北海道における秋播性コムギ新旧品種きたほなみとホクシンの生育・収量特性の差異

日本作物学会紀事

清水 隆大²  吉村 康弘³  今井 康太²  笠島 真也²  中丸 康夫²  伊藤 博武²  佐藤 三佳子³  高橋 肇¹  神野 裕信³  吉田 穂積² 

[1] 山口大学農学部;東京農業大学生物産業学部;北海道立総合研究機構北見農業試験場

关键词: 秋播性コムギ;    乾物生産;    きたほなみ;    受光量;    多収性;    葉身角度;    葉身窒素含有率;    Winter wheat;    Dry-matter production;    Kitahonami;    Intercepted radiation;    High-yielding ability;    Leaf angle;    Leaf nitrogen content;   

DOI  :  10.1626/jcs.85.155

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

In Hokkaido, a leading winter wheat variety, Kitahonami, shows higher yielding ability than a previous variety, Hokushin. To identify the factors determining the high-yielding ability of Kitahonami, we compared its growth and grain yield performance with those of Hokushin in two growing seasons (2011-12 and 2012-13). The grain yield of Kitahonami was 8% greater than that of Hokushin. This difference was due to a higher number of grains per ear and 1000-grain weight. The high-yielding ability of Kitahonami was attributed to the large sink capacity. At maturity, the total dry weight of Kitahonami was 13% heavier than that of Hokushin. This increased total dry weight was a result of the increased crop growth rate (CGR) from the milk-ripe to maturity stage. In particular, the dry weight of the ear was greatly increased. A strong source activity during the later grain filling phase also contributed to the high-yielding ability of Kitahonami. The nitrogen content of the second and third leaves at the milk-ripe and maturity stages was higher in Kitahonami than in Hokushin. The erect green leaves of Kitahonami probably absorbed radiation more effectively than those of Hokushin, leading to a higher net assimilation rate (NAR) in the later grain filling phase and higher dry-matter production after the milk-ripe stage.

【 授权许可】

Unknown