Sub-seedlings of vegetables are used to prevent the seedlings from squeezing seedlings, expand the nutrition and light area of ​​seedlings, and promote the growth of seedlings. However, when the vegetables are divided into seedlings, they will inevitably cause root-cutting in different degrees, so that the root function will decline and the normal growth of seedlings will be inhibited. To ensure that the seedlings restore as much as possible the root absorption function and the healthy growth of the seedlings, detailed management of the seedlings is very important. Sub-seedling should be divided once. Split seedlings start from 2 true leaves and are controlled within 3-4 true leaves. Because the seedlings are small, the root system is less damaged, and the seedlings are quicker; if the seedlings are too old, it will affect the flower bud differentiation. 3-5 days before seedling separation, the seedbed should pay attention to cooling, increase ventilation, control watering, and exercise seedlings. Sub-seedling before pouring water again, when the seedlings dig seedlings while digging a small arch shed to prevent seedlings wilt. To set the seedling density early. Because the seedling density is closely related to the previous production. Within a certain range, with the increase of the seedling distance, the stems of the seedlings become thicker, which is conducive to the formation of strong seedlings, and the yield in the early period after planting is relatively increased. If the plant spacing after seedlings is too small, the seedlings will be crowded, and the thin stems and stems will tend to be weak, resulting in leggy, which is not conducive to the increase of the previous period yield. After splitting the seedlings, the 8-10 cm spacing is the appropriate density. If nutrition is used, the earth should be filled with earthworms to improve the moisturizing and heat preservation effects and cultivate strong seedlings. Immediately after the seedlings are dug up, the seedlings must be rowed, and in particular, the roots must be sun dried or blown away by the wind. When the seedlings are divided, it is best to separate the seedlings from the seedlings, remove diseased seedlings, insect-injured seedlings, and headless seedlings. Divided seedlings should be shallow row, generally cotyledon exposed 1-2 cm above the ground is appropriate, row seedlings should be tightly rooted soil, and timely pouring enough water. The seedlings excavated on the day were lined up. If you can't finish in the morning, you can concentrate on soil, spray water and cover it with a cover to prevent dehydration and wilting, and finish it in the afternoon. If seedlings grown in nursery factories are used, seedlings should preferably be treated after the seedlings arrive. Because nursery factories use high-density plugs (108 or 72 points) for seedlings, the growth of seedlings is restricted by plugs, and 3-5 leaf periods require seedlings or planting or else they will affect seedling growth. The seedlings can be transplanted into 1010 cm nutrient bowls to expand their growth and nutrition. Jiangsu Health Medical Technology Development Co., Ltd. , https://www.medicalhos.com