Seedling raising method for improving quality of dwarf self-rooted rootstock apple seedlings in high altitude area

The invention discloses a seedling raising method for improving the quality of dwarf self-rooted rootstock apple seedlings in high-altitude areas, which comprises the following steps: before winter, preparing nursery land in advance, planning planting rows, and preventing the planting rows from freezing and hardening in winter. In January, prepared dwarf self-rooted rootstocks and scions are grafted indoors, nursery stock planting is conducted according to designed planting rows at the beginning of February, arched shed treatment is conducted, it is ensured that nursery stocks are not damaged by freezing, and nursery stock breeding at the lower altitude is advanced by about 45 days. When the external daytime air temperature reaches 15 DEG C or above and the night air temperature reaches 5 DEG C or above, the arched shed is removed, then seedling growth is promoted in the mode that water flush fertilizer is additionally applied every month, the height of the seedlings generally reaches about 1.5 m before and a