Abstract: The blooming time is sensitive to the meteorological conditions. By analyzing the observation data of meteorology and phenology of Malus in Changwu county, Shaanxi province, during 1995-2002, the results showed that:(1)the early blooming period started when daily average temperature accessed to 10℃;(2)there was a positive relationship between the early blooming time and the accumulated temperature (≥5℃) from spring, and the maximum coefficient appeared 14 days beforeblooming; (3)there was a significant negative relationship between the early blooming time and 266-277 days before blooming, and the coefficient was relatively stable, so it could be suggested as an approach for forecasting blooming time.

Key words: Malus, Malus, Early blooming period, Accumulated temperature