First, the planting of large seedlings is not conducive to the differentiation of flower buds in the middle and late stages of vegetables. The flower bud differentiation of most vegetables begins when 2 to 3 true leaves are unfolded, and by the branching period (6 to 7 true leaves), the flower bud differentiation has reached the stage of "starry sky", which determines the yield and quality of vegetables Critical period. If it is not planted at this stage, the plant is 25-30 cm high, and the seedlings on the seedbed are crowded, shading each other, affecting the progress of photosynthesis, which tends to cause the seedlings to grow long, which will inevitably affect the differentiation of flower buds in the middle and late stages, resulting in the production of vegetables Greatly reduced.
The second is slow planting of large seedlings and serious root diseases. The planting of large seedlings reduces the photosynthesis of plants, produces less photosynthetic products, and the root system grows too slowly without sufficient nutrients. The root system grows too slowly, and absorbs less water and nutrients from the soil, which is not enough to supply the growth and development needs of the above-ground stems, leaves, and flowers, so the seedling delay time is long.
Thirdly, due to the inadequate vegetative growth of the seedlings, the growth of the root system is weak, resulting in weak disease resistance of the plant, and some soil-borne diseases will take the opportunity to infect and cause the vegetable to die. After planting 4 to 6 leaf seedlings, they can quickly adapt to the soil environment and take root, which is conducive to slow seedlings and has enough space for nutrient growth, which can make the plant robust.
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