In early summer, the high temperature above 33°C often occurs in the shed indoors, and premature aging occurs when the high temperature lasts for 3 to 5 days. If the nighttime temperature is relatively high, the temperature difference between day and night is too small, coupled with the low soil moisture content, the roots will grow poorly, plant growth will appear, and even the growing point will be distorted. It shows that the tomato growth point forms a 90-degree bend, the fruit enlargement is slow, Even falling flowers, fruit drop; cucumber growth point is too low, leaf hypertrophy, slow swelling of the melon, melon yards thin, melon and so on. For such a shed, increase the air volume at noon, and keep the temperature in the shed at 20°C in the afternoon, and control the temperature to 12°C to 14°C in the morning. Adjust the temperature slightly before the middle of the night. The photosynthetic accumulated nutrients in the leaves are transported to the roots, fruits and growing points during the daytime to form a temperature difference of more than 15°C.
Specific measures taken: 1 temperature management. According to the above-mentioned specific temperature management, the daytime temperature should not be too high, in the case of normal management, no more than 30 °C at noon, at night to maintain the temperature slightly higher in the middle of the night 20 °C ~ 15 °C, after midnight dropped to 15 °C below. 2 In the case of watering, ventilate during the day when the temperature reaches 32°C, but lower the temperature in the latter part of the night. In addition, by lowering the temperature of the greenhouse by watering, the gutters or ridges can be used for pouring, and the small water is used for pouring, which increases the air humidity and relatively reduces the damage of the high temperature to the crop growth. 3 Reduce the light intensity. Use shade nets or spray mud on sheds to create a normal growing environment for crops.
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