During the process of transplanting vegetables, it is generally necessary to conduct 1-2 sub-seedlings (transfer seedlings) to constantly expand the area of ​​nutrition and promote the development of the root system so as to prevent leggy and cultivate strong seedlings.
First, the cause of dead seedlings (a) seedbed soil temperature is too low. Because the soil temperature of the seedbed is too low, after the seedlings are planted on the seedbeds, they do not take root to grow and die. The reasons for the low soil temperature are as follows: Some beds are late, and the bed is sub-seedling, and the soil temperature is not raised; some watering is excessive when the seedlings are divided, some glass or membrane leakage of the seedbeds, rainwater leakage after sub-seedling Into the bed, lower soil temperature, is not conducive to seedlings take root, can not be timely seedlings. (b) Damage to rhizomes by seedlings. Some seedlings before sub-seedling, not many roots, poor development, it is difficult to slow seedlings after seedlings; some seedlings, although well-grown, but the seedlings, hand-seedlings during transplanting seedlings too tight and hurt young Stems destroyed the transmitting tissues and died after they were sucked on the seedlings. (3) The seedlings lose too much water. When the seedlings are raised too often, they will not be planted for a short period of time. As a result, the seedlings lose too much water and wilt. After the seedlings are divided, they will not be able to recover even though they are pouring enough water. (d) late seedlings. Some vegetables, such as cucumbers, are too late. The seedlings grow very large, and it is difficult to survive without clods. (e) Fertilizer burned. Some sub-bed soil, mixed with some unfamiliar farmyard fertilizers, causing burning roots and dead seedlings; some bed soil due to adding too much fertilizer and burning seedlings.
Second, prevention (a) before sub-seedling refining seedlings. The hardening seedlings can shorten the time for the seedlings to slow seedlings, which is conducive to the survival of seedlings. The method is to allow the seedlings to fully receive the light before raising the seedlings, gradually reduce the temperature, increase the temperature management, and gradually increase ventilation, try not to water during the hardening period. (b) It is not appropriate to divide the seedlings into small ones. The first time the seedlings were sown, the eggplant seedlings were at the 2 leaf 1 heart stage, and the cabbage and cauliflower were at the 3 leaf 1 heart stage. Cucumber is generally not divided into seedlings, but is stuck in a nutrient bud until it is planted. (c) Raise soil temperature in seedbeds. The higher temperature required for seedlings after seedlings can be ensured. For example, the soil temperature of broccoli seedlings should not be lower than 16°C, and cabbage should not be lower than 8°C. (d) improve the quality of seedlings. Bed soil should be slightly compacted when seedlings are divided. Leveling, then open the ditch, put the seedlings, water, after the water infiltration, cover the ditch, in the operation, should gently hold the seedlings gently to avoid damage to the tender stems. When you raise the seedlings, you should not hurt the roots too much. You should dig up the seedlings with a spade shovel. Follow the points and raise the seedlings. Do not get up too much at once. In the process of lifting and transporting seedlings, use a damp cloth to prevent excessive water loss from seedlings. Seedlings are selected in conjunction with seedlings, and young, broken, diseased, and deformed seedlings are discarded. (e) Shade after seedlings. When the seedlings are divided, they should be selected for sunny days. After the seedlings are divided, they should be placed in greenhouses or greenhouses. When the light is strong and the temperature is high, a piece of haystack is shaded every three to five to prevent direct sunlight from reaching the seedlings that have just finished.
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