Leek winter cover ensures smooth overwintering key points of leek management in winter arch shed

First, prepare before covering. Leek leaves after several severe frost withered, shovel along the leek ridge with shovel leek withered leaves, and then use bamboo rake to clean. If the border soil has frozen, it can be covered with grass and other things at night. After the border soil is thawed, the leek roots are removed and dried for 5-6 days. After the bulb is frozen in the sun and night, it is beneficial to break the dormancy period, make the seedling emerge neatly and kill some leek maggots. 2-3 days before covering, the leek pier was irrigated with 50% phoxim EC 800 times or 90% crystal trichlorfon 500-600 times, then sprinkled with mature organic fertilizer mixed with soil, and then watered for several times to prepare for film mulching. Yang border winter leek is covered by heavy snow to the Winter Solstice, and small arch shed is covered by Greater Cold to the Beginning of Spring.

Ventilation of leek in winter

II. Management after coverage

1. Uncover the leek in time: the temperature of leek border should be 20-25 ℃ in daytime, no more than 30 ℃ in daytime, and no less than 6-8 ℃ at night. Uncover the grass in time according to the temperature of the border and the weather. Before the leek was unearthed, the grass leek should be uncovered late and early, uncovered after the frost melted on the leek in the morning, and covered at 3-4 p.m., in order to increase the border temperature and promote early hair. After the leek is unearthed, it is necessary to uncover the cover early and prolong the time to see the light, so as to increase the yield. in case of rain and snow, as long as the rain stops and snow stops, the snow on the grass should be swept away and the grass should be lifted; even on cloudy days, the grass should be properly uncovered so that the leek can see the light.

2. Pay attention to cleaning the film: one is to sweep away the dust and broken grass accumulated on the film to increase the transmittance, and the other is to knock down the water droplets condensed on the film in the border to increase the light and temperature. Generally vibrate 5-6 times a day, clean once, no matter sweep or hit, the force should be gentle, anti-damage film.

3. Timely ventilation: when the leek grows to 29cm high and the border temperature reaches 30 ℃, it should be properly ventilated at the back of the border or at both ends of the small arch shed. To reduce temperature and dampness, supplement carbon dioxide in the border, and prevent the occurrence and spread of Botrytis cinerea and blight.

4. Prevention and control of gray mold and blight of leek: one is to cultivate disease-free and strong seedlings, the second is to master temperature and humidity, and the third is to spray medicine at noon on sunny and windless days when sporadic leeks are found in the border. For Botrytis cinerea of leek, 50% carbendazim wettable powder or 70% mancozeb wettable powder and 50% Sukeling wettable powder 1500-2000 times can be used to spray new leaves and surrounding soil. For leek blight, spray or root irrigation with 40% ethyl phosphate aluminum wettable powder or 25% metalaxyl wettable powder and 85% methyl frost manganese zinc wettable powder The above chemicals are 40-50 kg per mu, sprayed once every 7-10 days, and sprayed 2-3 times in a row.

5. Soil cultivation: the method of soil cultivation was used to soften the white leek and improve the quality of the leek. The specific method is: as the leek grows, sift, dry and warm the fine soil at the base of the leek.

Third, harvest and management. It takes about 30-35 days to cover the leek from covering to cutting the first knife, and 25-30 days for the small arch shed. Cut leeks to choose sunny and warm weather at noon; cut as you go, uncover as much as you can, to prevent frost damage. After the first knife harvest, it is necessary to apply an appropriate amount of fine fertilizer, hold the border surface flat, cover it with film, and water it according to the moisture. After about 25 days, the second knife was cut. The second knife is cut and the third knife is cut about 30 days later. After three cuts, you can't cut any more. After three knives, the weather has turned warm, the mulch can be removed, fertilizer and water management can be strengthened to restore the growth of leek.