桃品种需冷量评价模式的探讨

 通过1986～2001年对450余份桃品种需冷量的7．2℃模式、0～7．2℃模式(不包括0℃)和犹它模式比较分析，归纳出桃品种需冷量的评价模式为：以秋季日平均温度稳定低于7．2~C的日期为需冷量测定的起点，以0～7．2℃累积低温值作为需冷量的评价标准比较适宜；犹它模式在中需冷量和长需冷量范围内能有效预测休眠的结束，而不适宜低需冷量品种的测定；7．2℃模式不适宜作为需冷量的评价模式。品种的需冷量与叶芽开放和始花期的相关系数分别为0．52和0．58，均达到极显著水平。提出了桃品种需冷量评价的系列标准参照品种。

Estimating Models of the Chilling Requirement for Peach

7．2℃ 、0—7．2℃ and Utah model were used as estimation of the chilling requirement of mole than 450 peach varieties at Zhengzhou in Henan from 1986 to 2001．The results showed that： The date of average temperature in autumn equal to or lower than 7．2℃ was appropriate for the initial date of efective chilling accunlLi—lation，0—7．2℃ mod el could be suitable for predicating efectively rest completion；Utah model performed aCELI—mtely in normal and long chilling requ irement； but 7．2℃ mod el Was inefective． The correlation coeficient of chilling requirement with leaf bud breaking an d initial blooming， were 0．52 an d 0．58 respectively， both of them reached significant levels．Reference pe ach cuhivam for chining requ irement determining were given．