Celery is very cold-tolerant, especially in the seedling stage, and it can tolerate short-term low temperatures of -10°C. This feature allows the seedlings to pass through the winter in the shed. After the spring begins, it returns to normal as the temperature rises.
1, fertilizer and water management. As celery enters the growing season, it grows faster and requires more fertilizer and water. In this period, it is necessary to keep the soil moist and provide celery with sufficient moisture and nutrients. In this stage, watering is performed by means of irrigation, and nitrogen fertilizer is applied in combination with watering. When topdressing urea, urea can be added to a bucket of water to dissolve it, and it can be applied to the field with water irrigation. The combination of watering and fertilization can make the fertilization uniform and facilitate the rapid development of fertilizer efficiency.
2, cold insulation. Because celery suitable growth temperature is 15 °C ~ 20 °C, the temperature is below 15 °C long-term celery growth is poor, the use of greenhouse celery cultivation of the main insulation measures is to cover straw. If there is no cold weather on sunny days, we can retract the straw curtains at eight or nine o'clock in the morning. This will not only help increase the room temperature, but also increase the light and promote the growth of celery. And spray a new high-fat film, water evaporation points, anti-bacterial infections, freeze-thaw insulation.
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