Countermeasures for early childhood tomato seedlings

Classification of early spring tomato seedling problems:

First, after the sowing, the buds are not sprouted or the buds are not cold, and the tomatoes are generally emerged after soaking seeds and germination. However, sometimes the temperature is lower after sowing, and the nursery is colder. The seeds may not sprout for a while, and they can germinate after the weather improves. The phenomenon of non-germination is mainly long-term low temperature, or the seedlings are too dry when sowing, no water is poured, the water spray is insufficient, and the water is sucked up by the lower dry soil to form a phenomenon of “shelving”. Generally, 7-8 days after sowing, if you do not germinate, you should find the reason for timely remediation.

Second, the freezing damage of tomato seedlings to freezing or freezing is mainly affected by the low temperature below 0 °C, the water between the cell gaps is frozen, the concentration becomes high, and the water is taken into the cells, so that the water in the cell liquid is outflowed, and the cell gap is frozen. The crushed cells are mechanically damaged to cause freezing damage, causing local dryness or death. Precautionary measures: 1. Pay attention to the weather forecast. When the cold air comes, cover the straw in the small arch shed at night to protect the cold and keep warm. During the day, the straw is opened to facilitate the light transmission. 2. Cultivate strong seedlings and smelting seedlings, because the nutrient content of sugar in the cells of the strong seedlings is high, and the concentration is large, which can lower the freezing point. This is the main reason why the strong seedlings are more resistant to freezing damage than the long seedlings.

Third, the flash seedling "flash seedling" is caused by sudden changes in environmental conditions, resulting in wilting and dryness of the leaves. This phenomenon can occur throughout the seedling period, and is most severe before planting. Flash seedlings are related to seedling quality, temperature and air humidity. If the seedlings are not ventilated for a long time in the nursery, the temperature in the nursery is higher, the humidity is higher, the seedlings grow younger, then the air is suddenly ventilated and the outside temperature is low. The air is dry, and the seedlings will wither due to sudden water loss. To avoid "flashing seedlings", we must first cultivate strong seedlings, the seedlings are often ventilated, the leaves are thick and green, and there is generally no "flashing seedling" phenomenon. If the seedlings are wilting, cover the cover immediately, and the wilting can be restored in a short time. This is repeated several times to make the seedlings adapt to the open climate and then remove the cover.

4. Seedlings falling down or dead tomatoes often stumble or die during the nursery process. When the incidence is more than 2-3 pieces of true leaves in the seedlings, the color of the seedling stems in contact with the ground is chlorotic and light, and there is water immersion. After the disease is shrunk and thin, the seedlings will collapse. ,death. Early blight, gray mold and sclerotinia, which cause seedlings to rot and die, are caused by tiger bites. Precautionary measures: 1. Before planting, apply appropriate amount of bactericide such as chlorothalonil or toxic mycelium and Miller or Rosben insecticide to nursery or nutrient soil; 2. Keep the sputum moderately dry, according to nursery Experience, it is generally believed that dry is better than wet. The surface is semi-dry and semi-wet, the air humidity is low, the seedlings are not long, the root system is developed, and the seedlings and the seedlings are generally not killed.

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