Leaf is a vegetable that is warm and fertile, and its suitable growth temperature is 15--25 ° C. It can be planted in all seasons, from November of the current year to May of the following year as the best planting period.
1. Site preparation, sowing and nursery
1. Site preparation: The selection of seedling land requires sandy loam soil with loose soil, good air permeability, and water and fertilizer retention. After the seedlings are sun-dried by loosening the soil, the land should be prepared according to the 1.2-1.5 m package ditch, with a height of 25 cm. The soil on the surface of the border should be finely divided. The base of the seedling should be fully basal fertilizer, which is mainly rotted organic fertilizer. The basal fertilizer can be sown after fully mixed with the soil.
2. Sowing: It is required to select fresh and full-colored seeds, and do the pre-sowing treatment, re-seeding and germinating the seeds. The amount of seeds per mu is 0.1-0.12 kg.
3. Nursery: After sowing, cover the seeds with fine soil about 1 cm thick, and moisten with water. The seedlings are unearthed 3--10 days after sowing. When the seedlings grow to 2--3 true leaves, the seedlings should be planted. The seedlings should be carried out in sunny and warm weather.
Second, transplant seedlings and colonize. Fields where leaf lettuce is planted require easy irrigation and drainage, and sandy loam with neutral or slightly acid soils is suitable. After applying sufficient base fertilizer, the field is plowed and raked to prepare the soil. The width is 1.5 meters (including ditch). The width is 10 × 13 cm. The seedlings grow to 4--5 true leaves and can be transplanted and planted. , Planting 3500-4000 plants per mu. After transplantation, the root water was dripped.
3. Management of fertilizer and water. After the seedlings are planted, it is necessary to pay close attention to the management of fertilizer and water. The seedlings after planting should be sprayed with water every day on sunny days, for 3-4 days, to keep the borders moist, and to exclude water in the rainy days. It can be top-dressed 10-12 days after planting, requiring diligent application and thin application, using decomposed manure water as the *, and also applying compound fertilizer. Do not apply chemical fertilizers 10 days before harvest, so as not to reduce the quality.
Fourth, timely harvest. The leaf lettuce should be harvested in a timely manner. When it grows to 10--12 leaves, it is the * appropriate harvest period. At this time, the harvest is of the highest quality.
5. Prevention of plant diseases and insect pests. Diseases and insect pests of leaf lettuce include powdery mildew, stand blight, canker, aphids, cabbage worms, etc. Disease control drugs are: carbendazim, carbendazim, thiophanate, etc. Pest control drugs include trichlorfon and some pyrethroid pesticides.
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