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一、前言据1986年统计,日本的椪柑栽培面积为2905公顷,主产于鹿儿岛、熊本、高知、宫崎等县,据认为,椪柑栽培理想区域在年平均气温18～20℃的地带。但日本的椪柑栽培区域,除岛屿部外,因积温不足而致露地栽培存在诸多问题,产量呈下降或停滞状态。日本椪柑栽培的突出问题是品种与砧木的
I. Introduction According to the 1986 statistics, Japan’s citrus cultivation area of 2,905 hectares, mainly produced in Kagoshima, Kumamoto, Kochi, Miyazaki and other counties, it is believed that the ideal area for citrus cultivation in the annual average temperature of 18 ~ 20 ℃ zone . However, in Japan’s citrus cultivation area, in addition to the island department, there are many problems with open-field cultivation due to lack of accumulated temperature, and the yield is dropping or stagnating. The prominent problems of Japanese kombu cultivation are variety and rootstock