When to sow lettuce? Detailed guide to planting time and methods
Lettuce planting time
Under normal conditions, lettuce is suitable for cultivation in both spring and autumn in North China and the Yangtze River Basin, and in South China it can be sown from September to February of the following year.
Lettuce growing tips
Head lettuce prefers a cool climate, with an optimal growing temperature of 15—20°C, and it is best suited to environments with a large day-night temperature difference and lower nighttime temperatures. The optimal temperature for head formation is 10—16°C. When the temperature exceeds 25°C, the inner leaves of the head will become necrotic and rot due to high temperatures, and growth will be poor. The seed germination temperature is 15—20°C; above 25°C, water absorption by the seed coat is blocked and germination is poor. When sowing lettuce in summer, low-temperature treatment is needed: after soaking the seeds, place them in the refrigerator's cold storage compartment to germinate, and sow after the sprouts emerge white. Before sowing, the seeds should be treated with New High Lipid Film seed dressing. Loose-leaf lettuce is relatively heat-tolerant, but in high-temperature seasons it also grows poorly. Lettuce prefers slightly acidic soil (pH 6—6.3 is best), and cultivation in sandy loam or clay loam with strong water retention and good drainage is optimal. Lettuce needs more nitrogen fertilizer, so before planting, more organic fertilizer should be applied as base fertilizer; during the growing process, no more organic fertilizer is applied. Water must not be lacking during the growing period, especially during the head-forming stage of head lettuce, when sufficient water is needed. If there is drought and water shortage, not only will the head be small, but the leaves will also taste bitter and the quality will be poor. However, water must not be excessive either, otherwise the head will split and scatter, affecting appearance quality, and it can also easily lead to soft rot and sclerotinia disease. Only with proper water and fertilizer management, and timely spraying of Zhuangjingling during the growth stage, can high-yield, high-quality lettuce be obtained.
When is the best time to plant lettuce? Lettuce planting time and methods
Lettuce, also known as leaf lettuce, wochai, and goose lettuce, is an annual or biennial herbaceous plant of the genus Lactuca in the Asteraceae family. Lettuce is one of the vegetables that everyone loves very much. It is crisp and tender with a slightly sweet taste and a unique flavor. It also has effects such as clearing heat and refreshing the mind, and relieving pain and inducing sleep, giving it high cultivation value. So, when is the best time to plant lettuce? How should it be planted? The planting time and methods of lettuce are introduced as follows.
Image: Lettuce planting
I. Lettuce planting time
Lettuce prefers a cool climate, so the sowing time is generally in spring and autumn. In spring, sowing generally begins from February to April, and harvesting can be done from May to June. For autumn sowing, sowing can begin at the end of August, and harvesting can be done from September to October. Because different varieties of lettuce have different characteristics, when choosing the sowing time, you should first read the instructions for the lettuce seeds you bought, and then sow according to the above sowing times. Spring and summer are suitable for sowing loose-leaf lettuce (such as butterhead lettuce and colorful leaf lettuce), which is more heat-tolerant. Autumn and winter are suitable for sowing head lettuce (also called Western lettuce), which is not heat-tolerant.
Image: Lettuce planting
II. Lettuce planting methods
1. Select and sow good seeds:Choose suitable varieties according to your needs, such as glass lettuce, Emperor, Caesar, head lettuce, oakleaf lettuce, Great Lakes 659, etc.
2. Prepare the seedbed:For lettuce seedling raising, it is advisable to choose fertile sandy loam with good water and fertilizer retention. Seedbed soil preparation: for a 10 sq m seedbed, use 10 kg of decomposed organic fertilizer, 0.3 kg of ammonium sulfate, 0.5 kg of superphosphate, and 0.2 kg of potassium sulfate. Mix thoroughly, spread evenly, rake fine, water thoroughly, and sow after the water seeps in.
3. Sowing and seedling raising:To make broadcasting even, a small amount of fine sandy soil can be mixed into the seeds when sowing. After sowing, cover with 0.3-0.5 cm of moist soil and cover with plastic film to retain moisture. The sowing rate is 30-50 g per mu. When the seedlings begin to emerge, promptly uncover the plastic film on the bed surface to prevent leggy growth. The seedbed temperature should be controlled at 18°C-20°C during the day and 12°C-14°C at night. Pay attention to ventilation; if there is strong sunlight, shade is needed. When the seedlings grow to 2-3 true leaves, thin them by spacing plants and rows 6-8 cm apart. When they grow to 4-5 true leaves, they can be transplanted. During the seedling stage, generally do not water unless there is a water shortage.
Image: Lettuce planting
4. Scientific fertilization:Lettuce requires clay loam rich in organic matter with strong water and fertilizer retention. Lettuce prefers slightly acidic soil, with a soil pH of 5-7 being suitable. For every 1000 kg of lettuce produced, it needs to absorb 2.5 kg of nitrogen, 1.2 kg of phosphorus, and 4.5 kg of potassium, among which head lettuce needs more potassium. During the growing period, nitrogen, phosphorus, and potassium fertilizers need to be used in combination. The plot where lettuce is to be planted should be deeply plowed and carefully prepared. Before transplanting, apply sufficient base fertilizer, 3000-3500 kg of decomposed farmyard manure per mu. After application, plow deeply, water thoroughly, and make beds after the soil dries.
5. Careful transplanting:One day before transplanting, irrigate the seedbed to moisten the seedling blocks. On the second day, lift the seedlings with as much soil as possible to reduce root damage. When transplanting, first open furrows on the bed surface, 4-6 cm deep, and plant 3 rows on a 70 cm bed. After opening the furrows, apply 25 kg per mu of ternary compound fertilizer, then irrigate. After the water seeps in, place the seedlings at a spacing of 24 cm, cultivate soil, and close the furrows. Rake the bed surface level, cover with plastic film, and guide the seedlings out through the film.
6. Post-planting management:Lettuce prefers moisture and requires a sufficient water supply throughout the entire growth period. Water once with recovery water 5-7 days after transplanting. After watering with recovery water, plots without plastic film mulch should be cultivated, loosened, and weeded twice. After that, water 3-4 times, and apply nitrogen and phosphorus fertilizers in stages along with watering, at 15-20 kg per mu. Stop watering before harvest to facilitate storage and transport.
Image: Lettuce planting
7. Pest and disease control:The main diseases of lettuce include downy mildew, soft rot, viral disease, and sclerotinia disease, among which sclerotinia disease and soft rot are more harmful. Crop rotation can be adopted, planting density appropriately reduced, watering not excessive, frequent shallow hoeing and raking carried out, and the soil surface kept dry. Diseased plants should be pulled out promptly, and dead leaves removed and burned in a centralized manner. After disease onset, agricultural streptomycin and amobam can be sprayed. In hot and humid seasons, spraying chlorothalonil once every 5-7 days can serve as prevention. The main pests include aphids, thrips, and cutworms, which can be controlled with omethoate, fenvalerate, and the like.
8. Scientific harvesting:Non-heading lettuce can be harvested at the appropriate time according to market prices. Head lettuce is best harvested after the head is firm. Harvesting too early will affect yield, while harvesting too late will cause the stem inside the head to elongate, the head to loosen, and quality to decline.
[Editor's concluding remarks]Lettuce likes a cool environment and is neither cold-tolerant nor heat-tolerant, so special attention is needed during cultivation. The above has introduced the planting time and methods of lettuce for everyone. Have you all learned them?
How to plant lettuce seeds? Lettuce sowing methods and cultivation management
Lettuce is a raw vegetable that people often eat, and it is the common name for leaf lettuce. Lettuce is crisp, tender, and refreshing, with a slightly sweet taste. It also has effects such as lowering cholesterol and relieving pain and inducing sleep, and helps promote blood circulation and clear the liver and gallbladder, so it is deeply favored by consumers. In the process of growing lettuce, seed propagation is mostly used, so anyone who wants to grow it needs to pay close attention. So, how do you plant lettuce seeds? The sowing methods and cultivation management of lettuce are introduced as follows.
Image: Lettuce planting
I. Lettuce sowing methods
1. Sowing time:Generally, the sowing period for lettuce is from August to February of the following year, with suitable sowing from mid-October to mid-December. Sowing is also possible from early March to early July, but the growth period is short and the yield is low. In winter and early spring, cultivation is carried out in large or small greenhouses, and in summer, cultivation is carried out under shade nets or shaded sheds. For the seedling-raising plot, apply 1500 kg of decomposed farmyard manure and 20 kg of superphosphate per 60 sq m, then plow and mix evenly and level. For seedling raising and transplanting, each mu of cultivation field requires 20-30 sq m of seedbed and 25-30 g of seed.
2. Seed germination:When sowing lettuce in high-temperature seasons, the seeds must undergo low-temperature germination. First soak them in well water for about 6 hours, rub and wash them, take them out, wrap them in wet gauze, and place them at 15-18°C for germination, or hang them in a water well for germination, or place them in a refrigerator (temperature controlled at about 5°C), then after 24 hours place the seeds in a cool place to germinate with insulation. You can also soak the seeds in a 0.2 per thousand "920" solution for 24 hours, which can smoothly break the dormancy of lettuce seeds, and germination will be complete in 2-3 days. When 80% of the seeds have sprouted white, they should be sown promptly.
3. Sowing and seedling raising:To make broadcasting even, a small amount of fine sandy soil can be mixed into the seeds when sowing. After sowing, cover with 0.3-0.5 cm of moist soil and cover with plastic film to retain moisture. The sowing rate is 30-50 g per mu. When the seedlings begin to emerge, promptly uncover the plastic film on the bed surface to prevent leggy growth. The seedbed temperature should be controlled at 18°C-20°C during the day and 12°C-14°C at night. Pay attention to ventilation; if there is strong sunlight, shade is needed. When the seedlings grow to 2-3 true leaves, thin them by spacing plants and rows 6-8 cm apart. When they grow to 4-5 true leaves, they can be transplanted. During the seedling stage, generally do not water unless there is a water shortage.
4. Seedling raising and transplanting:Before sowing, water the seedbed thoroughly. Mix the seeds evenly with an equal amount of wet fine sand and broadcast. Cover with a thickness of about 0.5 cm. When there are 2-3 true leaves, thin or transplant in time. In winter and spring, when raising seedlings in greenhouses or open fields, pay attention to keeping the seedbed warm, and at the same time control the amount of watering to prevent excessive humidity. In summer open-field seedling raising, pay attention to covering with a shade net and sprinkling water 2-3 times a day to keep the soil moist.
Image: Lettuce planting
II. Lettuce cultivation management
1. Scientific fertilization:Lettuce requires clay loam rich in organic matter with strong water and fertilizer retention. Lettuce prefers slightly acidic soil, with a soil pH of 5-7 being suitable. For every 1000 kg of lettuce produced, it needs to absorb 2.5 kg of nitrogen, 1.2 kg of phosphorus, and 4.5 kg of potassium, among which head lettuce needs more potassium. During the growing period, nitrogen, phosphorus, and potassium fertilizers need to be used in combination. The plot where lettuce is to be planted should be deeply plowed and carefully prepared. Before transplanting, apply sufficient base fertilizer, 3000-3500 kg of decomposed farmyard manure per mu. After application, plow deeply, water thoroughly, and make beds after the soil dries.
2. Careful transplanting:One day before transplanting, irrigate the seedbed to moisten the seedling blocks. On the second day, lift the seedlings with as much soil as possible to reduce root damage. When transplanting, first open furrows on the bed surface, 4-6 cm deep, and plant 3 rows on a 70 cm bed. After opening the furrows, apply 25 kg per mu of ternary compound fertilizer, then irrigate. After the water seeps in, place the seedlings at a spacing of 24 cm, cultivate soil, and close the furrows. Rake the bed surface level, cover with plastic film, and guide the seedlings out through the film.
3. Post-planting management:Lettuce prefers moisture and requires a sufficient water supply throughout the entire growth period. Water once with recovery water 5-7 days after transplanting. After watering with recovery water, plots without plastic film mulch should be cultivated, loosened, and weeded twice. After that, water 3-4 times, and apply nitrogen and phosphorus fertilizers in stages along with watering, at 15-20 kg per mu. Stop watering before harvest to facilitate storage and transport.
4. Pest and disease control:The main diseases of lettuce include downy mildew, soft rot, viral disease, and sclerotinia disease, among which sclerotinia disease and soft rot are more harmful. Crop rotation can be adopted, planting density appropriately reduced, watering not excessive, frequent shallow hoeing and raking carried out, and the soil surface kept dry. Diseased plants should be pulled out promptly, and dead leaves removed and burned in a centralized manner. After disease onset, agricultural streptomycin and amobam can be sprayed. In hot and humid seasons, spraying chlorothalonil once every 5-7 days can serve as prevention. The main pests include aphids, thrips, and cutworms, which can be controlled with omethoate, fenvalerate, and the like.
5. Scientific harvesting:Non-heading lettuce can be harvested at the appropriate time according to market prices. Head lettuce is best harvested after the head is firm. Harvesting too early will affect yield, while harvesting too late will cause the stem inside the head to elongate, the head to loosen, and quality to decline.
[Editor's concluding remarks]Doing a good job in sowing and propagating lettuce is the foundation for successfully growing lettuce, and farmers should pay attention to it. The above has introduced the sowing methods and cultivation management of lettuce for everyone, and I hope it can help you!