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柑桔类果树产生最大抗寒力所要求的低温条件依种类和立地条件而异。美国人Yelenosky(1977)所用试材为甜橙及其杂种,锻炼条件是平均气温15℃左右两周,加上10℃左右两周(21.9℃/10℃,昼/夜,两周;且5.5℃/4.4℃,昼/夜,两周)。日本人吉村布二男(1963)以温州蜜柑、夏蜜柑为试材时,采用15～20℃/2～8℃,昼/夜两个月;夜间增加 0℃～-0℃低温50～400小时条件。认为不少于50～110小时零度以下积温配合零上低温作用,锻炼才有效。目前对于一般柑桔类果树抗寒锻炼必需的温度条件还
The cold conditions required for maximum cold hardiness in citrus fruit trees vary by species and site conditions. The test material used by the American Yelenosky (1977) is sweet orange and its hybrids. The exercise conditions are two weeks at an average temperature of about 15 ° C and two weeks at about 10 ° C (21.9 ° C / 10 ° C, day / night, two weeks; ° C / 4.4 ° C, day / night, two weeks). Japanese Yoshimura two men (1963) to Satsuma mandarin, summer mandarin orange as the test material, the use of 15 ~ 20 ℃ / 2 ~ 8 ℃, day / night for two months; night increased 0 ℃ ~ -0 ℃ low temperature of 50 to 400 hours condition. Think not less than 50 ~ 110 hours below zero temperature accumulated with the role of low temperature, exercise was effective. At present the temperature conditions necessary for the general citrus fruit trees cold exercise