Celery is an annual or perennial herb, rich in vitamins, minerals, flavonoids and volatile oil compounds, is one of the important edible and medicinal vegetables.

In facility cultivation, the development of celery industry is restricted by diseases, lack of nutrients and high residue. Soilless cultivation can provide a good growing environment for crops, reduce the occurrence of pests and diseases, and has the advantages of saving labor, fertilizer and water, so it has become an important mode of vegetable cultivation development. Nutrient solution is an important environment for the survival of hydroponic vegetables. Different nutrient solution formulations and concentrations have important effects on the growth, quality and yield of vegetables.

Calcium is an essential nutrient for plant growth, calcium deficiency or calcium concentration is too high will affect the normal growth of plants, celery calcium deficiency will lead to black heart disease.

Treatment with 1.0mmol·L-1 calcium concentration was beneficial to increase the yield of celery in hydroponic culture, and treatment with 1.5mmol·L-1 calcium concentration was beneficial to improve the quality of celery in hydroponic culture.