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The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus >
No.25 (1978/12) >

Title :第 VI 報 GA 処理による早生温州の隔年結果防止について(沖縄地域における柑橘類の生態に関する研究)(農学科)
Title alternative :VI. Effect of GA on preventing alternate bearing of Wase satuma (C. unshiu var. praeox)(Studies on the Ecology of Citrus in the Islands of Okinawa)(Department of Agriculture)
Authors :比嘉, 照夫
上原, 周夫
小橋川, 共志
Authors alternative :Higa, Teruo
Uehara, Chikao
Kobashigawa, Kiyoshi
Issue Date :1-Dec-1978
Abstract :沖縄地域における早生温州の隔年結果対策の一環として, 収穫後の萌芽促進, 新梢の充実, ならびに次年度の着花や着果におよぼすGAの影響について検討を行なった結果, 次の諸点が明らかとなった。1.GA 50,100,250ppmのいずれの処理区の萌芽率は無処理区の2∿3.5倍に達し, 著しい効果が認められ, 濃度の高い順に, 更には窒素(尿素)の葉面散布を併用した区ほど高くなっている。2.次年度の結果量を予測する有効予備枝数も処理区は無処理区の2∿3倍に達し, 萌芽率と同様に窒素の葉面散布を併用した区ほど多くなっている。3.新葉数の増加率も各処理は無処理の1.8∿2.8倍に達し, 萌芽率とほぼ類似の傾向となっている。4.有効予備枝の次年度における有花節率は, 全区とも87∿100%とかなり高い値いを示し, 実用上, GAの花芽抑制作用の影響は全く認められなかった。5.着果数は, 前年度の有効予備枝数と深い関係にあり, 予備枝数の多い区ほど着果数の増加が認められた。
As one of the method to prevent the alternate bearing of Wase Satsuma (C. unshiu var. praeox) in Okinawa district, this study investgate the effect of GA on promoting of buds sprouting after harvest, maturing of new shoots, flowering and fruits set of the next year. The results obtained are briefly summarized as fallows : 1. The percentage of buds sprouting of each GA treatment by 50,100,250ppm is 2 to 3.5 times of nontreatment. A remarkable effect is by the order of the high concentration of GA. Folia spray of nitrogen (urea) results in higher percentage of buds sprouting. 2. As for number of preliminary shoots that may predict the next harvest, each GA treatment is 2 to 3 times compared with nontreatment. Like the buds sprouting percentage, folia spray of nitrogen reaults in higher percentage of preliminary shoots. 3. As for the increasing rate of new leaves, each treatment is 1.8 to 2.8 times compared with nontreatment. It is apt to show the similar percentage of the buds sprouting. 4. The sprouting node-flower rate of preliminary shoots in the next year shows conciderable high percentage from 87 to 100 in each treatment. In case of the plactical apprication, the influence of controling of flower iniciation of citrus by GA is not recognized at all. 5. The number of the fruit set has a close connection with the preliminary shoots. It is recoginized that the more the preliminary shoots, the more the number of the fruit set.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/4186
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.25 p.89 -95
Appears in Collections:No.25 (1978/12)

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