The winter is cold and the spring breeze is large. People are accustomed to planting trees in the spring. However, in the autumn, digging tree pits in spring can change the original physical and chemical properties of the soil and mature. The tree pits will also be full of snow in the winter, with ammonia, hydrogen sulfide and other gases and active substances that can promote crop growth. After the snow melts, these substances infiltrate the tree pit soil with the snow water, which not only fosters fertility, but also promotes the growth and germination of the seedlings. • The specifications of tree pits should be based on different soil quality, different tree species, and seedling size. The general principle is that it should not be too small and should not be too shallow, so that the roots of the seedlings can be stretched out in the pits, and there are sufficient gaps between the root end and the pit wall. If you encounter a hard, water-impervious soil beneath the soil, you should dig it through. Digging tree pits in the fall, the topsoil and the soil should not be placed on both sides, but should be placed on the side of the tree pits for ventilation. This will help store more snow in the winter. After the tree pit has been dug up, put a few patties of compost on the bottom of the pit, cover a thin layer of soil, and wait for the spring planting.
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