枣若干品种需冷量测定

Studies on the Chilling Requirement of Chinese Jujube Cultivars

对枣不同品种冬季休眠的阶段性、需冷量进行了测定,结果表明:枣不同品种度过自然休眠的低温需求量不同。从12月10日到翌年1月20日自然休眠结束,之后进入被迫休眠期。主栽品种中梨枣于12月上旬,金丝小枣于1月中旬结束自然休眠。根据≤7.2℃模型、0～7.2℃模型、犹它模型测定枣的低温需求量。供试品种的低温需求量以平均值计算,≤7.2℃模型、0～7.2℃模型与犹它模型分别为1066h、440h和442CU。把犹它模型作为晋中地区枣品种需冷量的低温标准较为合适。供试的24个枣品种的需冷量为399～580CU。

In this paper,the degree of dormancy and the chilling re quirement (CR)of various cultivars were studied.Various cultivars were differ ent in CRs.From10December to20January the buds of Chinese jujube trees fin ished the natural dor-mancy,then came into an enforced dormant period.Lizao and Jinsixiaozao cultivars finished the dormancy on10December and20January respectively.≤7.2℃model,0～7.2℃model and Utah model were used for me asuring CRs of Chinese jujube trees.The average values received by using these 3models for tested cultivars were1066h,440h and442CU respectively.U tah model is suitable to be used for measuring CR of Chinese jujube trees in Jin zhong area.CRs for24tested cultivars were399～588CU by Utah model.