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No.29 (1982/12) >

Title :沖縄地域における柑橘類の生態に関する研究 : 第 9 報 早生温州の着果安定に対する 2,4-D の効果について(農学科)
Title alternative :Studies on the ecology of citrus in the Island of Okinawa. IX. The effect of 2,4-D on fruit set of citrus unshiu ver. praeox Tanaka (Satuma wase)(Department of Agriculture)
Authors :比嘉, 照夫
Authors alternative :Higa, Teruo
Issue Date :1-Dec-1982
Abstract :沖縄地域における早生温州の着果安定を目的とし, 2,4-Dの効果について検討した結果次の諸点が明らかとなった。1,11,3月上旬の2,4-D10∿20ppmの3回散布は冬∿春期の落葉を防止し着果率を著しく増加させる。50ppm以上の濃度では葉が黄化し畸形果の発生が多くなり, 新梢も畸形となる。処理樹が窒素不足となった場合は二次落果期に落葉が多くなるため, 窒素不足にならないようにすることが望ましい。
The purpose of this study was to get the fruit set of citrus unshu (Satsuma wase) using 2,4-D. The results of this study are as follows. 1. Three times treatment of 10-20ppm of 2,4-D early in January, November and March prevented the defoliation during the winter and spring, and increased remarkably the fruit set percentage. 2. At concentrations above 50ppm of 2,4-D, the leaves were etiolated and revealed a number of the malformed fruits, and the current shoot became malformed. 3. In the case of nitrogen defficiency, the defoliation was increased considerably during the second fruit drop, therefore it is desirable to give a suitable quantity of nitrogen.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/4018
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.29 p.1 -5
Appears in Collections:No.29 (1982/12)

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