First, colonization of large seedlings is not conducive to flower bud differentiation in late-middle vegetables. The flower bud differentiation of most vegetables started from when 2 or 3 true leaves were unfolded. By the time of delivery (6 to 7 true leaves), the flower bud differentiation has reached the “starry sky” stage, which determines the yield and quality of vegetables. The key period. If the plants are not planted at this stage, the plants are 25 to 30 cm high. The seedlings on the seedlings are more crowded and shady each other, affecting the photosynthesis, and tends to cause leggy seedlings, which will inevitably affect the flower bud differentiation in the middle and later stages, resulting in late middle and late vegetable yields. Greatly reduced.

The second is that large seedlings are slow to plant seedlings and the roots are seriously ill. Large seedling colonization, plant photosynthesis decreased, the production of photosynthetic products is less, the root system is not adequate nutrition and growth is too slow. Roots grow too slowly and absorb less water and nutrients from the soil, which is not enough to supply the growth and development needs of shoots, leaves, and flowers on the shoots, thus slowing down the seedlings for a long time. At the same time, because of weak root growth and weak resistance to disease, some soil-borne diseases will spread out and cause vegetables to die. The 4 to 6 leaves of the seedlings after planting, can quickly adapt to the soil environment and take root, which is conducive to slow seedlings. In this regard, to remind farmers friends: when planting vegetables must choose to plant seedlings.

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