High temperatures are very harmful to the normal growth of tomatoes. Although the tomatoes are warm, they are not heat-resistant. Experiments showed that the tomato decreased the photosynthetic intensity when it was exposed to high temperature of 30°C; when the temperature reached 35°C, the leaves suffered damage, curled leaves or yellow leaves appeared, and flowering and results were inhibited; when the temperature was over 40°C, a large number of flowers and fruit fell off. And the longer the duration, the more severe the flowers fall off. When the fruit matures, it encounters a high temperature above 30°C. The formation of lycopene is slowed down. Over 35°C, lycopene is difficult to form, and green, yellow and red fruits appear on the surface. High temperatures can also increase the occurrence of tomato disease. Such as the tomato umbilical rot, virus disease, sunburn disease, etc., can easily occur at high temperatures.
Here, remind farmers who grow tomatoes to pay attention to the ventilation of greenhouses on sunny days. If necessary, they can pull the shed membranes on both sides of the sheds (preferably, set insect nets on both sides of the shed to prevent pests outside the shed. Into), increase ventilation, it is best to control the maximum temperature at noon below 30 °C. In summer, the water supply of the plants must be guaranteed. In the case of high temperature, watering can reduce the temperature in the greenhouse and reduce the impact of high temperature on the plants. At the same time, the timely spraying of calcium fertilizer, zinc fertilizer, etc., can improve the heat resistance of plants and reduce the occurrence of diseases.
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