How to manage leek in winter greenhouse?

First, the management of the leek border in front of the shed. In the middle of November, the withered leaves and weeds in the leek border were cut and cleaned up and ploughed between the rows, ditched and fertilized, generally applying 2000kg / mu of rotten organic fertilizer or 20kg / mu of compound fertilizer. After application, the covered soil was flat with the leek pier and watered. After the cover soil sinks, cover the fine soil and bury the leek pier once again.

Second, cultivate the soil properly. Leek can emerge about 25 days after buckle shed, wait until the seedling grows to 6-7 cm high, the soil height is 3-4 cm; when the seedling grows to 10-15 cm high, the second cultivation is carried out, the height of the soil is 6-7 cm, the leek root becomes a mound, and the row becomes a trench.

Third, temperature management. The suitable temperature for the growth of leek is 18 ℃ ~ 20 ℃, about 20 ℃ in the daytime and more than 6 ℃ at night. The air temperature is high at the beginning of the shed, so it can be ventilated and cooled around noon. 4-5 days before harvest, properly uncover the film and let out the air, and there will be no ventilation after harvest. When the new leaves grow to 9cm high and the greenhouse temperature exceeds 25 ℃, it can be properly ventilated and cooled after each watering.

Fourth, fertilizer and water management. Before cutting chives, do not water, when the second knife leeks grow to 6 cm high, combined with watering, apply 20 kilograms of compound fertilizer or 1500 kilograms of human and animal manure per mu, and then water 4-5 days before harvest, the amount of water is determined by the greenhouse temperature. After each cut, the ridges should be ripped, the bulbs should be dried, and after the new leaves grow, they should be watered, fertilized and cultivated.

Fifth, harvest at the right time. When the leek is 20-25 cm high, the first knife is cut, and then each knife is 20-25 days apart. Generally, 3-4 knives are harvested in the shed, and the yield per mu can reach 3000 kg. Attention when harvesting: the earliest harvest period should be after 5 leaves, and the knife should not be too deep, just stick to the soil, otherwise the bulb will be injured and the seedlings will be broken.

Sixth, pest prevention and control. The main diseases and insect pests of leek in greenhouse are leek maggot and Botrytis cinerea. Leek maggot can be irrigated with 1000 times liquid of 90% crystal trichlorfon; 1000 times liquid of 50% Sukeling wettable powder is selected at the initial stage of Botrytis cinerea, spraying once every 7 days, continuously spraying 2 times 3 times, the control effect is better.