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连续两年于每年的1月下旬至2月初从田间采集上年秋梢中部叶片为试材,采用室内电导率法对5个沙糖桔品种(系)的抗寒性进行评价。结果表明,根据Logistic方程确定的低温半致死温度(LT50),粤农晚桔为-6.64℃,金葵蜜桔为-6.10℃,粤桔1号为-5.19℃,普通沙糖桔为-5.07℃,华丰甜桔为-4.20℃。即各品种(系)抗寒力由强到弱依次为粤农晚桔>金葵蜜桔>粤桔1号>普通沙糖桔>华丰甜桔,其中,粤桔1号和普通沙糖桔的抗寒力较为接近。
Two consecutive years from the end of January to the beginning of February each year from the field to collect the leaves of the middle autumn last year as the test material, the indoor conductivity method for 5 Saxifraga varieties (lines) of the cold resistance evaluation. The results showed that according to Logistic equation, the lethal temperature at low temperature (LT50) was 6.64 ℃ for Cantaloupe evening mandarin, -6.10 ℃ for sunflower tangerine, -5.19 ℃ for Cantaloupe 1 and -5.07 ℃, Huafeng sweet orange is -4.20 ℃. In other words, the cold-hardiness of all varieties (lines) from strong to weak were YueNongNanJing> Jin Kui Tangerine> YueJing 1> Ordinary Shatin Orange> Huafeng Sweet Orange, among which, YueJing 1 and Ordinary Sacha Cold-resistant orange is more close.