The high-efficiency planting mode of lettuce-cabbage-garlic seedlings in greenhouses is to use the common plastic greenhouse to cultivate lettuce, to supply the spring off-season market, to replant the cabbage after harvest, to mention the morning market, and to replant the garlic seedlings. This cultivation mode has become an important way for farmers to increase their income. The yield of lettuce in greenhouse is more than 52,500 kg/hm2, the output value is 73,500 yuan/hm2, the output of cabbage is 45,000 kg/hm2, the output value is 22,500 yuan/hm2, the output of garlic seedling is 67,500 kg/hm2, the output value is 67,500 yuan/hm2, and the total output value is 16.35 million yuan / hm2, net income of about 12,750 / hm2.  
èŒ¬å£ arrangement
Lettuce is planted in the greenhouse in the middle and late December, transplanted from late January to early February of the following year, harvested in late April; cabbage is seeded in late March, transplanted in early May, harvested in July; garlic seedlings are planted in late July. It can be harvested before winter, or it can be shed for insulation to supply the Spring Festival market by the end of the year.  
Main points of cultivation of lettuce in greenhouse
Variety
Choose varieties that are cold-tolerant, adaptable, and late in twitching, such as cold-resistant white leaves, cold-resistant two white skin and other varieties.
Nursery
Seedlings in the middle and late December. Soak the seeds in clean water for about 24 hours before sowing, then wash the moisturizing and germination. When the seed germination is about 80%, the seed can be mixed in a small amount of fine soil and mixed well. After sowing, the seedling bed is poured with the bottom water. After the underwater seepage, the soil is covered with 0.5~1 cm and covered with a film. Control the watering during the seedling period to prevent the seedlings from growing.
Colonization and management
Before planting, 75,000 kg of fermented organic fertilizer per hectare and 1500 kg of compound fertilizer were used as base fertilizer. The planting ridge width is 120cm, the height is 15cm, the furrow width is 30cm, and the greenhouse film is buckled. When the seedling age is about 40d, the planting is carried out, and the row spacing is 35cm×30cm. After planting, the seedling water is poured. At the initial stage of planting, pay attention to ventilation and dehumidification. When the stem begins to expand until the harvest, the temperature of the shed is controlled at 15-20 °C. When the stem is larger than 20 °C, the shed film can be removed and watered and topdressed to keep the soil moist.
Pest Control
The diseases of lettuce in greenhouse are mainly downy mildew, gray mold and sclerotinia. In the early stage of the disease, 25% of metalaxyl Mn-Zn wettable powder is used in 800-900 times liquid, 50% quick-drying WP 1500 times or 50% carbendazim suspension 500-600 times liquid spray 2 to 3 times. Control 1 time every 7 days.
reward
The optimum period for harvesting lettuce is when the top of the main stem is level with the tip of the highest leaf. In order to raise the morning market, it is possible to pick up early, collect large and stay small, and go public in batches to increase production.
Key points of cultivation techniques of cabbage
Variety selection of medium-ripe varieties, such as Jingfeng No. 1, Zhonggan 8, Xiaguang and so on.
Nursery
Seedlings in late March. Before sowing, the seeds were treated with 55% warm water for 15 minutes, then soaked for about 3 hours under normal temperature conditions, and the dried stalks were placed under the condition of 22-24 °C to germination, and about 80% of the seeds were germinated to be sown. The nursery bed is poured through the bottom water, and the seed is sprinkled after the underwater seepage. After sowing, cover the soil evenly about 1cm. In order to prevent the occurrence of blight, the soil can be sterilized by 50% carbendazim WP, and 7~10g per square meter is mixed in the soil.
Seedling management
The temperature during the day before emergence is 20 to 25 ° C, and the temperature at night is 13 to 15 ° C. After the seedlings are unearthed, they will start to release the wind properly, and cool down the seedlings. 12 to 15 ° C during the day, 5 to 8 ° C during the night, and then gradually increase the temperature, 15 to 20 ° C during the day. 8 to 10 ° C at night. When the seedlings grow to 2 leaves and 1 heart, they are transplanted.
Site preparation and planting of fixed soils 60,000 kg of fermented organic fertilizer per hectare, 750 kg of superphosphate. Planting was carried out in early May, and the seedlings were subjected to low temperature exercise 5 to 7 days before planting to adapt them to external conditions. After planting, the seedling water is poured, the seedlings are ventilated in time, the temperature is lowered, and the length is prevented. Planting row spacing is 40cm × 40cm.
Fertilizer management in the rosette period 1 time of topdressing, urea application 225kg / hm2. Timely cultivating and weeding, proper control of irrigation at the end of the rosette to prevent water accumulation in the field.
Pest Control
Soft rot can be irrigated with a solution of agricultural streptomycin at a concentration of 200 mg/kg. At the onset of black rot, mix with 60% bacteriostatic or 35% sylin, add 50% thiram 1:1, and add 500 times to prepare water. The mites can be sprayed with a 5% solution of 50% anti-Citrus WP. Pieris rapae were sprayed with 20% cypermethrin EC 1500 times solution. Usually spray once every 6 to 7 days. Spray 2 to 3 times.
reward
In the middle of July, the basic package of the leaf ball can be harvested in real time.
Garlic cultivation points
Pre-broadcast
Choose excellent early-maturing multi-valve garlic, separate the garlic seedlings before planting, classify according to large, medium and small petals, and soak them in cold water for 12~14h to break the garlic dormancy.
Sowing at the right time, rational fertilization from late July to early August. Before planting, 205,000 kg of farmyard manure per hectare, 300 kg of urea, 750 kg of superphosphate and 225 kg of potassium. Open a ditch of 30 to 40 cm wide every 30 om. In the ditch, the garlic was planted at a row spacing of 10 cm and a plant spacing of 5 cm, and then covered with 1 to 1.5 om of fine soil, and the water was immersed once. After that, pour 2 to 3 times of water according to the sensation. When the seedling height is 20cm, the soil is 2~4cm fine soil. At the later stage, 0.5% potassium dihydrogen phosphate and 0.5% urea mixed solution were sprayed 2 to 3 times at intervals of 5 to 7 days.
Pest Control
Rust choice triadimefon 15% WP 1500 times or Mancozeb 70% WP 1000 times spraying.
When the weather turns cold in late September, the greenhouse film is buckled and the management is strengthened. The temperature in the shed is between 8 and 20 °C. When the garlic shoots grow to about 50cm, they can be harvested and listed.
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