Spring and autumn are most suitable for cultivation. If planted at high temperature, seeds need to germinate. The method is: soak the seeds first and then take them out.

Wrap it in wet gauze and put it in 15 ~ 20℃ refrigerator to accelerate germination. After 2 ~ 3 days, 30% of the seeds will germinate, and then you can sow.

The cultivated soil should be subdivided and sparse.

Scatter pine and seeds evenly on the culture soil, cover with a thin layer of soil after sowing, and pay attention to heat preservation and moisture retention. Generally, it germinates 2 ~ 3 days after sowing. About 2 after sowing

Sparse seedlings every week to remove weak seedlings and high seedlings. Transplant when there are 3 ~ 4 real leaves, and the seedling spacing can be about 20 cm. ?

Key points of cultivation management?

The light intensity of lettuce is moderate, too strong and too weak is not good for its growth. Different growth stages have different requirements for water, seedling stage

Too dry seedlings tend to age, and too wet seedlings tend to grow white. Lettuce with too much water is easy to crack, soft rot and Sclerotinia sclerotiorum during the formation of leaf bulbs. grow

It is advisable to keep the soil moist for a long time and water it 1 ~ 2 times a day, preferably once in the morning and once in the evening.

Water should be properly controlled during the nodulation period, and water must not accumulate. Postcolonial 6

Thin application of available nitrogen fertilizer from 0-7 days to promote the growth of hair roots and leaves. At the beginning of wrapping, phosphorus and potassium fertilizer should be added. During the growing period of lettuce, it is necessary

Loosening is often used for weeding, but because its root system is not deep underground, it should not be too deep to avoid damaging the root system. Besides, lettuce is rolled in new leaves.

Foliage should also be sprayed with 0.2% urea and 0.2% potassium dihydrogen phosphate.

Extended data:

What are the environmental requirements of lettuce?

1, temperature?

Lettuce is a kind of crop that likes cold and avoids high temperature. Its seeds can germinate above 4℃, and the optimum germination temperature is 15 ~ 20℃. The seedlings are tolerant to low temperature, and grow healthily at the daily average temperature of 65438 02℃. The optimum temperature for bulb growth is 65438 03 ~ 65438 06℃. However, at present, some varieties of lettuce can withstand high temperature, but it is best to harvest them in time before the rainy season.

2.light?

Lettuce is a long-day crop, and it needs plenty of sunshine during its growth. Insufficient light can easily lead to irregular or loose knots.

3. earth?

Although leaf lettuce has extensive adaptability to soil, in order to obtain good leaf bulbs, lettuce should choose fertile loam or sandy loam. If the soil sand is poor and the application of organic fertilizer is insufficient, it is easy to cause various physiological diseases.

Step 4: Moisture

The root system of lettuce is shallow in the soil, so it is required to have enough water supply before heading and keep the soil moist frequently. Low air humidity is required after granulation. If the soil moisture is too high or the air humidity is too high, soft rot is easy to occur.

Baidu encyclopedia-ball lettuce

Baidu Encyclopedia-the "Emperor" of Lettuce