1. Variety selection

1. Overwintering and spring lettuce

Varieties that are resistant to cold, have strong adaptability, and are late in bolting.

2. Summer and autumn lettuce

Heat-resistant, early-maturing varieties.

Second, the sowing date is determined

1. Spring lettuce

Greenhouse seedling raising time: December to March; open field seedling raising and sowing time: February to March.

2. Summer lettuce

Open field cultivation time: April to May; shading net cover time: May to July; live broadcast or high-density transplantation is used.

3. Autumn lettuce

Shade nets cover time: July to September; use seedlings for transplanting.

4. Winter lettuce

Open field nursery time: October to November.

Three, cultivate strong seedlings

l. Site preparation

a. Seedbed requirements: high, dry land with good drainage performance.

b. Pre-planting treatment: Apply 5-10kg of Yifuyuan planting bacteria liquid + 1.5-3 tons of decomposed organic fertilizer or 50kg of compound fertilizer as base fertilizer per acre of land.

c. Pre-treatment of soil preparation: Before soil preparation, apply it first and then deep turn it. After leveling and thinning, cover with plastic film for seeding.

2. Seed treatment

Due to the relatively high temperature in May-September, it is difficult for seeds to germinate. Therefore, it is necessary to carry out low-temperature sprouting before sowing. Place the seeds in nutrient water diluted 200-300 times by Yifuyuan's microbial nutrient solution and soak for 6-7 hours, and then use wet gauze. Wrap the monkey in an environment of minus 3 or minus 5 degrees and freeze it for 24 hours, then put it in a cool place and wait for two or three days to germinate.

3. Sowing

3.1 Spring lettuce

a. When spring lettuce is cultivated and planted in a greenhouse, the plastic film on the seedling border is first uncovered, after pouring foot water, spray 3-5kg of Yifuyuan microbial nutrient solution per acre, and then mix the seeds in a small amount of fine soil and stir. Seed evenly. Generally speaking, the seeding rate of 10 square meters seedbed is 25-30g. After sowing, it is covered with 0.3-0.5cm of fine soil and covered with film. In the evening, it is necessary to cover with shading nets. If it is to raise seedlings in the open field, cover a small shed.

b. Before the lettuce seedlings are unearthed, uncover the early cover at night, without ventilation, increase the bed temperature. After the seedlings are unearthed, uncover the shading net in the morning and cover at night, and properly ventilate to keep the temperature in the range of 12-20 degrees during the day and at night. The temperature is in the range of 5-8 degrees. When the seedlings grow to 2-3 straight leaves, thin the seedlings once at a distance of 5cm. Increase the ventilation and temper the seedlings 5-6 days before transplanting.

3.2 Summer lettuce

a. The best weather for planting summer lettuce is cloudy. Sowing the wet seeds and covering the film in April-May, and when the lettuce emerges, remove the film. In May-October, use a small arched shed or flat shed to cover the sunshade net. Lettuce seedlings emerge, or seedlings once when the lettuce grows to 2 true leaves, and once when the lettuce grows to 4-5 true leaves, the seedling distance is 10cm. For the robust growth of lettuce seedlings, the height can be adjusted according to the plant row distance of 10cm. Density planting.

b. After each completion of thinning, room seedling and transplanting slow seedling, it is necessary to combine watering to apply decomposed and dilute manure water, and to clear the ditch and drain the stains in rainy weather. 15 days before planting, water 3-5kg of Yifuyuan microbial nutrient solution per mu of land once 15 days before planting, and within 25 days after planting or transplanting, tender lettuce plants can be harvested and put on the market.

3.3 Autumn nest bamboo shoots

a. Before planting autumn lettuce, first water the seedbed with Yifuyuan microbial nutrient solution diluted with water. After planting, cover a layer of decomposed pig manure with a concentration of 3-4% and cover with thin straw (covered with black shading net) Yes), sowing sprouted seeds or wet seeds. Before emergence, the double-layer floating surface is covered on the seedbed soil, and after emergence, it is covered with silver-gray shade net.

b. Both morning and evening, watering and fertilizer are required to keep the seedbed in a moist state, and at the same time, weeding and thinning are required.

Four, colonization and management

1. Colonization

When lettuce is planted, it is necessary to choose soil with good drainage performance, and apply 4000-5000kg decomposed organic fertilizer per acre of land. In plowing and preparing the land, a 1.2-1.5m wide high border is made. Lettuce seedling starts by pouring the diluted water of Yifuyuan microbial nutrient solution on the seedbed.

2. Spring lettuce

Let the lettuce grow 25-30 days old, plant it when it has 5 leaves, water it after planting, and apply base fertilizer once and cover it with a good film for mulching cultivation. Drain and prevent stains in the rainy season. For greenhouse and open field cultivation, plough once or twice in sunny weather, water and fertilize at the right time, and keep the border surface moist.

3. Autumn lettuce

Lettuce seedlings are planted on a cloudy day or in the afternoon when they are 25, and the planting distance is 25×35cm. After planting, water them in time, and cover the shading net with a small arch shed or flat shed. Before and after the stem sealing period of lettuce plants, 3,000-4,000 kg of decomposed human and livestock manure is applied per mu of land, or 15 kg of urea is applied two or three times.

4. Overwintering lettuce

Overwintering lettuce seedlings are planted with plastic mulch cover around the daytime, and the distance between planting plants is 30×40cm. After planting, add Fuyuan microbial nutrient solution diluted water after planting. Care should be taken to refine the seedlings before overwintering, and excessive fertilizer and water should not be used to prevent lettuce seedlings from appearing. If the growth is too prosperous, weeds should be removed in time in the second year, shallow field tillage once, and planted with plastic film and greenhouses, plantar fertilizer should be applied and ventilation management should be paid attention to.

Five, harvest

1. Tender plant harvesting: The stem can be harvested at any time before the stem is fully enlarged.

2. Lettuce stalk harvest: the highest leaf on the top of lettuce is harvested at ordinary times.

3. Autumn lettuce: The harvest can be delayed. On a sunny day, pinch the long spots and flower buds by hand, or start the rosette period, spray 350-500 dwarf element two or three times every 5-7 days.

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