The latest course of planting techniques and methods of winter lettuce in greenhouse

Lettuce is a common vegetable in our daily life, and it has a wide planting area in our country. Now, as the planting technology becomes more and more mature, it is possible to grow lettuce in the greenhouse all the year round. Now, as the temperature gradually drops, how to grow greenhouse lettuce in winter? The following editor brings you the planting technology of winter lettuce in the greenhouse, let's have a look!

1. Garden site selection

The root capacity of lettuce is relatively weak, so the nutrient absorption capacity will not be very strong. Lettuce is not suitable to grow in a high humidity environment, if it is in a high humidity environment for a long time, then it is prone to downy mildew, Sclerotinia sclerotiorum and so on, which will have a great impact on the growth of lettuce. In addition, the oxygen requirement of lettuce in the growth is relatively high. Therefore, the garden of winter lettuce should be built on the soil with high topography, normal drainage and irrigation and rich humus content, preferably sandy loam, and ensure that the soil has strong water and fertilizer conservation.

2. Variety selection

The variety selection of winter lettuce is very important, mainly middle and late maturing varieties, if it is early maturing varieties, then it is easy to appear early bolting phenomenon. Therefore, Sanqingpi, Jinming No.1 and other varieties should be selected, among which Sanqingpi varieties generally take about three months to harvest after sowing. Jinming No. 1 is a new variety in recent years, which has strong resistance to Sclerotinia sclerotiorum and its maturity is generally about three months. The suitable variety directly determines whether lettuce can survive the winter safely, and it is also the key to the success of planting.

3. Sowing seeds at the right time

The planting time of winter lettuce is generally around September, and the average daily temperature should not be higher than 23 degrees. We should do a good job of handling the seeds before sowing. First wrap the seeds in gauze, then soak them in clean water for about 5 hours. Then remove the seeds and put them in the freezer to germinate for about two days. After sowing, the temperature should be controlled at about 18 degrees, pay attention to control the sowing density, and the seed consumption per mu is about 15kg. Sowing seedbeds should be based on fertile vegetable gardens, apply sufficient base fertilizer, then turn the soil deeply, and then sow seeds after watering and covering the soil.

4. Seedling stage management

After sowing, there is no need to cover the soil, just gently pull the topsoil. Then cover the sunshade net for about three days, do a good job of shading, and keep the temperature of the seedling bed at about 22 degrees. When the seedling cotyledons are enlarged, they can come into contact with the sunshade net. After emergence, the temperature during the day is controlled at about 20 degrees, and the temperature difference between day and night is maintained at 10 degrees. And it is necessary to properly spray chlorothalonil and other chemicals to do a good job in the prevention and control of diseases and insect pests of seedlings. Seedlings generally do not need topdressing, to maintain the light leaf color of seedlings, is conducive to slow seedlings after transplanting, but we should pay attention to weeding work to avoid weeds affecting the growth of seedlings.

The above is a brief introduction to the planting technology of winter lettuce in greenhouse. That's all for today's introduction. This article is for reference only. I hope it can help you all.