Determining the appropriate sowing date should be based on the characteristics of tree species and the natural conditions of the nursery to determine the appropriate sowing date for each tree species. Spring sowing is generally conducted in March-March. The first sowing method is reasonable sowing. It is suitable for large seeds such as Camellia oleifera, walnuts, chestnuts, tung oil, etc. In the case of relatively loose seedbed soil, the seed can be placed horizontally in a certain row spacing. If the soil is tight or if the seeds have germinated and broken, it is advisable to open the seeding ditch first and then sow the seed in the ditch. The second is the drill. Seedlings such as pine and fir are generally drilled. Drilling can save seeds, neat and consistent germination, and management is also more convenient. According to the need to press a certain line spacing, open seeding ditch planting in the seedbed. The seeding ditch must be straight and consistent in depth, otherwise it will not germinate because of different shades of soil. The seeding ditch is generally 3-5 cm, and for those conifers that grow slowly, wide seeding can be used to widen the seeding ditch to 10-15 cm. The third is sowing. It is mainly used for small seeds and tree species that cannot be transplanted in the past. Choose fine weather without wind and spread the seeds evenly on the seedbed. Due to the large amount of seeding and the emergence of seedlings, although the yield of seedlings can be large, the quality of seedlings is poor, and weeding is also laborious. It should not be used in nursery land where there is more soil and weeds. Doing a good job of covering the earth with the exception of poplar, paulownia and other very small seeds, after sowing are generally covered with soil cover species. Small seeds should be covered with thin soil, otherwise it is difficult to germinate; large-grained seeds should be thicker. After planting cover soil, straw, wheat straw, etc. are applied on the seedbed to cover it, and the thickness is generally 3-5 cm, which can prevent seedbed drying, compaction, and rain erosion, resist cold invasion in early spring and birds and beasts, prevent weeds from growing, and prevent seedlings from growing. Neat and consistent, there are conditions in the seedbed can also be covered with a layer of film, compacted around the buried, water retention effect is good, neat emergence, growth is good, when the seedlings on the membrane along the top of the seeding row draw a seam, so that the seedlings exposed.
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