Abstract:  The correlation relationship between accumulated temperature during whole growth period and in different growth stages, the temperature factors that included accumulated days of specific temperature index and maturing time in north of Henan province last 10 years (2000-2009) was analyzed, the results showed that accumulated days(AD15) of the maximum daily temperature≥15℃ and accumulated days(HD20) of the maximum daily temperature〖JP3〗≥20℃ during November to April(next year)were significantly correlated with the days of whole growth period(P<0.01). 〖JP〗Each maturing time was simulated by using the equation of accumulated days of average temperature≥15℃,the results were highly consistent with the actual maturity, which indicated that the  AD15 and  HD20 during November the year to April next year were the key meteorological factors that influence wheat growth and development.  AD15 of average temperature≥15℃ could be used to predict wheat mature time and harvest time effectively.

Key words: Wheat, Prediction of maturity time, Accumulated days of average temperature≥15℃, Accumulated days of max temperature≥20℃