At present, most of the autumn-delayed vegetables are in the nursery season. During this time, the weather changes quickly and there is a large temperature difference between day and night. If we do not pay attention to the control of the temperature and humidity in the shed during this period, weak seedlings, stiff seedlings, etc. will easily appear. Therefore, during this period, we should pay close attention to the changes in the weather and control the temperature and humidity in the shed so as to prevent the emergence of abnormalities in the seedlings during the alternating seasons.
First, it is still necessary to cover the shade net during the day and pay attention to strengthening the ventilation. After the beginning of autumn, it is still necessary to cover the shade net on the roof at noon on sunny days to prevent seedlings from being burnt by strong light. At the same time pay attention to strengthen ventilation, control the temperature inside the shed, and prevent heat damage. The temperature of the greenhouse during the seedling period of solanaceous vegetables should be controlled at about 30°C during the day, and the temperature within the shed during the seedling period of the melon vegetables should be controlled at 32°C during the day. When the temperature in the booth exceeds 35°C, the ventilation should be increased.
Second, greenhouses should pay attention to insulation at night to avoid cold damage by seedlings. The vegetables that are in the nursery stage should pay attention to vents in the strict greenhouses in the evening to prevent the seedlings from being attacked by cold winds at night and the growth is poor. In general, the temperature of the greenhouse during the seedling period of solanaceous vegetables should be controlled at 16°C at night, and the temperature in the greenhouse during the seedling period of melons and vegetables should be controlled at 12 to 18°C ​​at night. If the temperature is lower than this standard, insulation measures should be taken in time.
Third, rainy days pay attention to strengthen management.
1, in the rainy days, the vegetables in the nursery period should be enhanced ventilation, try to avoid watering and spraying, must use the dust when the drug should be used, so as not to increase the humidity inside the shed to induce the disease.
2, to maintain adequate lighting in the shed.
3, after a long period of storm should be shaded with shade nets in time to prevent vegetables "flash seedlings."
4. Ventilation openings should be closed during rainy days to prevent rainwater from entering and causing vegetable infections and diseases.
Fourth, pay attention to the management of the seedling stage. After emergence, the seedlings were homogenized one or two times in a timely manner to remove the diseased seedlings and weak seedlings, so that the seedlings would not be crowded. Seedling stage seedlings cast manure water 2 to 3 times, or apply 1 chemical fertilizer, seedling watering should not be more to keep the soil moist. Watering in the fall should be carried out in the morning and evening when it is cool.
Fifth, to strengthen the prevention and control of plant diseases and pests. In the autumn, there are many pests and diseases in the nursery. Attention should be paid to the control of spraying. Seedling disease prevention and control: damping off disease, blight can be used wolfberry fruit (12.5% ​​diniconazole) per acre 16 grams of water spray control 30 kg; gray mold from the seedling stage prevention, optional chlorothalonil, antivirus Hemorrhoids and fast-king control. Seedling Insect Pest Control: Imidacloprid can be used to prevent aphids; underground pests can be used to kill fish by using pesticides.
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