A: After the emergence of celery, it is in the low temperature season, and the seedlings have poor drought resistance. The water should be replenished in time, and 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.
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Ventilation is one of the most important components in a successful greenhouse.
If there is no proper ventilation, greenhouses and their growing plants can become prone to problems. The main purposes of ventilation are to regulate the temperature and humidity to the optimal level, and to ensure movement of air and thus prevent build-up of plant pathogens (such as Botrytis cinerea) that prefer still air conditions. Ventilation also ensures a supply of fresh air for photosynthesis and plant respiration, and may enable important pollinators to access the greenhouse crop.
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