1. Analysis of causes of dead seedlings: Mainly due to the failure of seedbed soil and nutrient soil before sowing to be disinfected or disinfected completely, no timely spraying after emergence, and improper management of temperature and humidity of seedbeds, causing damping-off and damping-off. Prevention and control measures: 1 per cubic meter of seedlings with 50% carbendazim 8-10 grams or 1 gram of Greenhenge, mixed with the right amount of dry fine soil spread in the noodles, soaked soil mix well after sowing. When preparing nutritious soil, add 50% carbendazim 80-100 grams or 5 grams of Greenhenge 1 per cubic meter of nutrient soil. Mix well and fill in the nutrient bowl. 2 After 75% of the seedlings are unearthed, spray 50% carbendazim 500 times to sterilize and prevent disease, then spray once every 7-10 days, timely uncover the straw curtain and ventilate and ventilate, prevent the seedbed from being wet and the temperature is too high to induce the disease. 2. Analysis of causes of insecticide dead seedlings: When a large number of underground pests such as cockroaches, cockroaches and cockroaches occur in the seedbed, they cause harm and cause dead seedlings. Preventive measures: Use 80% of dichlorvos EC 1000 times to water the surface of the seedbed to prevent lice; use 80% dichlorvos EC 100 times solution or 50% phoxim 50 times liquid to mix and grind the bean cake, wheat bran, etc. The poison baits can be sprinkled on the soil surface of the seedbed to kill crickets. The use of 50% phoxim EC 1 000 times solution or 48% LS 2 can be used to water the soil surface of the nursery bed, which can effectively control the damaging effect. 3. Analysis of Causes of Killing Seedlings of Drugs: When the seedbed soil is disinfected, the dosage is too large, the bed soil is too dry after sowing, and the spraying concentration after emergence is too high, which can easily result in dead seedlings. Prevention and control measures: The dosage of soil used for bed soil disinfection should not be too large, as described above. After the treatment of the seedbed, it is necessary to maintain a humidity, but the amount of water each time should not be too much to avoid excessive moisture seedbed. Once roots occur, they must be promptly ventilated and drained to promote evaporation. On rainy days, dry fine soil or hay ash can be spread on a seedbed. 4. Analysis of the cause of the dead seedlings caused by fertilizer: The seedling soil is mixed with unrefined organic fertilizer or the inconsistent mixing of fertilizer leads to the burning of dead roots. Prevention and control measures: The use of organic fertilizer on seedbed soil must be fully fermented and decomposed, and evenly mixed with bed soil. When sub-seedling, the soil should be compacted and leveled, and the nutrient should be thoroughly drenched. 5. Analysis of the cause of freezing and dead seedlings: At the time of cold current and low temperature, no cold-proof measures were taken in time, which resulted in freezing and death of seedlings. Or when the seedlings are not properly planted, the soil temperature of the seedbed is too low, and seedlings can not take root and cause dead seedlings after being divided into seedbeds. Prevention and control measures: 1 During the seedling raising period, pay attention to weather changes. In the cold current and low temperature, increase the coverage in a timely manner, and try to keep it dry to prevent it from being wetted by rain and snow and reduce the heat preservation effect. Temporary warming measures may be taken if conditions permit. 2 artificial temperature control seedlings, such as electric hotbed nursery, seedlings. 3 Reasonably increase light, promote photosynthesis and nutrient accumulation, properly control watering, reasonably increase phosphorus, potash fertilizer, etc., improve seedbed soil temperature, ensure seedling temperature requirements, and improve cold resistance. 6. Analysis of the cause of dead seedlings dried: seedlings that have not been ventilated for a long period of time are exposed to a relatively high humidity. When the seedbed is ventilated, direct convection of cold air, or sudden release of air from the membrane, and the cover being blown by strong winds, can all lead to The hot and cold air inside and outside the seedbed has transformed too frequently. The sudden drop in air temperature and humidity causes the tender leaves to lose too much water, causing wilting. If the wilting lasts too long, the leaves will not recover, and it will eventually become green and dry. This phenomenon is called Dry. Prevention and control measures: When ventilating seedbeds, they should be ventilated on the side of sheltered winds. The amount of ventilation should be from small to large, so that the seedlings have a process of adaptation, windy weather, pay attention to the pressure of the cover, and prevent the wind from blowing. 7. Causes of dead seedlings caused by improper seedling raising: When the seedlings are seeded, the seedlings are too often raised, and the seedlings lose water too much at one hour; the seedlings are not easy to recover and die after the seedlings are divided; the seedlings are not well developed before the seedlings, and the roots are less Sub-seedlings are too late, causing rooting, weakening absorptive capacity and dead seedlings. Preventive measures: Do not overshoot the roots when lifting, and bring more soil. Emerge seedlings with a damp cloth to prevent excessive water loss. In the process of raising seedlings, we must pick out the seedlings with few roots, broken leaves, susceptibility and malformations; the seedlings should not be large enough to improve the survival rate. Usually the first time the seedlings are sown, and the eggplant seedlings are in one leaf, the cabbage seedlings are in the three leaf one heart, and the cucumber seedlings are before the cotyledon is unfolded; the seedlings should be selected on sunny days, such as when the light intensity in the greenhouse is high, Put a piece of straw or a shade net on the top of the small shed in the greenhouse to prevent direct sunlight from directly shooting the seedlings that have just finished, resulting in water loss and wilting, and severely causing dead seedlings.
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