How to grow tomato over-summer seedlings

There are four fears of tomato seedlings in summer: one is afraid of exposure to the sun, two is afraid of rain, three is afraid of high temperature, and four is afraid of excessive growth. In order to cultivate strong seedlings, the following measures must be taken:
Choose a dry and ventilated vegetable garden as a seedbed and set up an awning. The seedbed is about 1 meter wide. The bed awning must have a layer of plastic film to prevent rainwater from entering. The flower blinds on the film can transmit light and shade. When it rains, cover the awning with a film to prevent the seedlings from being exposed to hot rain. Use curtains to shade the seedlings at noon on sunny and hot days to prevent the seedlings from being exposed to the hot sun.
The seedling age should be short, usually 30 to 35 days, and seedlings should be grown once without dividing the seedlings to prevent infection of the roots from the transplanted seedlings.
The delayed autumn tomatoes in the greenhouse are cultivated during the hot and rainy season in summer, and the most serious diseases are more serious. You can spray 500 times chlorothalonil or antitoxin alum for control during the nursery period.
In the later stage, control watering and prevent rainwater from irrigating, causing the seedlings to grow excessively.
To prevent the seedlings from growing excessively, spray the leaves with chlormequat 0.1% to 0.15% for a total of 2 sprays to make the seedlings strong and strong.

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