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以人工锻炼条件处理十八种柑桔类型的实生苗。‘纳加米’（Nagami）金桔、假杂种（Satsuma）蜜柑和‘克利帕特尔’（Clepatra）蜜柑为最耐寒的品种;而‘里斯本’（Lisbon）柠檬、墨西哥（Mexican）柠檬柚、‘伦帕’（Rangpur）柠檬柚和‘卡拉曼丁’（Calamondin）金柑杂种为最不耐寒品种。三种蜜柑、一种桔、三种橙和四种葡萄柚耐寒性中等。一般地说,最耐寒的类型有些在白天70°F、夜里50°F,有些在白天60°F夜里40°F温度以及更低的温度进行锻炼;而最不耐寒的类型主要在白天50°F、夜里30°F和白天45°F、夜里26°F的温度进行锻炼。糖的积累与锻炼有关。
Treatment of 18 kinds of citrus seedlings with artificial training conditions. ’Nagami’ kumquat, Satsuma satsuma and ’Clepatra’ mandarin orange are the most hardy varieties; ’Lisbon’ lemon, Mexican lemon pomelo, Rangpur Lemongrass and Calamondin kumquats are the least tolerant varieties. Three kinds of orange, one orange, three oranges and four kinds of grapefruit moderate cold tolerance. In general, the types most resistant to cold are 70 ° F in the daytime, 50 ° F in the night, some in the daytime at 40 ° F at 60 ° F during the day and lower temperatures, while the least tolerant types are predominantly daytime 50 ° F, 30 ° F at night and 45 ° F during the day and 26 ° F at night. Sugar accumulation and exercise related.