Cultivation techniques of leeks in greenhouse

(1) Variety selection. Choose high-quality and high-yield varieties with strong adaptability and strong tillering ability, wide and thick leaves, short dormancy period, and early germination. Such as Hanzhong Dongyu, Pingyi No. 2, Henan 791 and so on.

(2) Seeding and seedling raising. Live or nurse seedlings before and after the Qingming. The live broadcast adopts striping, the spacing is 33-35 cm, the seeding ditch is 2 cm deep, the broadcasting width is 5 cm, and the seeding amount is 3.0--3.5 kg; the seedling transplanting is carried out by sowing, and the seeding is 0.15-1.0 kg per 0.1 mu seedbed, which can be planted. 1.0 mu of Daejeon. Soak the seeds and germination before sowing. The method is to soak the full new seeds with 30 degrees warm water for 12 hours, then rinse them out with water for 2-3 times, then wrap them in a clean damp cloth and germination at 25 °C, 2-3 After the day, when 30% of the seeds are white, they can be sown. The planting water is poured before the sowing. After the sowing, the fine soil is covered with 1.0 cm thick, and the mulch film is covered. When more than 10% of the seedlings are out of the ground, the mulch is removed in time.

(3) Management of seedling stage: 1. Weeding. Amaranth seedlings grow slowly and are susceptible to weeds. They must be weeded in time. They can be artificially weeded or used. After sowing, 33% of the herbicide is used to spray 100% of the emulsifiable concentrate and 50kg of water to spray the surface. The effective period is 40-50. day. When the weeds have expired and the weeds occur in large numbers, the grass should be manually removed first, 3-4 leaf stage, weeds with 20% per acre to catch 65-100 grams of emulsifiable concentrate, 50 kg of water, for weed stems and leaves spray. 2. Fertilizer management. Before the three-leaf stage, combined with watering and topdressing 2-3 times, each time the acres of chasing rot people bake 500kg or urea 5-10kg, after the third period, appropriate seedlings, reducing the number of watering. In the rainy season, the "three ditch" should be cleared, and the accumulated water should be removed in time to prevent the roots from smashing.

(4) Colonization. Spring sowing seedling age 70-80 days, when the seedling height is 1820 cm, there are 5-6 leaves to colonize. Before planting, apply 5000kg of organic fertilizer and 50kg of compound fertilizer per acre. Deep ploughing of fine fertilizer, hoeing for the ground, 2 meters wide, 50 cm wide and 30 meters long (4.5 meters wide, 30 meters long, two sheds). Planting density, line spacing, 30X25 cm, 20-25 per hole.

(5) Strengthening field management. After planting, the root water is poured, and the water is poured once every 4-5 days at the initial stage to promote the gradual cultivation of the seedlings for 2-3 times after each watering, and the drainage is strengthened during the rainy season. After the fall, it is necessary to strengthen the management of fertilizer and water. Generally, water is poured once every 5-7 days, and once every half month, it is 2-3 times. Each time the acre is 15kg of urea or 1500kg of manure and manure, stop the topdressing and watering in late September.

(6) Knowing the time and shacking. In the middle and late November, the outer leaves of the leek were fully withered and the shed was covered. Cut the leek before the shed, clean the noodles, water and fertilize. After drying for 3-4 days, choose a windless sunny day to buckle the shed.

(7) Management after the shed. 1. Temperature. The suitable temperature for the growth of leek is 18-20 degrees. The temperature in the shed is kept at 20 degrees during the day and 5 degrees at night. The temperature in the early stage of the shed is high, and it can be ventilated and cooled around noon. 4-5 days before harvesting, the head is smashed and released, and the air is not ventilated after harvesting. When the new leaves grow to 9-12 cm high, the wind will be released when the shed temperature exceeds 25 degrees. After each watering, it should be properly ventilated and cooled. . 2. Fertilizer management. Before cutting the knives, do not water the water. When the two knives are 6 cm long, combine watering, 20-30 kg of compound fertilizer per acre or 1500 kg of human and animal waste, and then water for 4-5 days before harvesting. The temperature of the shed depends on the temperature. In the future, every time you cut a knife, you must lick the ridges and dry the bulbs. After the new leaves grow, combine the watering and topdressing and cultivate the soil.

(8) Harvesting. After the planting, the leeks are not harvested from the shed, and about 40 days after the shed, the first knives are harvested about 25 cm in height, and the knives are harvested by 3-4 knives per mu. Up to 3000kg.

(9) Management after the shed. In the following year, from the end of March to the beginning of April, the shed will be demolished. After the shed, organic fertilizer will be applied to roots. Generally, it will not be harvested, and the growing field can harvest 1-2 knives. During the rainy season, pay attention to drainage, and pick up a season of moss in the late summer. Strengthen the management of fertilizer and water after the autumn, and lay a good foundation for the next greenhouse cultivation.

(10) Pest control. The pests and diseases of leeks in greenhouse are mainly cockroaches and gray mold. The cockroaches can be irrigated with 50% phoxim 800 times solution or 90% crystal trichlorfon 1000 times solution; 50% keering WP can be used in the early stage of gray mold. 1000 times liquid, spray once every 7 days, even spray 2-3 times, better control effect

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