In loess hilly and gully region

the young apple tree living rate and living mass which is planted with leaves in the early autumn in order to take the advantage of the soil moisture and is covered with soil in the winter

are high 32.3%、38.34% and 22.22%、54.16% than which is planted in the late autumn and the early spring.The tree is pla nted after leaves falled

and the earth near the root is covered with plastic film

the trunk is twisted with plastic film or the trunk is cased with stem of the sun flower has high living rate and living mass

but its cost is hig h and difficult to spread.