When will the lettuce be sown? What are the main points of planting methods in greenhouse?

Lettuce is one of our common vegetables, there are many ways to eat, stir-fried, hot pot ingredients, hamburger vegetables are good choices. As a green vegetable, lettuce has rich nutritional value, tastes crisp and is loved by many people. In addition, there are some people use lettuce to plant potted vegetables, which means a good meaning indoors, which is synonymous with "making money". Let's find out when to sow lettuce today. What are the planting methods?

When will the lettuce be sown?

The sowing time of lettuce is determined according to its growth habits. Because lettuce is not resistant to cold and heat, it is mainly divided into regions to determine the planting time:

1. In the middle and lower reaches of the Yangtze River, the spring sowing time is from late January to mid-late February, planted in March and harvested in May, and the autumn sowing time is generally concentrated from August to September and from November to December.

2. South China: lettuce is generally sown in two periods, one is summer, the other is from September to February, and the harvest time is from November to April.

3. The northwest and northeast alpine regions: sowing in spring and harvesting in summer.

However, the planting technology of lettuce has been improved in recent years, such as lettuce planting in greenhouse, hydroponic lettuce and so on. Generally speaking, selecting suitable varieties and doing good maintenance measures can sow seeds all the year round and supply them on the market all the year round. It is a vegetable with high economic value.

2. Key points of planting methods of lettuce in greenhouse

1. Select varieties of lettuce

Generally, if the greenhouse planting method is adopted, it is necessary to choose lettuce varieties with strong cold tolerance, strong adaptability and strong disease resistance, so as to ensure the output of lettuce.

2. Land preparation should be leveled.

Lettuce seeds are very demanding for the seedbed, because the lettuce seeds are very small, so not only the soil preparation should be fine, but also the bed soil should be flat. After the completion of soil preparation, a certain amount of farm manure should be mixed evenly in the soil to lay a good foundation for subsequent growth.

3. Lettuce seed treatment and sowing

(1) seed treatment: the bought lettuce seeds can be treated in two ways, one is soaking seeds to accelerate germination, and the other is directly sowing with dry seeds.

If soaking seeds to promote germination, generally wash the seeds with warm water, then drain and install them in a basin, place them in an environment of 20 ℃ at room temperature, wash and dry every day, and generally sprout in 3 days.

Dry seed sowing needs to mix the medicine in advance, and then sow, not overnight.

(2) sowing: first water the seedbed and wait until the water is fully permeated before sowing. Keep in mind that the planting density should not be too high, which will affect the growth of lettuce seedlings.

4. The environment should be moist during the emergence period of lettuce.

Lettuce must grow healthily in a moist environment if it is to grow well. If the temperature is very high and the light is too strong, it is necessary to shade and cool down at the right time.

5. Fertilizer and water management of lettuce

(1) watering

After planting, lettuce must be watered thoroughly and should not be allowed to be in a dry environment. Generally, the amount of water and times of watering should be determined according to the specific growth of lettuce. Generally speaking, it is watered once a week. The temperature is not high in spring and the water evaporates slowly, so the watering times and amount of water should be reduced appropriately. High temperature in summer, less watering when there is more precipitation, watering when there is less precipitation, especially during the growth period, it is necessary to keep the soil moist at all times.

(2) fertilization

Because sufficient base fertilizer has been given during the sowing period, if lettuce grows well and there is no lack of fertilizer, there is no need for extra topdressing. But if the growth is slow, the leaf color is light, must be appropriate topdressing, nitrogen, phosphorus and potassium fertilizer is to promote leaf growth fertilizer, about once every half a month or so.

(3) weeding by ploughing

Why do we say that lettuce should be weeded after planting? In order to promote the development of roots, weeding can loosen the soil, make it more nutritious and grow healthier in the later stage.

6. Control diseases and insect pests of lettuce

The main diseases of lettuce are soft rot, downy mildew, etc., and the common pests are aphids, ground tigers and so on. Generally speaking, it is not necessary to strengthen the prevention of these diseases and insect pests. If it happens, it should be solved actively, so as not to infect the healthy plants. Of course, in general, we do not recommend the use of pesticides, if it is really out of control, we must use the drugs reasonably and spray them one month before harvest as far as possible.

To sum up, the common sowing time of lettuce is spring sowing and autumn sowing, harvest should also be paid attention to, early rather than late, I hope the majority of vegetable farmers pay attention.

Time: 2019-03-13 Click: