Celery has strong cold tolerance, especially in the seedling stage, which can withstand the short-term low temperature of -10 °C. With this feature, the seedling stage is over-winter in the shed, and after the spring, it will turn into normal growth with increasing temperature.
Seedling management
After the celery emerges, it is in the high temperature season, and the seedlings have poor drought resistance. The water should be replenished in time, and the shallow irrigation should be done to keep the soil moist. When the seedlings grow to 2~3 true leaves, the seedlings are taken and the weeds in the field are removed. When 4~5 leaves, the root system is more developed, the absorption capacity is enhanced, and the water can be properly controlled to keep the surface wet.
Fertilizer management
Celery enters the growing season, the growth is accelerated, and the required fertilizer and water are also more. In this period, the soil should be kept moist, and the celery should be supplied with sufficient water and nutrients. In this period, watering is carried out by irrigation, and nitrogen fertilizer is applied in combination with watering. When urea is applied, the urea can be dissolved in a bucket and dissolved in water, and poured into the field with water. The combination of watering and fertilization can make the fertilization uniform and facilitate the quick effect of fertilizer efficiency. In real-time root canal and micro-fertilizer combined with root irrigation, can induce the absorption, digestion and release of nitrogen, phosphorus, potassium and various trace elements in the soil, improve the positive energy of celery development, and optimize the quality of celery.
Cold insulation
In northern China, the weather is cold, with cold and cold air invading from time to time, and occasionally a large temperature drop will occur. Because the suitable growth temperature of celery is 15 ° C ~ 20 ° C, the temperature is lower than 15 ° C for a long time celery growth is poor, the main insulation measures for the cultivation of celery in greenhouses is to cover the straw curtain. If there is no cold weather on sunny days, the straw curtains can be put away at 8 or 9 in the morning, which not only helps to raise the room temperature, but also increases the light and promotes the growth of celery. And spray a new high-fat film, water-proof evaporation, anti-bacterial infection, anti-freeze insulation.
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