The main points of the latest course on techniques and methods of lettuce cultivation in open field

Lettuce is a kind of vegetable that everyone likes very much, especially now hot pot and barbecue are becoming more and more popular, and the demand for lettuce is also increasing. So now there are still a lot of people growing lettuce, and the planting method of lettuce is generally cultivated in the open field, so how to cultivate lettuce in the open field? Today, the editor brings you the key points of lettuce cultivation techniques in the open field. Let's take a look at it together.

1. Prepare before sowing

Before sowing lettuce, we first need to choose the seeds of lettuce. Lettuce is divided into heading lettuce and loose leaf lettuce. When we plant, we need to choose the planting varieties according to the market demand and the local climate. After selecting the planting varieties, we should pay attention to the preparation of the seedbed. When raising seedlings for lettuce, we should focus on water conservation, fertility and fertile soil. If there are conditions, then we can still self-control. Use organic fertilizer, ammonium sulfate and other fertilizers for configuration, then fully mix and then smooth and rake fine, pour into sufficient bottom water, and then sow seeds after underwater infiltration.

2. Sowing and raising seedlings

When sowing, we should mix an appropriate amount of fine sandy soil into the seeds, mainly in order to ensure uniform sowing. After sowing, we should also pay attention to covering a layer of fine soil. Then cover a layer of plastic film to improve the moisturizing capacity of the soil. The sowing rate per mu should be kept at about 40g. When the seedlings are unearthed, the plastic film on the seedling bed should be opened in time to avoid excessive growth of the seedlings. The temperature of the seedbed should be kept at about 20 degrees during the day and 12 degrees at night. At the same time, we should also do a good job of ventilation and ventilation, and if we encounter strong light, we should pay attention to shading.

3. Rational fertilization

The growth of lettuce requires a lot of soil. It is necessary to ensure that it is not only rich in organic matter, but also the ability of soil to retain water and fertilizer. Lettuce generally likes to grow on slightly sour soil, so the pH of the soil should be kept at about 6. In general, the demand ratio of nitrogen, phosphorus and potassium for each 1000kg production of lettuce is about 2.5kg 1.2mol 4.5kg. If it is heading lettuce, then the demand will be even greater. In its growing period, we should pay attention to rational coordination of nitrogen, phosphorus, potassium and other fertilizers. Before planting, we should apply sufficient base fertilizer, mainly mature farm manure, turn the soil deeply and pour sufficient bottom water after fertilization.

4. Planting management

The day before lettuce planting, pay attention to watering the seedling bed to ensure that the soil is moist. Then, when the seedlings are raised the next day, they should mainly transplant with soil to avoid root injury. When planting, we should first open a ditch on the border surface, keep the ditch depth at about 5 cm, and then apply an appropriate amount of compound fertilizer before watering. During the whole growth period of lettuce, the demand for water is still relatively large. Therefore, about a week after planting, it is necessary to water slow seedlings and carry out about two times of mid-ploughing and weeding. Then water it for about three times, and apply nitrogen and phosphorus fertilizer in stages during watering.

The above is a brief introduction to the main techniques of lettuce cultivation in the open field. That's all for today's introduction. This article is for reference only. I hope it can help you all.