Autumn lettuce is planted in summer, during the high temperature 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 convulsions are rapid. Therefore, cultivating strong seedlings and preventing immature convulsions are the key to the success of cultivation. The technical points of cultivation are now introduced as follows:
Select varieties Use early-maturing varieties with heat resistance, fast growth and good quality, such as special heat-resistant white skin, heat-resistant white tip leaves, Zhengxing No.3 and so on.
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, germination can be carried out in 2 to 3 days; you can also use the hanging method to soak the seeds for 1 to 2 hours with cold water, go to "floating seeds" and wrap them in 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.
Planting and fertilizing seedling age 25 to 30 days, 4 to 5 true leaves when planting; seedling age is too long, the seedlings are easy to "squat"; per mu of composting compost and human and animal manure 4000 kg and compound fertilizer 50 kg, do 1.2 ~ 1.5 Rice sorghum; row spacing 30 ~ 35 cm, plant spacing 25 cm, planting 6000 ~ 7000 plants per acre; listed with tender plants, the density can be doubled.
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