Autumn lettuce cultivation

Autumn lettuce is planted in summer, during the hot season, the seeds are difficult to germinate, it is not easy to be full of seedlings, the seedlings are long, the flower buds are differentiated early, and the bolting is rapid. Therefore, cultivating strong seedlings and preventing immature bolting are the key to the success of cultivation.

Select varieties of early-maturing varieties that are heat-resistant, fast-growing, and of good quality, such as special heat-resistant white skin, heat-resistant white tip leaves, and Zhengxing No.3.

Sowing seedlings are generally nursed and transplanted, and the planting period is from July to September; low temperature germination is required before sowing, and the vegetable farmers use the freezing method. After the seeds are soaked for 24 hours, they are wrapped in gauze and placed in a refrigerator or a refrigerator. Freeze at 3 ° C ~ 5 ° C for a day and night, then put it in a cool place, 2-3 days to germinate; can also use the hanging method, soak the seeds with cold water for 1-2 hours, go to "floating seeds", wrap with gauze Placed in the well 30 cm away from the water surface, take out the seeds and spray water 1 or 2 times a day, and germination for 3 to 4 consecutive days; create mild and humid conditions as much as possible after planting, build a shade shed, keep the seedbed moist; remove the film from the emergence Before planting, use 500 times 75% chlorothalonil spray every 7 to 10 days to prevent the occurrence of stagnation and disease; and time seedlings, after application, decomposed thin manure or potassium dihydrogen phosphate 0.1% The solution is topdressed 1 to 2 times to promote strong seedlings.

The seedling age is 25 to 30 days, and 4 to 5 true leaves are planted; the seedling age is too long, and the seedlings are easy to “squat”; the per mu mutilage and human and animal manure 4000 kg and compound fertilizer 50 kg, do 1.2 to 1.5 Rice sorghum; row spacing 30 ~ 35 cm, plant spacing 25 cm, planting 6000 ~ 7000 plants per acre; to the tender plant listed, the density can be doubled, the row spacing is 20 × 15 cm.