The vegetative growth period of celery is the key period to form yield. After squatting, it is necessary to concentrate fertilizer and water to promote the vegetative growth of plants. Generally, Woye high-nitrogen water-soluble fertilizer is applied 2-3 times per mu, with top dressing of 5- 10kg per mu and interval of 15-20 days. After that, we should pay attention to topdressing a high-potassium water-soluble fertilizer, because celery is a potassium-loving vegetable. Water every 5-7 days 1 time, and the amount of water should be small, so as to avoid that the low temperature in greenhouse is not conducive to petiole hypertrophy.

Spraying foliar fertilizer on leaves for 2-3 times during the growth period has a good effect of disease resistance and yield increase. 15- 20 days before harvesting, spraying 1 time on the leaves of the whole plant can accelerate the thickening and weight gain of celery, and at the same time, the tissue is crisp and tender and the quality is improved.

In addition, celery is very sensitive to boron fertilizer. Once boron is lacking, the stem will crack, so it can be prevented by spraying 0.2% boric acid or borax on the leaves. Practice shows that spraying foliar fertilizer on leaves can effectively prevent celery from boron deficiency.