AN AGROMETEOROLOGICAL MODEL OF PHYSIOLOGICAL THERMAL INDEX FOR WINTER WHEAT DEVELOPMENT IN EARLY STAGE

Based on full consideration of the winter wheat biological characters,an agrometeorological model of physiological thermal index of winter wheat including vernalization and photoperiod response is established,in which the influence of diurnal variation of temperature,effective temperature and daylength on the development of winter wheat during the period from emergence to elongation are comprehensively considered.Validation of the model using the data taken from the experiments of wheat ecology in China shows that the model behaves well with mean error less than 3 days.