How to grow lettuce in September? When and how to grow lettuce?

1. Planting time.

Lettuce is generally cultivated in spring and autumn, but the specific planting time has to be determined according to the actual local planting conditions, for example, the Yangtze River basin is mainly spring lettuce, which is generally sown in September and October of the first autumn.

2. Scientific sowing.

Select high-dry, well-drained plots as seedbeds, and apply 4000-5000 kg of decomposed organic fertilizer or 500 kg of compound fertilizer per mu as base fertilizer before sowing. When sowing, water the bottom of the foot, and after the water seeps down, mix the seeds with a small amount of fine sand or fine soil and mix well before sowing. After sowing, pay attention to covering the soil centimeters and cover the film tightly.

3. Colonization. At the seedling age of 25-30 days, when the 4-5** true leaves are grown, the row spacing of the planting is generally 30-35 cm, the plant spacing is 25 cm, and 6000-7000 plants are planted per mu.

4. Field management.

If the mulch film is covered for cultivation, the base fertilizer should be applied enough at one time, and the mulch film should be covered to prevent stains in rainy days. Greenhouse and open field cultivation, even in the warm weather 1-2 times, timely watering and top dressing, slow seedlings, apply Bika high nitrogen water-soluble fertilizer, after the appropriate reduction of watering, keep the soil moist.

5. Pest control.

The main diseases during the growth of lettuce are downy mildew, gray mold and sclerotinia sclerotinia disease, focusing on prevention, mainly to ensure that lettuce has a good growth environment, such as the temperature is 10-24, when the humidity is too large, timely ventilation and humidity. If necessary, take the drug in time, and use the drug scientifically according to the instructions of the drug.

6. Timely harvesting.

Young plants can be harvested at any time before the stem is fully hypertrophied, and when the heart leaves of lettuce are at the same level as the tip of the highest leaf, they can be harvested and marketed.

The planting time of lettuce, spring lettuce, greenhouse seedlings from December to March, and open field seedlings from mid-February to late March. Summer lettuce is cultivated in the open field from April to early to mid-May, and covered with shade nets from late May to July, and planted directly or at high density. Autumn lettuce is covered and sown with shade nets from July to September, and seedlings are transplanted.

Overwintering lettuce, seedlings in the open field from October to November.

1. Land preparation and planting.

The plot for planting autumn lettuce requires fertile soil, strong water and fertilizer retention capacity, and fine cultivation. Combined with the cultivated land, 3 5 square meters of farmhouse fertilizer per mu, 30 50 kg of compound fertilizer with high nitrogen, low phosphorus and medium potassium ratio, 10 20 kg of Bika microbial agent, 200 400 grams of trace element fertilizer, and the cultivated land was scraped back and then flattened. Then use a pickaxe to gouge the holes.

The distance between the holes (plant row spacing) is 35 40 cm, and the mu planing hole is about 5000. When the autumn lettuce seedlings grow to 5 to 6 true leaves, they can be planted. Try to choose cloudy or rainy days when planting, which is conducive to quickly slowing down the seedlings and improving the survival rate, so that the seedlings can be upright as much as possible during transplanting, avoid skewed, and water in time after planting.

2. Field management.

After watering the slow seedling water, when the ground is not dry, in line with the principle of one shallow and two deep, hoe twice. It should be noted that when hoeing and rowing, there are crooked seedlings, and the soil should be straightened in time, because the crooked seedlings will produce bent bamboo shoots, commonly known as "stick bamboo shoots", which will greatly reduce the commerciality of lettuce, and then affect the income. In case of heavy rainfall, after the rain is clear, hoeing should be done in time.

Lettuce prefers moist soil, so it should be properly watered to keep the soil moist. After planting lettuce, 20 kg of calcium ammonium nitrate and 1 kg of potassium dihydrogen phosphate were applied in combination with watering about 15 days and 10 days after lettuce planting.

3. Timely harvesting.

Autumn lettuce is harvested too early, which affects the yield and income, and the hollow sprouts are harvested too late when the leaves on the outer edge of the leaves before the sprouts are flush with the growth point.

Fourth, pest control.

The main diseases of autumn lettuce are downy mildew, soft rot, black rot and sclerotinia sclerotinia disease. In the early stage of the disease, spray 1000 times of downy mildew or 70% Antaisheng 600 times to prevent downy mildew, and spray 3 or 4 times in a row. Spray with 30% lithium copper humate 500 times or 14% copper ammonia aqueous 300 times liquid to control soft rot and black rot, and spray twice at an interval of 7 to 10 days.

Spray 50% Nonlilin 1000 times or 50% promethine 1000 times solution to prevent and control sclerotinia disease, and spray twice at an interval of 7 to 10 days. The insect pests of autumn lettuce are mainly American spotted submarine flies, which can be controlled by spraying 40% Wanling 1300 times.

Lettuce planting method, lettuce planting time harvesting, before the stem is fully hypertrophied, the tender plants can be harvested at any time for the market. When the highest leaf at the top of the lettuce is the right time to harvest the lettuce stem. In order to prolong the market period, the harvest of autumn lettuce can be delayed, and the long spots and flower buds can be pinched by hand on sunny days, or at the beginning of the rosette period, spray 350-500 mequat 2-3 times every 5-7 days.

Lettuce is one of the main vegetables commonly cultivated in Shaanxi, and the main market time for traditional cultivation is spring and autumn, that is, March May, October and November, and there is no lettuce in summer and autumn.

Lettuce prefers a cool climate, and the growing season of lettuce in summer and autumn coincides with the high temperature season. High temperature and long sunshine are easy to cause early lettuce extraction, resulting in lettuce slenderness, poor quality and low yield, which is one of the main factors restricting the development of lettuce in summer and autumn. Therefore, first of all, it is necessary to choose varieties that have strong heat resistance, are not sensitive to sunlight reaction, and are not easy to moss pumping.

<> lettuce can be planted all year round, and the spring is generally planted in February and March, when the survival rate of planting is higher; In summer, planting in June and July is generally hungry, and after planting, you need to use shade nets to protect from the sun; Autumn is generally planted in August-September; In winter, it is generally planted in October and November, and it is advisable to plant in greenhouses.