Lettuce is leafy lettuce, a kind of agronomy crop lettuce, containing more iron, special effects on scurvy. 1. Variety. The lettuce varieties planted in Guangzhou include: “Man Li Bao Xin Cai Caiâ€, “Uprightâ€, “Red Leavesâ€, “Creamâ€, “Xiang Juâ€, local “Glass Lai Laiâ€, “Niu Li Lettuce†and so on. 2. Cultivation season. Lettuce is a cold-resistant, low-light-resistant crop that is not tolerant of high temperatures, and the optimum temperature for growth is 15 to 20°C. The suitable temperature for the ball is 17 to 18°C, and the temperature is more than 20°C. The planting period in Guangzhou is from September to May of the following year. In recent years, facilities have been cultivated and can be planted in summer, but the yield is low. 3. Cultivation methods. There are many ways to cultivate lettuce, commonly used in substrate cultivation. NET and DFT cultivation, and DFT culture better. 4. Nursery and colonization. (1) nursery. Lettuce is difficult to germinate at temperatures above 25°C. Its seed coat will impede the entry of oxygen, making it difficult to germinate seeds. Over 28°C will completely inhibit germination. Therefore, sowing should be done in a thermostatic chamber at 15-20°C for germination. After germination, the seeds are directly sown in a colonization cup or a seedling tray containing the fixed objects. When the seedlings grow to 2-3 leaves, they are moved onto the colonization cups, which generally takes 15 to 20 days. (2) Colonization. When the seedlings grow to 6-7 leaves, they are planted on a cultivation bed and 40 plants per square meter are planted. 5. Nutrient solution management. (1) Nutrient solution formulation. Formulation B developed by the Japanese garden test formula or Guangzhou Vegetable Research Institute can make lettuce grow well. Lettuce is not sensitive to changes in iron content in the nutrient solution and is not prone to iron deficiency symptoms. Other leafy vegetables such as chives are prone to iron deficiency symptoms. (2) Nutrient concentration. The concentration of nutrient solution, ie, EC, is generally controlled between 1 and 2.5 millisiemens/cm, and is high in the early-late and late-middle stages. (3) nutrient solution pH adjustment. The appropriate pH is generally between 5.5 and 7, pH 6. Harvest. When the plants reach the harvesting standards, they should be harvested in time. Variety and climatic conditions have a certain impact on the harvest period, lettuce cultivation is generally planted 35 to 45 days after planting can be harvested, summer planting generally 25-30 days after planting harvest.
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