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No.30 (1983/11) >

 
Title :沖縄における 1 期作および 2 期作稲の生育特性(農学科)
Title alternative :characteristics of dry matter production of rice plant in the 1st and 2nd cropping seasons in Okinawa prefecture (Department of Agriculture)
Authors :村山, 盛一
宮里, 清松
野瀬, 昭博
Authors alternative :Murayama, Seiichi
Miyazato, Kiyomatsu
Nose, Akihiro
Issue Date :19-Nov-1983
Abstract :沖縄における1期作および2期作イネの乾物生産特性を明らかにするために本研究を実施した。品種は1930年に台湾から導入し, 50年以上も奨励品種として栽培されてきた台中65号を供試した。結果は次の通りである。1. 栄養生長期間は2期作より1期作が約35日長く, 一方, 登塾期間は2期作が約15日長い。2. 草丈は1期作, 2期作ともに穂揃期まで伸長し, その後の伸長はみられなかった。3. 茎数は全生育期間を通じて2期作より1期作の方が多かった。4. 全乾物重, 茎乾物重は2期作よりも1期作が急速に増大した。5. 全乾物重に対する穂乾物重の割合は1期作では急速に増大し, 収穫期には50%以上に達した。6. CGRは1期作, 2期作ともに出穂直前頃に最大値を示し, 出穂後は急速に減少した。また, CGRは2期作よりも1期作が高い値を示した。7. 2期作の精籾収量は1期作に比べてかなり低くかった。これは1株穂数, 1穂粒数等のほとんど収量構成要素において, 1期作よりも2期作が劣ったことによると思われる。
An expriment was carried out to study the characteristics of dry matter production of rice plant in the 1st and 2nd cropping seasons in Okinawa prefecture. Rice variety used in the experiment was Taichung 65,which is a leading variety cultivated in Okinawa prefecture more than 50 years since it was introduced from Taiwan in 1930. The results obtained are as follows. 1. The vegetative stage in the 1st cropping season was about 35 days longer than that in the 2nd cropping season. On the other hand, the ripening period in the 2nd cropping season was about 15 days longer than that in the 1st cropping season. 2. Plant height in both the 1st and 2nd cropping seasons kept growing until the full heading time, but after that, the height did not grow. 3. Throughout the full growing period, the number of stalks was much larger in the 1st cropping season than in the 2nd cropping season. 4. Total dry matter weight, stalk dry matter weight, and panicle dry matter weight increased more rapidly in the 1st cropping season than in the 2nd cropping season. 5. Percentage of panicle dry matter weight to total dry matter weight increased rapidly in the 1st cropping season, and it reached above 50 Percent at harvest time. In the 2nd cropping season, however, it was under 50 percent at harvest time, since it increased slowly. 6. CGR in both the 1st and 2nd cropping seasons showed a maximum value just before the heading time, but after that it decreased rapidly. On the other hand, CGR was higher in the 1st cropping season than in the 2nd cropping season. 7. Winnowed paddy yield in the 2nd cropping season was very lower than that in the 1st cropping season. It is regarded that this is due to the fact that almost all the yield component characters, namely, panicle number per plant, spikelet number per panicle, and percentage of ripening showed lower values in the 2nd cropping season than in the 1st cropping season.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3986
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.30 p.137 -143
Appears in Collections:No.30 (1983/11)

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