Tips:

Choose high-yield varieties with strong heat resistance, slow response to sunlight, and difficulty in bolting, such as extra heat-resistant two-white lettuce. Seedlings are sown in late June, and the seedbed is chosen in a place with high, dry terrain and fertile soil. Soak the seeds before sowing to facilitate germination.

Reasonably dense planting, shade and moisturizing. After 4-5 true leaves of lettuce seedlings have unfolded in mid-to-late July, transplant them with soil in the evening or on a cloudy day. Generally, the row spacing is 33 cm and the plant spacing is 30 cm. Pay attention to transplanting small and large seedlings in stages. After planting, water the living plants enough, and cover the large scaffolding with a sunshade net to promote slowing down of the seedlings.

Apply sufficient base fertilizer and timely top dressing. It takes more than a month from planting to harvesting of lettuce. If there is a lack of fertilizer, the plants will grow poorly and are prone to early bolting, resulting in reduced yield and quality, so the base fertilizer must be sufficient.

Harvest at the right time. When the heart leaves of lettuce are even with the tips of the tallest leaves, they can be harvested and put on the market. The average yield per mu is 1,800-2,000 kilograms, and the income is about 3,000 yuan.

Introduction: Lettuce, also known as lettuce, is a lettuce species of the genus Lactuca in the Asteraceae family that can form a variant of fleshy tender stems. It is an annual herbaceous plant. Also known as stem lettuce, lettuce shoots, green bamboo shoots, and lettuce. Maternity period: January to April. Lettuce originates from the Mediterranean coast and was introduced to China around the fifth century. [1] The above-ground stems are edible. The bark of the stems is white-green, the flesh of the stems is crisp and tender, the young stems are green, and they turn white-green when mature. The main edible fleshy tender stems can be eaten raw, cold, stir-fried, dried or pickled, and the young leaves can also be eaten. The stems and leaves contain lettuce, which contains lettuce. It tastes bitter and has analgesic effect. Lettuce has strong adaptability and can be cultivated in spring and autumn or overwinter. It is mainly cultivated in spring and harvested in summer.

Planting time:

The lettuce in the Yangtze River Basin overwinters in the open field, mainly spring lettuce. It is usually sown in September-October in the autumn of the first year, and the seedlings are ready for use in 40-50 days. - 6 true leaves are planted, which can survive the winter safely. After returning to green in the next spring, there will be enough time to grow leaf clusters, and high yields can be achieved by harvesting in April-May.

Lettuce is a semi-cold-tolerant vegetable. It likes cold weather, is slightly tolerant of frost, is afraid of high temperatures, and does not grow well in hot seasons.

Lettuce is a long-day crop with sufficient light; it is sensitive to the acid-base reaction of the soil and is suitable for planting in slightly acidic soil.

The root system of lettuce is shallow, its absorption capacity is weak, and it has high requirements for oxygen. The soil for planting lettuce is sandy loam.

Pest control:

The fungus overwinters in the soil or on lettuce sown in autumn, and can also be carried on seeds. Generally, the disease is serious in plots with low temperatures, rain, dew, fog, little light, single varieties, poor disease resistance, insufficient base fertilizer, excessive density, and poor ventilation and drainage in spring and autumn.

Agricultural measures for prevention and control: Select disease-resistant varieties; rotate crops; properly control planting density: apply sufficient base fertilizer, increase the application of phosphorus and potassium fertilizers, strengthen water and fertilizer management in the seedling stage, dig ditches for drainage, use furrow irrigation for irrigation and fertilization, etc. to reduce the cost in the field. humidity. Prevent in time during the rosette period and remove diseased and dead bodies after harvest.

Seed dressing with 0.3% of the seed weight. Seed dressing can also be done with 25% retinoic acid (25% metalaxyl) or 50% thiram, metalaxyl manganese zinc and other chemicals.

Pharmaceutical control: spraying should be done at the early stage of the disease.