Detailed Explanation of Key Technical Points for Vegetable Seedling Cultivation

First, low-temperature hardening must be strengthened. In particular, lower night temperatures should be controlled, and a certain day-night temperature difference should be maintained. 7 to 10 days before transplanting, the seedlings should undergo even stronger low-temperature hardening, with temperature and water controlled, to improve the seedlings' ability to adapt to low temperatures.

Second, the seedlings' light exposure time should be increased and light intensity raised, to enhance the seedlings' photosynthesis. The inner coverings such as straw curtains and shade nets can be appropriately opened, the outer coverings such as plastic film and glass should be kept clean, and a photosynthetic nutrient film fertilizer can be sprayed, which helps plants absorb large amounts of light fertilizer, light energy, and light, is compatible with conventional fertilizers and nutrients, and supplies plant growth and development to the limit. One application benefits the whole year.

Finally, the humidity of the seedbed must be controlled. When humidity in the seedbed is high, the seedlings' internal water content is high, the cell sap concentration drops, and the seedlings are prone to freezing damage. Ventilation should be strengthened to reduce seedbed humidity. When the bed soil is too wet, a layer of dry fine soil or plant ash can be spread to absorb moisture, about 0.5 cm thick; when spreading dry fine soil or plant ash, do not let it touch the leaf surfaces or the seedlings' growing points, and do it when the seedling leaves are dry.