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Early spring tomato breeding problems have countermeasures early spring tomato breeding problems have Countermeasures Category: Please select the scope of application: not limited one, after sowing buds or sprouting tomatoes is more cold-resistant, usually by soaking seed germination can emerge. But sometimes the temperature after sowing is low, and the seedlings inside are colder. The seeds may not bud for a while, and they can germinate after the weather improves. The phenomenon of non-germination is mainly long-term low temperature, or when the seedlings are sown, they are too dry, and they are not irrigated. The water spray is insufficient, and the water is sucked off by the lower dry soil to form a phenomenon of “dryingâ€. No germination should be found after 7 to 8 days after sowing. Second, freeze-damaged tomato seedlings freeze-frozen or frozen, mainly affected by the low temperature below 0 °C, intercellular gaps between water freeze, the concentration becomes higher, and grab water inside the cell, so that intracellular fluid outflow of water, while the cell gap jelly , Squeeze the cells by mechanical damage and produce freezing injury, causing local dryness or death. Preventive measures: 1, pay attention to the weather forecast, when the cold air comes, cover the straw cold insulation in the small shed at night, and uncover the rice straw during the day to facilitate light warming. 2, nurturing strong seedlings and hardening seedlings, because of strong seedlings cell liquid nutrient content, such as high concentration of sugar, the concentration of large, can reduce the freezing point, this is the strong seedlings than leggy seedlings can be the main reason for the better resistance to freezing injury. Third, flash seedlings "flash seedlings" are caused by sudden changes in environmental conditions caused by leaf blight, dry phenomenon. 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 period of time in the seedling shoots, the temperature inside the seedling shoots is high, the humidity is high, and the seedlings grow young. At this time, the air is suddenly ventilated and the outside temperature is low. ,Air drying, seedlings will wither due to a sudden loss of water. To avoid “flash seedlingsâ€, we must first cultivate strong seedlings. The seedlings are often ventilated, and the leaves are thick and dark green. Generally, “flash seedlings†do not appear. If the seedlings are withered, they must be covered immediately and withered in a short time, so that the seedlings are repeatedly exposed several times to adapt the exposed climate and the cover is removed again. 4. Tripling or Death of Seedlings Tomatoes frequently experience tripping or death during nursery. The incidence of more than 2-3 true leaves in the seedlings, the seedling stem and the ground contact with the color pale green, light flooding, after the disease contraction became thin linear, after the sun, the seedlings will collapse ,death. The early plague, gray mold, and sclerotia caused by rot and death of seedlings are the hazards of the ground tiger. Preventive measures: 1. Before sowing, apply an appropriate amount of fungicide such as chlorothalonil or Rhizoctoniae to the seedling or nutrient soil with Milur or Lethbone pesticides; 2. Maintain moderate dryness within the seedlings, according to the nursery. Experience suggests that dry is better than wet. The semi-dry, semi-dry surface, low air humidity, seedlings are not long and the roots are well developed. Generally, they will not die or fall.