Characteristics and Seedling Establishment of Rice Nursling Seedlings

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X
本文フルテキスト
38-01-02.pdf444.43 KB

A “rice nursling seedling” is the youngest stage of rice seedling transplanted by machine in Japan, and is defined as a seedling of 2 to 3 plant age in leaf number. However, changes in morphological and physiological characteristics of the seedling during this stage of development are not fully understood. This study was undertaken to obtain the ideal plant age of rice nursling seedlings which would give excellent seedling establishment. When plant age of rice seedlings was approximately 2.4, substantial photosynthesis occurred and plant length was over 7 cm, which is required for mechanical transplanting. The transplanted nursling seedlings with this age developed depending on the emerging crown roots from the first node, and it was suggested that crown roots from the coleoptilar node played a role in the absorption of water and nutrients just after transplanting. When rice nursling seedlings exceeded the age of 2.6, characters of the seedling degraded, and this was aggravated by high-density seeding. Rice seedlings with plant age of 2.5 showed the highest level of submergence tolerance among rice seedlings with several plant ages. The results suggest that plant ages of 2.3-2.5 are the ideal ages for transplantation of rice nursling seedlings.

刊行年月日
作成者 SASAKI Ryouji
著者キーワード

plant age in leaf number

transplanting

rooting

submergence

公開者 Japan International Research Center for Agricultural Sciences
データ作成日
国立情報学研究所メタデータ主題語彙集(資源タイプ) Journal Article
38
1
開始ページ 7
終了ページ 13
DOI 10.6090/jarq.38.7
権利 Japan International Research Center for Agricultural Sciences
言語 eng