臺灣中部雙期作水田發展冬季裡作之研究(I)早植稻不稔現象之發生
Other Title
Studies on Winter Cropping System for Paddy Field of Central Taiwan Ⅰ. Occurrence of Severe Seed Sterility of Rice by Early Planting
Journal
中華農業研究
Journal Volume
29
Journal Issue
1
Pages
61-65
Date Issued
1980-03-08
Date
1980-03-08
Author(s)
邱善美
S.M. Chiu
Abstract
以早熟稻品種陸奧錦（Mutsunishiki）及中晚熟品種臺農67 號為觀察材料。經比較其生育期間晝夜溫差之結果，認為本期作所導致陸奧錦之不稔現象為夜低溫為主要原因。不稔穀粒之分佈，以穗端部最大，次為中部，基部最少，其稔實率分別為31.7 , 43.7 及62.3 %。此種現象與以稻穗支梗著生部位所調查結果甚為一致，但各次分蘗之稔實率則顯有差異，高節位之分蘗較低節位之分蘗之稔實率有較低之趨勢。農67 號未發生不稔現象。
稻因早植較一般移植者株高較低，二者相差14.3cm ( Mutsunishiki）及9.9 cm （臺農67 號）數亦以早植者優於一般植期者，各品種分別每株增加3.9 穗（Mutsunishiki）及3.0 穗（臺農67 號）。
An early maturing variety Mutsunishiki, and a medium-late variety, Tainung 67 were planted one month earlier than the conventional planting time of first rice crop to explore the possibility of early harvest of rice to be followed by the second crop of rice and the subsequent culture of upland crops during the winter season.
A severe seed sterility occurred in Mutsunishiki, but not in Tainung 67. After recording of day-night temperature changes, it was noticed that the night temperatures was very low during the period of meiosis stage of Mutsunishiki, therefore, it was considered to be the main factor causing the severe seed sterility.
The percent seed setting varied from different parts of a panicle, the upper, middle and lower parts of panicle being 31.7%, 43.7% and 62.3% respectively. A similar trend was also observed for different branches within a panicle. Percent seed setting also varied from tiller to tiller within a hill and the higher the node position of the tiller, the lower the percent seed setting.
The plant height of Mutsunishiki and Tainung 67 shortered to be 14.3cm and 9.9cm due to the early planting, However, the number of tillers was found to be increased.
Publisher
農業試驗所
Type
journal article
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