Comparison of two air temperature based models for predicting phenophase occurrence in Persian lilacs (Syringa chinensis) cultivar Red Rothomagensis

摘要

Phenological data collected for 9ndash;11 years from genetically uniform Persian lilacs (Syringa chinensisL.) cultivar Red Rothomagensis were analyzed to determine whether the number of days elapsed between vegetative bud break and flower bud break is correlated with either the accumulated growing degree-days or the average daily temperature. The lack of statistically significant correlations between these variables suggests these mathematical models cannot accurately predict the onset of flower bud break for this cultivar.Key words: degree-days, growth model, phenology.