lnquirement to adjusting and controlling index of flowering period of the comlnon calla

The investigation on the flowering speed of the common calla and the observation of its environmental temperature and rdative humidity in the same period and at the same altiude indicate that，by using regression analysis method，the flowering days have a linear relation with the accumulated temperature and the length of the flower stem is a log relation to the effective accumulated temperature．Among the flowering altitude，sale altitude and the accumulated temperature，there are good relations．The flowering period can be controlled by adjusting the environmental temperature．