Cultivation techniques of celery overwintering in greenhouse to realize annual supply of celery

Overwintering celery in greenhouse is mainly planted by seedling transplanting method, which is beneficial to improve yield and quality, improve land utilization rate, reduce cost, and ensure complete and uniform seedlings. When raising seedlings and transplanting, the loose and fertile soil should be selected as the seedling pool, and the seeds should be treated before raising seedlings, so that the seeds can emerge completely and the seedlings are exuberant, which is beneficial to the growth of celery.

Celery in greenhouse

1. Growth period management: after the completion of planting, slow seedling water should be irrigated in time, once every 2-3 days, and sprayed with new high-fat film, which can effectively prevent ground water from evaporation, seedling water from transpiration, cut off diseases and insect pests, shorten slow seedling period, and make celery quickly adapt to the new environment and grow healthily. After slowing down celery seedlings, it is necessary to control watering and squat seedlings, generally squatting seedlings for about 15 days to promote root rooting, pier and heart leaf differentiation. Timely spraying of vegetable Zhuangtuanling can make celery stalks stout, leaves thick, leaves fresh and tender, luxuriant, and strong natural taste. At the same time, improve the ability to resist disasters, reduce the amount of pesticides and fertilizers, and reduce residual toxicity.

2. Fertilizer and water management: celery enters the growth period, grows faster, and needs more fertilizer and water. During this period, it is necessary to keep the soil moist and supply celery with sufficient water and nutrition. This period of watering with irrigation, combined with watering, topdressing nitrogen fertilizer. When applying urea, the urea can be dissolved by adding water in the bucket and washed into the field with the water. The combination of watering and fertilization can make the fertilization uniform and beneficial to the fertilizer effect. Real-time root irrigation with root application combined with micro-fertilizer can induce celery to absorb, digest and release nitrogen, phosphorus, potassium and various trace elements in soil, improve the positive energy of celery development and optimize the quality of celery.

3, temperature and humidity management: celery growth period, to control the temperature and humidity, winter greenhouse, the most suitable growth temperature of celery is 15-20 ℃, when the temperature is too high, celery growth stagnation, or even death; such as high humidity at the same time, celery in high temperature and humidity, prone to spot disease, leaf spot disease and other diseases. Spraying new high-fat film on the leaf surface can preserve soil moisture, prevent water evaporation, prevent sun and drought, keep heat and freeze, prevent soil layer from hardening, suffocate and isolate the source of diseases and insect pests.

4. Cold prevention and heat preservation: the weather in the north is cold, with cold currents and cold air attacking from time to time, and occasionally a sharp drop in temperature. Because the suitable growth temperature of celery is 15-20 ℃, and the temperature is lower than 15 ℃ for a long time, the growth of celery is poor, so the main heat preservation measure of celery in greenhouse is to cover grass curtain. If there is no cold current on a sunny day, the grass curtain can be put away at eight or nine o'clock in the morning, which is not only conducive to raising room temperature, but also can increase light and promote the growth of celery. And spray new high-fat film, can prevent water evaporation, prevent bacterial infection, anti-freezing and heat preservation.