Key points of cultivation techniques of late Tomato in Autumn in greenhouse

Tomato is a kind of food with high nutritional value, which can be eaten raw or cooked, and has a special taste. Generally, tomatoes are planted in spring, but in order to be able to eat tomatoes in other seasons, they will choose autumn in the greenhouse. Next, let's take a look at the key points of the cultivation techniques of autumn tomato in the greenhouse.

1. The selection of the right variety is the key

Varieties with strong disease resistance, early maturity, high yield and storage resistance should be selected. At present, the commonly used varieties in production are: Tropec, Froude, Jiafan No.1, Jiahong, Qiangfeng, Shenfen No.1. L401, Zhengfan 2, Tinghong 2, etc., should be specifically selected in the light of local characteristics.

2. Determine the appropriate sowing time and seedling raising method.

If the autumn tomato in the greenhouse is sown too early, the seedling stage is in the high temperature and rainy season, the incidence of virus disease is high, the sowing is too late, the growth period is insufficient, and the fruit of the third ear at the top can not become hot. The suitable sowing time should be moved forward about 110days when the local temperature reaches about minus 5 ℃. Jilin, Liaoning Province, should be in the middle and last ten days of June. If only two ears of fruit are left per plant, the suitable sowing date can be delayed by 4m / m for 5 days.

Tomato cultivation in greenhouse can be either direct seeding or seedling transplanting. Direct seeding cultivation, root system is not damaged, plant growth is robust, per unit yield is higher, but in the early stage ploughing loose soil and spraying pest control is more laborious. The transplanting of autumn tomato in greenhouse can be done either by transplanting small seedlings (transplanting mother seedlings) or by raising large seedlings. Seedling transplanting is generally in the two-leaf heart, the seedling will be planted in the greenhouse, the seedling age is 15-18 days, when the secondary lateral root of the plant has just extended, the root width is small, the root injury is less, easy to slow the seedling. The seedlings should be planted and watered in time, otherwise the soil is easy to harden and the seedlings get stuck. Transplanting large seedlings is a widely used form in production at present. When raising seedlings, the seedlings were transferred at one time in 2-3 leaves, and the seedlings grew to 5-6 leaves. When the seedling age was about 25 days, the seedlings were planted in cutting blocks or without nutrition bags. The advantage of this method is that it is convenient for centralized management at seedling stage, planting late, and is beneficial to crop rotation, but the disease of late planting is more serious. In actual production, direct seeding or small seedling transplanting of autumn tomato in greenhouse is often more beneficial to high and stable yield than transplanting large seedlings. Summer tomato seedlings can be raised by shading net in order to reduce diseases and cultivate strong seedlings.

3. Land preparation and planting

Clean the fields and fertilize the land before planting. Generally, about 5000 kilograms of rotten farm manure is applied per mu. Autumn tomatoes can be cultivated by border planting or ridging. The planting density is generally higher than that in spring. The cultivation of limited growth varieties or only the ear and fruit left per plant is cultivated, and about 5000 plants are planted per mu. Infinitely growing varieties were cultivated with 3 ears per plant and about 4000 plants per mu. It is best to choose cloudy days or evening planting, and timely watering, in order to ease the seedlings.

4. Management after planting

Ventilation and cooling should be strengthened after planting. Ploughing and loosening the soil in time. If the plant is overgrown, it should be sprayed in time. In florescence, spray or dip in fruit-setting hormones such as anti-falling hormone, pruning, branching and vine binding in time, generally using single-stem pruning, leaving 2-3 ear fruit to pick the heart. After the middle of September, the external temperature began to drop, so we should pay attention to the heat preservation at night, and strengthen the management of water and fertilizer when the first ear fruit seat is occupied.

5. Pest control

The virus disease of autumn tomato in greenhouse is serious in the early stage, and the diseases such as leaf mold, early blight and late blight in the later stage are more serious, so it is necessary to strengthen the control of aphids, whitefly, cotton bollworm and so on.

6. Harvest

Autumn tomato fruits in greenhouse should be harvested and put on the market one after another after changing color. When the temperature in the greenhouse drops to 2 ℃, all of them should be harvested and stored.