Celery can be sown and raised in batches throughout the year, and the specific time depends on the region. For example, in Hangzhou, it is usually sown and raised in mid-June to August and late/kloc-0 to February. Among them, seedlings were raised from/kloc-0 to ~ 2 months, and the amount of seeds used per hectare was about 3500 grams. The seedlings were covered with film and the seedling age was 50 ~ 60 days. Seedlings are raised from mid-June to July, and the amount of seeds used per hectare is about 7.5 kilograms. Seedlings are raised by shading, and the seedling age is 40-50 days. In August, seedlings were raised, and the amount of seeds used per hectare was about 3500 grams. The seedlings were raised by shading, and the seedling age was about 50 days.
Because celery seeds (actually fruits) are small, the peel is firm and thick, the water permeability is poor, and the germination ability is weak, and the seed germination needs low temperature, so it is necessary to treat the seeds properly before sowing to speed up the emergence of seeds. Generally, seeds are soaked for12 ~14 hours, then washed with clear water, rubbed by hand, and the epidermis is rubbed off. After the water on the surface of seeds is dried, the seeds are germinated at the temperature of 20 ~ 22℃, and the seeds can be sown when 50% of the seeds germinate. Water the soles of the feet before sowing, and shade and rain in high temperature season. Emerge about 7 ~14 days after sowing, and keep the bed soil moist frequently after emergence, taking the principle of small water and frequent watering. Seedlings can be planted when they have 4 ~ 6 true leaves. Due to the long emergence time of celery, weeds often appear in the seedbed, so weeds should be removed by combining with thinning seedlings when the seedlings have1~ 2 true leaves.