When will the lettuce be sown? Planting time and method of lettuce

lettuce planting time

lettuce normal conditions in North China and the Yangtze River Basin can be cultivated in spring and autumn, South China from September to February of the following year can be planted.

lettuce growing tips

The head lettuce likes cold climate, the suitable temperature for growth is 15-20℃, the most suitable temperature difference between day and night, low temperature environment at night. The optimum temperature for bulb formation is 10-16℃, and if the temperature exceeds 25℃, the inner leaf bulb will cause necrosis and decay due to high temperature, and the growth will be poor. The germination temperature of seeds is 15-20℃, higher than 25℃, because the seed coat is blocked from absorbing water, the germination is poor. lettuce in summer sowing needs low temperature treatment, after soaking in the refrigerator in the cold room germination, to bud after white re-sowing, before sowing the application of new lipid membrane seed dressing. Loose leaf lettuce is more heat-resistant, but in high temperature season, it also grows poorly. Lettuce likes slightly acidic soil (pH6-6.3 is the best), and sandy loam or clay loam with strong water retention and good drainage is the best cultivation. Lettuce needs more nitrogen fertilizer, so before planting base fertilizer should be more organic fertilizer, growth process, no longer apply organic fertilizer. During the growth period can not be water shortage, especially in the ball stage of lettuce, need sufficient water, such as dry early water shortage, not only small leaves, and bitter leaves, poor quality. However, the water content should not be too much, otherwise the leaf ball will spall, affect the appearance quality, but also easily lead to soft rot and sclerotinia. Only proper water and fertilizer management, and timely spraying strong stem spirit in the growth stage, can obtain high yield and high quality lettuce.

When is lettuce ready to grow? How and when to grow lettuce

Lettuce, also known as leaf lettuce, cabbage, goose cabbage, etc., is an annual or biennial herb of lettuce genus Compositae. Lettuce is one of our favorite vegetables, crisp and tender texture and slightly sweet, unique flavor, but also has the effect of clearing heat, refreshing, analgesic hypnosis, etc., planting value is high. So, when is lettuce good to grow? How should I plant it? The planting time and method of lettuce are described as follows.

Photo: Lettuce cultivation

1. Growing time of lettuce

Lettuce likes cold climate, so sowing time is generally spring and autumn two seasons, spring generally in February to April to start sowing, May to June can be harvested, and autumn sowing can start sowing at the end of August, September to October can be harvested, because different varieties of lettuce characteristics are different, in the selection of sowing time, to first understand the description of the lettuce seeds bought, and then combine the above sowing time for sowing. Spring and summer season suitable for sowing loose leaf lettuce (such as cream lettuce, color leaf lettuce), more heat-resistant, autumn and winter season suitable for sowing head lettuce (also known as western lettuce), heat-resistant.

Photo: Lettuce cultivation

2. Cultivation methods of lettuce

1. Selection and sowing of improved varieties: to select appropriate varieties according to needs, such as glass lettuce, emperor, Caesar, head lettuce, mosaic lettuce, Lake 659 and so on.

2. Preparation seedbed: lettuce seedlings should be selected water conservation, good fertility, fertile sandy loam. Bed soil preparation: 10 square meters of seedbed with decomposed organic fertilizer 10 kg, ammonium sulfate 0.3 kg, calcium superphosphate 0.5 kg, potassium sulfate 0.2 kg, fully mixed evenly, raked fine, irrigated sole water, water infiltration after sowing.

3. Sowing and seedling raising: In order to make the sowing uniform, a small amount of fine sand soil can be mixed into the seeds when sowing, covered with 0.3~0.5 cm thick tidal soil after sowing, and covered with plastic film to keep moisture. Sowing amount per mu is 30~50 grams. When seedlings begin to emerge, they should be uncovered in time to prevent excessive growth. The seedbed temperature should be controlled at 18℃~20℃ during the day and 12℃~14℃ at night. Pay attention to ventilation and ventilation. In case of strong light exposure, shade is required. When seedlings grow to 2~3 true leaves, seedlings are divided according to plant spacing of 6~8 cm. When seedlings grow to 4~5 true leaves, they can be planted. Generally, seedlings do not lack water or water.

Photo: Lettuce cultivation

4. Scientific fertilization: lettuce requirements rich in organic matter, water and soil fertility strong clay loam, lettuce hi slightly acidic, soil pH 5~7 is appropriate. For every 1000 kg of lettuce produced, 2.5 kg of nitrogen, 1.2 kg of phosphorus and 4.5 kg of potassium need to be absorbed, of which the head lettuce needs more potassium. The growth period needs nitrogen, phosphorus and potassium fertilizer to be used together. The plot of lettuce planting should be deeply ploughed and cultivated carefully. Before planting, apply sufficient base fertilizer, apply decomposed farm manure 3000~3500 kg per mu, turn deep after application, irrigate sole water, and make bed after seeing dryness.

5. Careful planting: irrigate the seedbed one day before planting to make the seedlings moist, and take as much soil as possible the next day to reduce root damage. When planting, ditch is first dug on the ridge surface, the ditch depth is 4 - 6cm, three rows are planted on the 70cm ridge surface, after ditching, ternary compound fertilizer is applied according to 25kg per mu, irrigation is carried out, seedlings are placed according to the plant spacing of 24cm after water infiltration, the ditch is sealed, the ridge surface is raked flat, plastic film is covered, and seedlings are introduced out of the film.

6. Post-plant management: lettuce likes moisture, and adequate water supply is required throughout the growth period. 5~7 days after planting, irrigate seedling slowing water once. After watering the seedlings, the plots without plastic film were tilled and weeded twice. After 3~4 times of watering, combined with watering stage topdressing nitrogen, phosphorus, 15~20 kg per mu. Stop watering before harvest to facilitate storage and transportation.

Photo: Lettuce cultivation

7. Disease and pest control: the main diseases of lettuce are downy mildew, soft rot, virus disease and sclerotinia disease, among which sclerotinia disease and soft rot are more harmful, rotation can be adopted, planting density should be reduced appropriately, watering should not be too much, often shallow hoe, keep the soil surface dry, find diseased plants pulled out in time, remove dead leaves and burn them intensively, spray agricultural streptomycin and ammonium demorbate after the disease occurs, spray chlorothalonil every 5~7 days in high temperature and high humidity season for prevention purposes. Insect pests are mainly aphids, thrips, cutworms, etc., with omethoate, speed kill Ding and other control.

8. Scientific harvest: non-heading lettuce can be harvested in time according to market price. It is better to harvest heading lettuce after leaf bulb is tight. Early harvest will affect yield, and late harvest will result in stem elongation and loose leaf bulb quality decline.

Lettuce likes cold environment, neither cold nor heat, need special attention in the planting process. The above introduces the planting time and method of lettuce for everyone. Have you learned it?

How to grow lettuce seeds? Sowing method and planting management of lettuce

Lettuce is a raw vegetable that people usually eat. It is commonly known as lettuce for leaves. Lettuce crisp and refreshing, slightly sweet taste, but also has the effect of lowering cholesterol, analgesic hypnosis, etc., conducive to promoting blood circulation, clearing liver and benefiting cholesterol, so it is favored by consumers. In the process of planting lettuce, the method of seed reproduction is mostly adopted. If you want to plant lettuce, you need to pay more attention to it. So, how do you plant lettuce seeds? The sowing method and planting management of lettuce are introduced as follows.

Photo: Lettuce cultivation

1. Seeding method of lettuce

1. Sowing time: The general sowing period of lettuce is August to February of the following year, suitable for sowing from mid-October to mid-December, early March and early July can also be sown, but the growth period is short and the yield is low. In winter and early spring, it is cultivated in greenhouse or shed, and in summer, it is cultivated in shade net or shed. 1500kg of decomposed farm manure and 20kg of calcium superphosphate shall be applied to every 60m2 of seedling field, and shall be mixed evenly after ploughing. Seedling transplanting requires 20-30 square meters of seedbed per mu of cultivated field, and the amount of seed used is 25-30 grams.

2. Seed germination: lettuce high temperature season sowing seeds must be low temperature germination, first soak in well water for about 6 hours, wash and pick up with wet gauze wrapped, placed at 15-18℃ temperature germination, or hanging in the well germination, or put in the refrigerator (temperature control at 5℃), 24 hours later, then put the seeds in the shade insulation germination. Also available concentration of 0.2 per thousand "920" solution soaking for 24 hours, can successfully break the lettuce seed dormancy, 2-3 days can sprout, 80% of the seeds should be timely sowing white.

3. Sowing seedling: In order to make the sowing uniform, a small amount of fine sand soil can be mixed into the seeds when sowing, and the 0.3-0.5 cm thick tidal soil can be covered after sowing, and the plastic film is covered to keep moisture. Sowing rate per mu is 30- 50g. When seedlings begin to emerge, they should be uncovered in time to prevent excessive growth. The seedbed temperature should be controlled at 18℃-20℃ in daytime and 12℃-14℃ at night. Pay attention to ventilation and ventilation. In case of strong light exposure, shade is required. When seedlings grow to 2-3 true leaves, seedlings are divided according to plant spacing of 6-8 cm. When seedlings grow to 4-5 true leaves, they can be planted. Generally, seedlings do not lack water or water.

4. Seedling transplanting: before sowing, irrigate enough water on the seedbed, mix the seeds with the same amount of wet fine sand and broadcast them, cover them with a thickness of about 0.5 cm, and thin the seedlings in time with 2-3 true leaves. Winter, spring greenhouse or open field seedlings should pay attention to seedbed insulation, at the same time should control the amount of watering, prevent excessive humidity. Summer open field seedlings, pay attention to the use of shade net cover, drench 2-3 times a day, so that the soil moist.

Photo: Lettuce cultivation

II. Cultivation management of lettuce

1. Scientific fertilization: lettuce requirements rich in organic matter, water conservation fertility strong clay loam, lettuce hi slightly acidic, soil pH 5-7 is appropriate. For every 1000 kg of lettuce produced, 2.5 kg of nitrogen, 1.2 kg of phosphorus and 4.5 kg of potassium need to be absorbed, of which the head lettuce needs more potassium. The growth period needs nitrogen, phosphorus and potassium fertilizer to be used together. The plot of lettuce planting should be deeply ploughed and cultivated carefully. Before planting, apply sufficient base fertilizer, apply decomposed farm manure 3000-3500 kg per mu, turn deep after application, irrigate sole water, and make bed after seeing dryness.

2. Careful planting: irrigate the seedbed one day before planting to make the seedlings moist, and take as much soil as possible the next day to reduce root damage. When planting, ditch is first dug on the ridge surface, the ditch depth is 4- 6cm, three rows are planted on the 70cm ridge surface, after ditching, ternary compound fertilizer is applied according to 25kg per mu, irrigation is carried out, seedlings are placed according to the plant spacing of 24cm after water infiltration, the ditch is sealed, the ridge surface is raked flat, plastic film is covered, and seedlings are introduced out of the film.

3. Post-plant management: lettuce likes moisture, and adequate water supply is required throughout the growth period. 5-7 days after planting, irrigate seedling slowing water once. After watering the seedlings, the plots without plastic film were tilled and weeded twice. After watering 3-4 times, nitrogen and phosphorus fertilizer are applied in stages combined with watering, and 15-20 kg is applied per mu. Stop watering before harvest to facilitate storage and transportation.

4. Disease and pest control: the main diseases of lettuce are downy mildew, soft rot, virus disease and sclerotium disease, among which sclerotium disease and soft rot are more harmful, rotation can be adopted, planting density should be reduced appropriately, watering should not be too much, often shallow hoe, keep soil surface dry, find diseased plants pulled out in time, remove dead leaves and burn them intensively, spray agricultural streptomycin and ammonium bromide after the disease occurs, spray chlorothalonil every 5-7 days in high temperature and high humidity season for prevention purposes. Insect pests are mainly aphids, thrips, cutworms, etc., with omethoate, speed kill Ding and other control.

5. Scientific harvest: non-heading lettuce can be harvested in time according to market price. It is better to harvest heading lettuce after leaf bulb is tight. Early harvest will affect yield, and late harvest will result in stem elongation and loose leaf bulb quality decline.

Do a good job of sowing and breeding lettuce, is the basis for successful cultivation of lettuce, when causing farmers to plant. The above for everyone to introduce the lettuce planting method and planting management, I hope to help you!