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No.22 (1975/12) >

 
Title :第 II 報 早生温州 C. unshiu var. praeox TANAKA について(沖縄地域における柑橘類の生態に関する研究)(農学部)
Title alternative :II Ecology of C. unshiu var. praeox TANAKA (Studies on the Ecology of Citrus in the Islands of Okinawa) (Department of Agriculture)
Authors :比嘉, 照夫
Authors alternative :Higa, Teruo
Issue Date :1-Dec-1975
Abstract :沖縄地域における早生温州の導入過程や生態についての調査を行なった結果, 次の点が明らかとなった。1.沖縄地域における早生温州は, 1950年以後見本程度に導入され, 本格的な経済栽培は1966年からである。2.年間の新梢発生回数は, 未着果樹の場合, 石垣市で4∿5回, 石川市で3∿4回, 着果樹は両地域とも2∿3回である。その内有効な結果母枝となり得るものは, 未着果樹が石垣市で4回目, 石川市で3回目, 着果樹は両地域とも2回目の新梢である。3.開花最盛期は並年で, 石垣市は3月中旬, 石川市は4月上旬となるが, 冬季の気温や樹の栄養状態により, 10日前後のずれが認められる。4.着果率は, 発蕾から生理落果期までの降雨量によって大きく変動し, 多雨の場合は着果率は著しく低下する。それらの時期は, 石垣市で2月下旬∿4月上旬, 石川市で3月中旬∿4月下旬となっている。5.糖度8度以上, 酸度1.5%以下を基準とする収穫期は, 石垣市で7月中旬∿8月中旬, 石川市で7月下旬∿9月上旬である。
As a result of research on the process of introduction of Citrus unshiu var. praeox TANAKA to Okinawa district and the ecology, the following have been proved. 1. C. u. var. praeox TANAKA was introduced in to Okinawa district as a mere sample in after 1950. Since 1966,however, the citrus has been reguraly planted as an industry. 2. In the case of the trees not bearing fruit, new shoots come out four or five times per year in Ishigaki and Ishikawa cities, while the trees bearing fruit in the both areas have new shoots two or three times per year. Of those new shoots, fourth ones can be bearing shoots the next year without fruit in Ishigaki; the third, in Ishikawa. In the case of the trees with fruit, the second new shoots can be bearing shoots in the both areas. 3. In the normal year, the blooming season falls in mid-March in Ishigaki; early in April in Ishikawa. The season, however, may be reversed about ten day in accordance with the temperature in the winter or the nutritive condition of the trees. 4. The bearing fruit rate is changeable according to the rain fall from the budding time to physiological fruit drop time. The rate considerably drops when it rains much. 5. The havest time, when the fruits picked should have a soluble solid of 8 or more percent and a citric acid of 1.5 or lesser percent, is mid-July to mid-Au-gust in Ishigaki; in Ishikawa; late in July to early in September.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/4323
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.22 p.69 -77
Appears in Collections:No.22 (1975/12)

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