of falling flowers is very serious. What happened?â€
Recently, the reporter Zhu Zhenhua, an expert from the newspaper, often encountered farmers' friends to reflect the above problems during the process of answering the agricultural hotline. Teacher Zhu made the judgment after careful inquiry. This was due to the high temperature in the greenhouse and the high temperature barriers in vegetables.
In summer, the weather in the north is fine and the temperature rises rapidly. In some areas, the maximum outside temperature even exceeds 35°C. The temperature inside the shed is even higher. Little attention is paid. The temperature inside the shed may exceed 40°C, giving the vegetable a normal growth belt. A lot of harm came. Especially for young eggplant and pepper seedlings that have just been colonized soon, they are less tolerant to high temperature and strong light, and if they are not promptly ventilated or shade-reducing measures are taken, they can easily cause various high-temperature obstacles. When the situation is serious, large-area steamed seedlings appear. Dead seedling phenomenon.
Therefore, Zhu Zhenhua’s teacher reminded the vegetable farmers that vegetables should be “heatstroke-proof†after entering the summer to prevent the temperature in the greenhouse from exceeding the limit that the vegetables can withstand. First, reduce the temperature with the shade while enhancing ventilation. After the insect nets are installed at the front face of the greenhouse and at the outlet of the greenhouse, the air circulation is increased, and the heat in the shed is reduced. Shading can be achieved by laying shade nets, or spraying mud, ink or cooling agents on the shed film to reduce the transparency of the shed film and reduce the illumination in the shed, thereby reducing the temperature of the shed. Secondly, spray water cooling, when the temperature is high before and after noon, spraying water in the greenhouse, using the characteristics of the largest heat capacity of water to absorb heat, in order to reduce the temperature inside the greenhouse, this method is also the cooling method that our newspaper has been advocating. Finally, foliar sprays of chitin or amino acids, alginic acid and other foliar fertilizers can form a protective film on the surface of leaves to improve the resistance of the leaves.
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