The soil temperature of treatments 1 to 5 from March to June each year is lower than that of the control, so the flowering period of apples is postponed and the impact of "falling spring cold" on apples is avoided.
Each year from March to June to deal with 1 to 5 soil temperature is lower than the control, so delayed the flowering of apples, to avoid the "reverse spring cold" on the impact of apples.
The soil temperature of treatment 1-5 from March to June every year was lower than that of control, so the flowering period of Apple was delayed and the effect of "late spring cold" on Apple was avoided.