西日本暖地では北海道育成コムギ品種ハルユタカは茎立期あるいは開花期に窒素追肥しても粒重が増加しなかった

日本作物学会紀事

柴田 香織¹  島内 佳奈恵¹  高橋 肇¹  中川 悠子¹  飯山 豪¹ 

[1] 山口大学

关键词: Crop growth rate;    個体群成長速度;    Haruyutaka;    ハルユタカ;    Kernel weight;    粒重;    Net assimilation rate;    純同化率;    Nitrogen topdress;    窒素追肥;    Overluxuriant growth;    過繁茂;    Topdress at anthesis;    開花期追肥;    Triticum aestivum L;    コムギ（Triticum aestivum L.）;   

DOI  :  10.1626/jcs.73.268

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

We attempted to increase the kernel weight of Hokkaido-bred wheat cultivar “Haruyutaka” by increasing the net assimilation rate (NAR) without inducing an over-luxuriant canopy during the ripening period. For this purpose we applied nitrogen as topdressing at jointing in 1999/2000 and at anthesis in 2000/2001, using the Kyushu-bred cultivar “Daichinominori” as a control. However, kernel weight of either cultivar was not increased by the topdressing in either season. In addition, the topdressing in Haruyutaka increased neither the NAR during the ripening period nor the crop growth rate (CGR). On the other hand, the amount of nitrogen in the whole plant increased from anthesis to maturity only in the plants given nitrogen topdressing. The amount of nitrogen in the kernels increased rapidly from the milk ripe stage to maturity in both plots with and without topdressing in both cultivars, and that at maturity accounted for most of the nitrogen in the whole plant. However, the nitrogen topdressing significantly increased the nitrogen content in the leaf blades at the milk ripe stage and that in the kernels at maturity in both cultivars. These results suggested that nitrogen topdressing increased the nitrogen contents in the whole plant, and increased the translocation of nitrogen into the kernel resulting in an increased nitrogen content of kernel. However, kernel weight was not increased by the topdressing; neither was NAR nor CGR. We suppose that this is because the respiration rate in leaves increased due to the over-luxuriant canopy caused by the topdressing, especially in Haruyutaka.

【 授权许可】

Unknown