The leaf is a vegetable that is warm and fertile, and its suitable growth temperature is 15--25 ° C. It can be planted in all four seasons, with November to May the following year as the most suitable planting period.

I. Land preparation, seeding and seedling raising

1. Land preparation: The selection of seedlings requires sandy soil with loose soil, good air permeability, and water and fertilizer retention. After the seedlings are bleached with loose soil, they shall be hoisted according to 1.2-1.5 meters of ditch, and the loquat shall be 25 cm high. Seedlings should be fully basal fertilizers, mainly rotten organic fertilizers. The basal fertilizers and soil can be fully mixed before seeding.

2. Sowing: It is required to choose fresh and full-colored seeds, and do a good job of pre-seeding treatment. The seeds are sunning and germinated. The amount of seeds per mu is 0.1-0.12 kg.

3. Seedling cultivation: After sowing, cover the seeds with a thickness of about 1 cm and drench with water to keep them moist. The seedlings are unearthed 3 to 10 days after sowing. When it grows to 2--3 true leaves, thinning should be carried out. Thinning should be carried out in sunny and warm weather, and watering and seedlings should be drenched immediately after thinning.

Second, transplant seedlings. Fields for planting lettuce for leaves require the selection of convenient drainage and irrigation, and sandy loam soil with a neutral or slightly acidic pH. The field is prepared by raking the ground after applying basic fertilizer. The width of the hoe is 1.5 meters (including ditch), and it is planted horizontally after hoeing. The size is 10 × 13 cm. When the seedlings grow to 4--5 true leaves, they can be transplanted and planted , Planting 3500--4000 plants per acre. After transplantation, drench the foot with root water.

Third, fertilizer and water management. After the vegetable seedlings are planted, it is necessary to grasp the fertilizer and water management in a timely manner. The seedlings after planting should be watered every day for 3 to 4 days on a sunny day, to keep the moist surface moist, and to eliminate field water on rainy days. 10 to 12 days after planting, fertilizer can be topdressed. Difficult and thin application is required, and rotten manure water is used as a fertilizer. Compound fertilizer can also be applied. Do not apply chemical fertilizer 10 days before harvesting to avoid degrading quality.

Fourth, timely harvest. The leaf lettuce should be harvested in a timely manner. When it grows to 10-12 leaves, it is the most suitable harvest period. At this time, the quality is high.

Fifth, pest control. The diseases and insect pests that occur on leaf lettuce are: powdery mildew, blight, ulcer, aphid, cabbage worm and so on. Disease prevention and treatment drugs include: carbendazim, mirex, tobbutin, etc. Pest control drugs include trichlorfon and some pyrethroid pesticides.

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