• 作者： 黃漢津; 劉大江; 朱德民
• 作者服務機構： 種苗改良繁殖場; 省農業試驗所農藝系; 中興大學糧食作物研究所
• 中文摘要： 取秈稻及?稻品種各二，種植於臺中地區，比較一二期作下產量變異，特別是
  不稔實率變化以了解期作對水稻不稔實率的影響。
  1.臺中地區二期作水稻產量顯著低於一期作，?稻（臺南 5 號、臺農 52 號）係
  由於穗數減少；秈稻（臺中秈3號、烏毛種）則因穗數減少與稔實率低下所致。
  2.水稻稻株內稔實率表現以一次分?為最高，主稈與二次分?居次。二期作秈
  稻不稔實率的增加，係主稈與各次位分?不稔實率普遍增加所造成，並非某一分
  ?單獨增加而致。
  3.水稻稻株內稔實率以低節位分?為高，高節位（10節位以上）稔實率為低。
  二期作秈稻不稔實率的增加，為各節位分?不稔實率普遍增加，並非某一節位之分
  ?不稔實率顯著增加所致。a
• 英文摘要： Field experiments were conductedto compare the distribution of un-filledgrains between the first and secondcrop seasons of 1980 in Taichung area.Four cultiuars, Tainan 5 and Tainung52 (japonica) as well as Taichung Sen3 and Wu Mao-C hung (indica) wereused as material, the results obtainedare summarized as following: 1. Generally, the grain yield of thesecond crop was lower than that of thefirst crop for all tested cultivars. 2. The grain reduction for twojaponica cultivars in the second cropwas mainly due to few panicle number,and to few panicle number and lowerseed setting for two indica cultivars. 3. Un-filled grain for two indicacultivars, Taichung Sen 3 and Wu Mao-Chung, were 19.3 and 11.4% differencebetween two crops respectively. 4. It was observed that the filledgrain was highest for primary tillersfollowed by the main culms and secon-dary tillers in that order. The signif-ioant increase in un-filled grain inTaichung Sen 3 and Wu Mao-Chung inthe second crop was caused jointly bylower seed-setting of all panicle-bearingtillers. Un-filled grain percentage werealso higher for tillers originated fromhigher nodes of the main culm and forspikelets positioned at lower nodes ofpanicle for these two indica cultivarsgrown in the second crop as comparedwith the first crop.
• 中文關鍵字： --
• 英文關鍵字： --