Lettuce is one of the first greens to grow in late winter, and its availability heralds the coming of spring. Then lettuce planting time is when? How many months? What are the detailed planting methods?

A, lettuce planting time

Lettuce adaptability is strong, half-cold, like cool environment, afraid of high temperature, so you can plant in the spring and fall seasons, and its planting time according to the local climate and temperature environment to choose. Spring lettuce planting time is April-May open field cultivation, fall lettuce in 9-10 planting, in the Yangtze River Basin can be safe overwintering.

Second, lettuce planting method

1, the whole ground fertilization

Lettuce root system is shallow, absorption capacity is weak, so the soil to choose loose sandy soil is good, choose the terrain is high, well-drained, dry plots of land in the sowing before the application of adequate fertilizer, and then deep turning, will be knocked out of the soil pinched and crushed, and then the whole leveling and thinning, cover a layer of mulching ready for planting.

Pay attention to the lettuce elongation and expansion of the early, middle and late in the application of nitrogen fertilizer and potash, each time per mu of urea 15 ~ 20 kg, potassium sulfate 8 ~ 10 kg, or the application of potassium nitrate 20 ~ 25 kg, water or methane or composting rotting human and animal manure 150 ~ 200 times, evenly sprinkled in the lettuce plants around the roots of the soil, in order to fertilizer completely penetrate into the soil does not flow out! The fertilizer solution should be completely penetrated into the soil without flowing out. In addition, during the period of lettuce elongation and expansion, foliar spraying of 0.3% urea, 600 times of potassium amino acid mixture, or 0.5% potassium nitrate water solution should be applied every 7 to 10 days, 2 to 3 times in a row. Evenly spray wet all the leaves, to begin to have water droplets dripping down as appropriate, from the foliage to supplement nitrogen fertilizer and potassium fertilizer.

2, sowing

In order to ensure that the seeds can successfully germinate, need to be treated before sowing the seeds, the seeds will be placed in the water soaked for about 6 hours, and then wrapped in a wet towel to start germination. After germination can be sown, lettuce seeds are relatively small, so when sowing the environment will be fine soil stirred evenly after sowing, before sowing the soil watering a thorough, an average of 2-3 grams of seed per square meter, after sowing a layer of fine soil can be covered with a shallow layer. Cover a layer of film after sowing, insulation and moisture to speed up the germination, careful observation, when the seedlings out of the soil, immediately lift off the film, maintain ventilation and light, until the seedlings grow about 3 pieces of true leaves can be planted.

3, planting management

planting in order to ensure that it grows fast and strong, should maintain the spacing and row spacing of 25cm × 30cm, timely watering, to promote the development of the root system, to keep the soil moist, if the planting is a high temperature in the summer period, the appropriate shade, so as to avoid injury to the seedlings. In the application of adequate bottom fertilizer after the basic no fertilization, can be combined with plowing or weeding when the application of one or two times the farm light fertilizer can be, and also pay attention to plowing must be shallow roots, it is not on the undeveloped root system, plowing is too deep, it will damage its root system.

Three, lettuce mycosis how to control?

Lettuce mycosis, is one of the main diseases of lettuce. It's a disease that occurs at the base of the stem where it touches the soil, and under high humidity it produces a white cottony mycelium, which is soft and odorless, and later forms a black kernel of rat feces on the surface of the rhizome, which can cause the death of the whole plant in severe cases. low temperatures and high humidity in the middle and end of November can easily contribute to the occurrence and prevalence of this disease.

Control measures

1. Agricultural control: the use of mulch cultivation, strengthen ventilation, less nitrogen fertilizer.

2. Pharmaceutical control: Seed disinfection before sowing, with 2.5% chlorothalonil suspension seed coating agent (Silex), according to the seed weight of 4 ‰ ~ 5 ‰ of the concentration of the proportion of the seed coating treatment, coating and drying after sowing. In the early stage of the onset of the disease began to spray prevention and control, available 400 g / l pyrimethanil suspension (Shijiale) 800 ~ 1000 times; or 50% of the azoxystrobin water-dispersible granules (Kaiser) 800 ~ 1000 times; or 50% putrescine wettable powder (Sukerin) 600 ~ 800 times; or 50% of the vinyl mycophenolic acid wettable powder (Nongliline) 600 ~ 800 times, etc., every 7 to 10 days 1 time, 3 to 4 times in a row.