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对抗寒力不同的苹果品种,用电阻法与直接测定法、电导法进行了对比鉴定,其结果基本一致。但电阻法比直接测定法具有较大的数字幅度,比电导法较为简便适用。 研究了果树枝条R值与温度之间的变化关系,建立了“R图式”。根据“R图式”,论证了鉴定品种抗寒力的适宜范围:在果树生长期为“R图式”的负指数方程区,即在-8～-11℃条件下冷冻处理10小时;在休眠期为细胞膜致害临界点温度以后及负指数方程区,即在-15～-40℃条件下冷冻处理40小时。 对果树不同的生长时期、冷冻温度和冷冻时间等处理,共重复40余次,结果均表现为抗寒力越强R值越大,因此,可根据R值的大小判定果树的抗寒力。处理时期,以休眠期较好,适温幅度大,易于操作。
Different varieties of cold-resistant apple, with the resistance method and the direct determination of conductivity method conducted comparative identification, the results are basically the same. However, the resistance method has a larger digital amplitude than the direct measurement method, which is simpler and easier to apply than the conductivity method. The relationship between R value and temperature of fruit tree branches was studied, and the “R schema” was established. According to the “R diagram”, the suitable range of the cold resistance of the tested varieties is demonstrated: the negative exponential equation area of “R diagram” during the growth period of the fruit tree, that is, the freezing treatment is carried out for 10 hours under the condition of -8 to -11 ℃; The dormant period is the critical point of the cell membrane damage and the area of the negative exponential equation, which is frozen at -15 ~ -40 ℃ for 40 hours. For different growth periods, freezing temperature and freezing time of fruit trees, the results showed that the stronger R value is, the more R value is. Therefore, the cold resistance of fruit trees can be judged according to the value of R value. Processing period, to sleep better, suitable temperature range, easy to operate.