First, the variety selection 1, wintering, spring lettuce Variety of cold resistance, strong adaptability, and late convulsions. 2, summer, autumn lettuce Heat-resistant, precocious variety. Second, the sowing date is determined 1, spring lettuce Greenhouse seedling time: December to March; open field seedling planting time: February to March. 2, summer lettuce Open cultivation time: April to May; sunshade coverage time: May to July; live or high density transplantation. 3. Autumn lettuce Shading net shade coverage time: July-September; seedling transplanting. 4, winter lettuce Open field nursery time: October to November. Third, cultivate strong seedlings l, soil preparation a. Seedbed requirements: land with high topography and dryness and good drainage performance. b. Treatment before sowing: Apply 5-10kg of Yifuyuan planting liquid + 1.5-3 tons of decomposed organic fertilizer or 50kg of compound fertilizer as base fertilizer per acre. c. Pre-land preparation: Before the soil preparation, it should be deep-turned after being applied, and then flattened and covered with plastic film for seeding. 2, seed treatment Due to the high temperature in May-September, the seed germination is difficult. Therefore, it is necessary to carry out low-temperature germination before sowing. The seeds are placed in the nutrient water diluted 200-300 times of the beneficial source microbial nutrient solution for 6-7 hours, and then wet gauze is used. The environment monkey with a temperature of minus 3 or minus 5 degrees is frozen for 24 hours, then placed in a cool place, and it can be germinated in two or three days. 3, sowing 3.1 Spring lettuce a. Spring lettuce in the greenhouse seedling sowing, first uncover the plastic film on the nursery, after pouring the bottom water, spray 3-5kg of Yifuyuan microbial nutrient solution per mu, then mix the seeds in a small amount of fine soil. Soak evenly. Generally, the seeding rate of the seedbed of 10m2 is 25-30g. After sowing, it covers 0.3-0.5cm of fine soil and covers the film. In the evening, it is covered with a shading net. If it is open field, it is covered with a small shed. b. Before the lettuce seedlings are unearthed, cover the cover early in the evening, without ventilation, increase the temperature of the seedbed. After the seedlings are unearthed, the sunshade net will be exposed early and properly ventilated to keep the daytime temperature within the range of 12-20 degrees. The temperature is in the range of 5-8 degrees. When the seedlings grow to 2-3 straight leaves, the seedlings are once, the seedling distance is 5cm, and the ventilation and refining are increased 5-6 days before transplanting. 3.2 Summer lettuce a. The best weather for summer lettuce planting is cloudy. When the rice is in the middle of April-May, the wet seed cover film is broadcasted. After the lettuce is released, the film is removed. In May-October, the shade net is covered with a small arch shed or a flat shed. Lettuce emerged, or grow in lettuce for 2 pieces of true leaf time, once in the case of 4-5 true leaves, the seedling distance is 10cm, for the robust growth of lettuce seedlings, the planting distance can be 10cm. Density planting. b. After each completion of the seedling, room seedling and transplanting seedlings, it is necessary to apply the decomposed and dilute manure water in combination with watering, and in the rainy weather, the ditch should be cleaned. 15 times before planting, 3-5kg of Yifuyuan microbial nutrient solution water is poured per acre. After the seedlings are transplanted or within 25 days after transplanting, the lettuce plants can be harvested. 3.3 Qiuwo Bamboo Shoots a. Before planting the autumn lettuce, the seedbed is firstly wetted with the diluted water of the beneficial source microbial nutrient solution. After sowing, a layer of 3-4% of the decomposed pig manure is covered and covered with thin straw (covering the black shade net) Yes), sowing seeds or wet seeds. The double-layer floating surface is covered on the seedbed soil before emergence, and the silver-gray shade net is covered after the emergence of the seedling. b. Watering fertilizer should be needed in the morning and evening to keep the seedbed in a humid state, and weeding seedlings are also needed. Fourth, planting and management 1, colonization When lettuce is planted, it is necessary to select soil with good drainage performance, and apply 4000-5000 kg of decomposed organic fertilizer per mu. In the ploughing of the land, a 1.2-1.5m wide sorghum is made. The lettuce seedling is to pour the diluted water of the beneficial source microbial nutrient solution into the seedbed. 2, spring lettuce Let the lettuce age 25-30 days, plant the leaves when the leaves are 5, and water the plants after planting. For the cultivation of the plastic film, apply a base fertilizer and cover the film. In the rainy season, drain and stain should be done. For greenhouse cultivation and open field cultivation, it should be ploughed once or twice in fine weather, watered and fertilized at the right time to keep the surface moist. 3. Autumn lettuce When the lettuce age is 25, choose cloudy or afternoon planting, and the planting distance of the planting plant is 2535cm. Watering should be timely after planting, and the shading net should be covered with small arch shed or flat shed. Before and after the closure period of the lettuce plants, 3000-4000 kg of decomposed human and animal manure is applied per mu, or 15 kg of urea is applied two or three times. 4, winter lettuce Overwintering lettuce seedlings are covered with plastic film during the day and the planting distance is 3040cm. After planting, the application of Yifuyuan microbial nutrient solution dilution water, should pay attention to the refining before wintering, should not be too much fertilizer, prevent the growth of lettuce seedlings Wang, in the second year to remove weeds in a timely manner, shallow cultivating once, using the mulch and greenhouse cultivation, you must apply the base fertilizer, pay attention to ventilation management. V. Harvesting 1. Tender plant harvesting: The stem can be harvested at any time before it is fully hypertrophied. 2. Harvesting of lettuce stems: The highest leaves of lettuce are harvested at the same level. 3, autumn lettuce: you can delay the harvest, on the sunny day to hand over long points and flower buds, or the beginning of the rosette period, spray 350-500 dwarfs two or three times every 5-7 days. Disclaimer: Some articles on this website are transferred from the Internet. 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