Differences between Two Spring Wheat Cultivars in Effects of Shadings on Dry Matter Production

Japanese Journal of Crop Science

Koji NAGAO¹  Tadashi TAKAHASHI¹  Kimio NAKASEKO¹ 

关键词: Canopy structure;    可溶性炭水化物;    Dry matter production;    乾物生産;    Nitrogen content;    群落構造;    Shading;    遮光処理;    Spring wheat varieties;    窒素含有率;    Water soluble carbohydrate;    春播コムギ品種;   

DOI  :  10.1626/jcs.68.29

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

This study investigated the effects of shadings (by a cloth with 70% interception) before and after anthesis on dry matter production in a field condition for two spring wheat cultivars whose canopy structures are different. Grain yields were decreased 32-34% by shadings in Norin 61, though only 13-15% lay shadings in Haruyutaka. These were mainly caused by decreases with shadings in total dry weight, which accounted for 27-32% in Norin 61 and 11-13% in Haruyutaka. It was found that Haruyutaka definitely showed less decrease in dry matter production in response to a shortage of solar radiation than Norin 61 did. The nitrogen contents in the second and third leaves at the milk ripe stage were increased by shading before anthesis in Haruyutaka, but not in Norin 61. Furthermore, the daily increases of water soluble carbohydrate in leaves were increased by shading after anthesis in Haruyutaka and decreased by shading in Norin 61. These results suggest that the photosynthesis in a canopy was enhanced after shadings in Haruyutaka, but not in Norin 61.

【 授权许可】

Unknown