The cold resistance of celery is strong, especially the seedling stage can tolerate the short-term low temperature of -10°C. Using this feature, the seedling stage will pass through the winter in the shed, and after the spring, it will turn into normal growth with the increase of temperature.
Management of celery at seedling stage is in high temperature season after emergence, and the drought resistance of seedlings is poor. Water should be replenished in time, and shallow irrigation should be performed frequently to keep the soil moist. When the seedlings grow to 2 to 3 true leaves, they are planted and the field weeds are removed. When 4 to 5 leaves are used, the root system is more developed and the absorption capacity is enhanced. The water can be properly controlled to keep the surface wet.
Fertilizer and water management Celery enters the growth period and grows faster. It requires more fertilizer and water. In this period, we must keep the soil moist and supply celery with sufficient water 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. Real-time root application and micro-fertilizer combined with root can induce the absorption, digestion and release of nitrogen, phosphorus, potassium and various trace elements in soil, increase the positive energy of celery development, and optimize the quality of celery.
Cold insulation In cold weather in northern China, there are cold and cold air attacks from time to time, and occasionally significant cooling occurs. 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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