When will the autumn bamboo shoots be planted? If you master these six technologies, you can have a high yield!

Lettuce is a common vegetable in China, which is deeply loved by people because of its simple cultivation, low investment cost and friendly price. Almost every household has planted lettuce. When will autumn lettuce be planted? How to grow high yield?

When will the autumn lettuce be ready?

Autumn lettuce is generally planted from September to October, but the specific planting time needs to be determined according to the local climatic conditions, variety characteristics, facility conditions and annual planting stubble arrangement. The lettuce planted in this way can survive the winter safely after 40-50 days when the seedlings have 5-6 true leaves, and there is sufficient time to grow leaves after turning green in the next spring, and high yield can be obtained after harvest from April to May.

Second, how to grow high yield of autumn lettuce?

1. Variety selection

When lettuce was exposed to high temperature and long sunshine of more than 22 ℃ and long sunshine, the flower bud differentiated rapidly, while autumn lettuce was often under this condition of bolting at seedling stage, so the middle and late maturing varieties with slow response to high temperature and long sunshine must be selected. Generally, the pointed-leaf bamboo shoots mature later and are more heat-resistant at the seedling stage.

2. Determine the sowing date

Autumn lettuce takes about 3 months from sowing to harvest, and the suitable temperature period for stem and leaf growth of autumn lettuce is about 60 days after the ten-day average temperature drops to about 21 ℃, so it is safer to arrange the seedling stage in the first month when the ten-day average temperature drops to 21: 22 ℃. Although the sowing date is too late, it can avoid immature bolting, but it is easy to suffer frost injury in the later stage because of its short growing period and low yield. Generally, it is more appropriate to sow seeds from late July to early August.

3. Low temperature treatment of seeds

The optimum temperature for lettuce seed germination is 15 ~ 20 ℃. The orchard temperature is high and it is difficult for lettuce seeds to germinate in summer, so low temperature treatment is needed before sowing. The methods are as follows: ⑴ soaked in cold water for 5 hours for 6 hours, took out and filtered out water, and put it into light at 15: 16 ℃ to accelerate budding. After 2 to 3 days, 60% of the buds can be sowed. ⑵ was frozen in the refrigerator of 0: 4 ℃ for 4 hours and budding was observed at the temperature of 15: 16 ℃. ⑶ put the soaked seeds into a cloth bag, hung them on the surface of the deep well, and sowed them after 2-3 days of budding. (4) or choose seed coating agent to seed Baoyi, you can choose wilting rust Ling. Fumishuang, or chlorpromazil coating and mixing seeds.

4. Seedling stage management

Seeds can be sowed in nutrition bowls or seedling beds. After sowing, elevated shading or hanging shading nets should be set up. Seedlings should not be too dense to prevent overgrowth.

5. Planting and management

It is appropriate to choose the land with fertile topsoil and strong water retention, which is to apply sufficient base fertilizer before planting. Transplanting with soil in the afternoon, the seedling age is about 25 days, the longest is not more than 30 days, strict selection of seedlings, elimination of growing seedlings, density of 20-26 cm square is appropriate, after planting, watering root water, and watering once in drought to ensure survival, in order to prevent immature bolting, fertilizer and water supply should be adequate, especially nitrogen fertilizer, in order to accelerate leaf occurrence and leaf area expansion. Generally, quick-acting nitrogen fertilizer is applied after slow seedling, rosette stage and stem expansion, and proper amount of potassium fertilizer is added for the last time, which can promote stem hypertrophy. In a word, lack of water and fertilizer is one of the important reasons for bolting of autumn lettuce, which must be paid full attention to.

6. Rational use of growth regulators

Plant growth regulators were used to inhibit immature bolting. Spraying 500 mg / kg penicillin or 6000 mg / kg penicillin on lettuce can effectively restrain bolting and increase stem weight, but it should not be used in seedling stage.

The above is the planting time and method of autumn lettuce. I hope it will be helpful to everyone!