Prevention of vegetable sunburn under high temperature and strong light

After entering the summer, high temperatures and strong light often cause a large number of sunburns in greenhouses, especially for eggplant vegetables. Sunburn mostly occurs in the smooth part of the fruit, and the initial disease and health junction is not obvious, and the disease part retreats green. In the middle and later stages, the diseased area is leathery and white and transparent. Therefore, management should focus on avoiding the appearance of high temperature and strong light in the shed.

Pay attention to shading, cooling, and high temperature weather, and timely set a shade net on the roof to reduce the light intensity in the shed. However, it should be noted that the shade net must not be covered all day to avoid insufficient lighting in the shed. General shade nets should be set before 10am and before 3pm.

Strengthen ventilation in the shed. When the temperature is high during the daytime, fully open the air outlet at the upper part and the front face of the greenhouse and strengthen the air release so as to lower the temperature inside the greenhouse. After the air outlet is opened, it is necessary to pay attention to tighten the pull rope for adjusting the air outlet so as to prevent people from leaving and the wind will blow off the air outlet, causing high temperature hazards.

Reasonably leaves the summer Solanum vegetables should be reasonable leaves, so that the fruit is hidden under the leaves as much as possible, avoid direct sunlight. Therefore, when Solanum vegetables are used in high temperature weather, they must be avoided at high temperatures at noon. It is better to choose after 3 pm. In addition, when the summer vegetables are planted, the spacing of the plants should be dense, so that the stems and leaves can be sheltered from one another and the fruits can be prevented from direct sunlight.

To make up for water and nutrients in the shed where the temperature is too high and the amount of soil and soil evaporation is large, we must pay attention to timely watering to ensure adequate water supply to the vegetables. At the same time, foliar fertilizer containing trace elements should be sprayed in time to promote the fruit's resistance to sunburn and reduce the incidence of sunburn.

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