Black plastic film covering cultivation method leek cultivation is to make the leek root in the appropriate temperature, humidity and dark conditions, relying on their own stored nutrients to grow, in the form of chlorophyll in the case, the production of fat and tender, excellent flavor, yellowish color, very little fiber, soft texture of the leek plant that is leek yellow. General leek varieties can produce leeks, but the best choice of leek-specific new varieties - pier yellow leek. Sowing time for late March ~ early June, southern warm areas can also be in late fall September ~ October sowing. The amount of seed per acre 1.5 kg ~ 2 kg, when the leek seedlings grow to 4 to 6 leaves can be transplanted. In the spring and summer, covering leeks with black plastic film can meet the soft cultivation conditions of no light, heat preservation and moisture preservation, and produce soft leeks. Now introduce its cultivation technology.
1. The cultivation of the root plant is generally used to select the two-year-old robust root plant, the open ground is only harvested 1 knife ~ 2 knife green leeks, so that the root plant more accumulation of nutrients, which is conducive to improving the yield of leeks. Before covering the green leeks are not harvested to reapply rotted human manure once, and add a small amount of urea as a base fertilizer, fertilization of the root plant;
2. The method of buckling the greenhouse and cover the management of the plastic film arched roof of the covered area is generally east-west beds of 15 m to 20 m long, 1.5 m wide is appropriate, with a No. 10 fine rebar to do brackets, each cut off 2.4 m long in the leeks beds curved into a rounded arch, the two ends are inserted into the ground about 20 centimeters, every 50 centimeters, the top of the arch is 50 centimeters from the bed, the frame with black plastic film cover tightly, and be fixed. The two ends of the beds are inserted into the sunshade, so as to let in the wind and shade. In addition, in order to regulate the temperature should also prepare straw thatch, straw thatch length and width to 2.5 meters × 1 meter is appropriate, the above preparatory work to be completed in mid-October. Cover film should be removed before the leek beds of dead leaves and weeds, leek shovel shovel not back to the green part of the ground seedlings, wound healing, watering once, 2 days ~ 3 days before covering.
3. Management after covering the black film is different from other films, it is strong light absorption, fast warming, high temperature. Therefore, covering in winter and spring, pay attention to cooling and ventilation management. Insert shades at the vents at both ends of the border at the early stage of covering to prevent sunlight from shooting into the border. In order to prevent high temperature and high humidity, to avoid leaf rot, should also be on both sides of the shed near the ground, every 3 meters buried a tile tube, to strengthen ventilation. The growth of the first crop of leeks in the winter low-temperature season, the shed temperature is low, can be covered with straw thatch on the roof of the shed, uncovered in the morning and at night to cover, improve the temperature of the shed, conducive to the growth of leeks. After the second crop of gradually rising temperatures, the shed temperature, humidity increased, should increase the density of the two sides of the tile tube, the original tile tube in the middle of an additional buried, extend the time of the two ends of the wind. When the sun is strong at noon during the day, you can cover the straw thatch to cool down, so that the shed to maintain a temperature of about 20 ℃, 60% to 70% humidity, to meet the needs of the leek robust growth. Black plastic shed cover cultivation can shorten the growth period of leeks, harvesting more often, such as timely fertilizer and watering during the harvest period, to avoid early plant de-fertilization, you can get a higher yield.